diff --git a/.github/workflows/nightly_macos_apple_silicon.yml b/.github/workflows/nightly_macos_apple_silicon.yml
index 361f0e4c8e2..0dd21d4f04c 100644
--- a/.github/workflows/nightly_macos_apple_silicon.yml
+++ b/.github/workflows/nightly_macos_apple_silicon.yml
@@ -1,5 +1,5 @@
 on:
-#  pull_request:
+  #  pull_request:
   workflow_dispatch:
   schedule:
     - cron: "0 9 * * *"
@@ -58,7 +58,7 @@ jobs:
 
       - name: test with zig platform
         run: |
-          cd ${{ env.RELEASE_FOLDER_NAME }} && ./roc --build-host --suppress-build-host-warning examples/platform-switching/rocLovesZig.roc
+          cd ${{ env.RELEASE_FOLDER_NAME }} && ./roc --build-host --suppress-build-host-warning examples/platform-switching/roc_loves_zig.roc
 
       - name: print short commit SHA
         run: git rev-parse --short "$GITHUB_SHA"
diff --git a/BUILDING_FROM_SOURCE.md b/BUILDING_FROM_SOURCE.md
index 6e4b75168e0..c8a0bbdd5e4 100644
--- a/BUILDING_FROM_SOURCE.md
+++ b/BUILDING_FROM_SOURCE.md
@@ -15,7 +15,7 @@ Or even run it in your local Docker environment [Developing inside a Container](
 
 ## Using Nix
 
-On MacOS and Linux, we highly recommend Using [nix](https://nixos.org/download.html) to quickly install all dependencies necessary to build roc.
+On MacOS and Linux, we highly recommend using [nix](https://nixos.org/download.html) to quickly install all dependencies necessary to build roc.
 
 :warning: If you tried to run `cargo` in the repo folder before installing nix, make sure to execute `cargo clean` first. To prevent you from executing `cargo` outside of nix, tools like [direnv](https://github.com/nix-community/nix-direnv) and [lorri](https://github.com/nix-community/lorri) can put you in a nix shell automatically when you `cd` into the directory.
 
@@ -89,22 +89,6 @@ Alternatively, you can use `cargo test --no-fail-fast` or `cargo test -p specifi
 
 For emitting LLVM IR for debugging purposes, the `--emit-llvm-ir` flag can be used.
 
-### libxcb libraries
-
-You may see an error like this during builds:
-
-```text
-/usr/bin/ld: cannot find -lxcb-render
-/usr/bin/ld: cannot find -lxcb-shape
-/usr/bin/ld: cannot find -lxcb-xfixes
-```
-
-If so, you can fix it like so:
-
-```sh
-sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev
-```
-
 ### libz libzstd libraries
 
 You may see an error like this during builds:
@@ -120,6 +104,15 @@ If so, you can fix it like so:
 sudo apt-get install libz-dev libzstd-dev
 ```
 
+#### Macos zstd not found
+
+If you still hit `ld: library 'zstd' not found` even after doing `brew install zstd z3`,
+add these lines to `.cargo/config.toml`:
+```
+[target.aarch64-apple-darwin]
+rustflags = ["-C", "link-args=-L/opt/homebrew/lib"]
+```
+
 ### Zig
 
 **version: 0.13.0**
diff --git a/build.zig b/build.zig
index 704215a27f4..e0bf7049505 100644
--- a/build.zig
+++ b/build.zig
@@ -9,12 +9,16 @@ pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
+    // Zig unicode library - https://codeberg.org/atman/zg
+    const zg = b.dependency("zg", .{});
+
     const exe = b.addExecutable(.{
         .name = "roc",
         .root_source_file = b.path("src/main.zig"),
         .target = target,
         .optimize = optimize,
     });
+    exe.root_module.addImport("GenCatData", zg.module("GenCatData"));
 
     b.installArtifact(exe);
 
@@ -34,6 +38,7 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
+    all_tests.root_module.addImport("GenCatData", zg.module("GenCatData"));
 
     // Install the test binary so we can run separately
     // ```sh
diff --git a/build.zig.zon b/build.zig.zon
index 78694379d4d..462b8b55d6b 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -7,6 +7,10 @@
             .url = "git+https://github.com/kristoff-it/zig-afl-kit#88c6b71377767c1b8d26979b0adfa12a58d988dd",
             .hash = "1220796f7d2d9a2d4d7f8339ee0b14aa4bf133a15ae9ba39c941cc68e08d5c5ce9a2",
         },
+        .zg = .{
+            .url = "https://codeberg.org/dude_the_builder/zg/archive/v0.13.2.tar.gz",
+            .hash = "122055beff332830a391e9895c044d33b15ea21063779557024b46169fb1984c6e40",
+        },
     },
     .paths = .{
         "build.zig",
diff --git a/ci/basic_release_test.sh b/ci/basic_release_test.sh
index 7a1b2dcc9f0..9e7bc77d930 100755
--- a/ci/basic_release_test.sh
+++ b/ci/basic_release_test.sh
@@ -30,13 +30,13 @@ cd roc_release/*/
 # test rust platform (first prebuild the host)
 # temp disabled
 # examples/platform-switching/rust-platform/build.sh
-# ./roc examples/platform-switching/rocLovesRust.roc
+# ./roc examples/platform-switching/roc_loves_rust.roc
 
 # test zig platform
-./roc --build-host --suppress-build-host-warning examples/platform-switching/rocLovesZig.roc
+./roc --build-host --suppress-build-host-warning examples/platform-switching/roc_loves_zig.roc
 
 # test C platform
-./roc --build-host --suppress-build-host-warning examples/platform-switching/rocLovesC.roc
+./roc --build-host --suppress-build-host-warning examples/platform-switching/roc_loves_c.roc
 
 # test repl
 cd ../../ci/repl_basic_test
diff --git a/ci/package_release.sh b/ci/package_release.sh
index 9e8be9e82dd..28781116331 100755
--- a/ci/package_release.sh
+++ b/ci/package_release.sh
@@ -16,7 +16,7 @@ mv crates/cli/tests/platform-switching $1/examples
 mv examples/README.md $1/examples
 
 # temporary github.com/roc-lang/roc/pull/7231
-rm $1/examples/platform-switching/rocLovesRust.roc
+rm $1/examples/platform-switching/roc_loves_rust.roc
 rm -rf $1/examples/platform-switching/rust-platform
 
 # copy zig builtins
diff --git a/crates/cli/tests/benchmarks/AStar.roc b/crates/cli/tests/benchmarks/AStar.roc
index be0ead6ced2..b45f179d5c3 100644
--- a/crates/cli/tests/benchmarks/AStar.roc
+++ b/crates/cli/tests/benchmarks/AStar.roc
@@ -103,21 +103,21 @@ astar = \cost_fn, move_fn, goal, model ->
 
                 astar(cost_fn, move_fn, goal, model_with_costs)
 
-# takeStep = \moveFn, _goal, model, current ->
-#     modelPopped =
+# take_step = \move_fn, _goal, model, current ->
+#     model_popped =
 #         { model &
-#             openSet: Set.remove model.openSet current,
+#             open_set: Set.remove model.open_set current,
 #             evaluated: Set.insert model.evaluated current,
 #         }
 #
-#     neighbors = moveFn current
+#     neighbors = move_fn current
 #
-#     newNeighbors = Set.difference neighbors modelPopped.evaluated
+#     new_neighbors = Set.difference neighbors model_popped.evaluated
 #
-#     modelWithNeighbors = { modelPopped & openSet: Set.union modelPopped.openSet newNeighbors }
+#     model_with_neighbors = { model_popped & open_set: Set.union model_popped.open_set new_neighbors }
 #
 #     # a lot goes wrong here
-#     modelWithCosts =
-#         Set.walk newNeighbors modelWithNeighbors (\n, m -> updateCost current n m)
+#     model_with_costs =
+#         Set.walk new_neighbors model_with_neighbors (\n, m -> update_cost current n m)
 #
-#     modelWithCosts
+#     model_with_costs
diff --git a/crates/cli/tests/benchmarks/Base64/Decode.roc b/crates/cli/tests/benchmarks/Base64/Decode.roc
index e33e7028e05..e1f678d664f 100644
--- a/crates/cli/tests/benchmarks/Base64/Decode.roc
+++ b/crates/cli/tests/benchmarks/Base64/Decode.roc
@@ -59,7 +59,7 @@ lowest6_bits_mask = 63
 bits_to_chars_help : U32, Int * -> List U8
 bits_to_chars_help = \bits, missing ->
     # The input is 24 bits, which we have to partition into 4 6-bit segments. We achieve this by
-    # shifting to the right by (a multiple of) 6 to remove unwanted bits on the right, then `Num.bitwiseAnd`
+    # shifting to the right by (a multiple of) 6 to remove unwanted bits on the right, then `Num.bitwise_and`
     # with `0b111111` (which is 2^6 - 1 or 63) (so, 6 1s) to remove unwanted bits on the left.
     # any 6-bit number is a valid base64 digit, so this is actually safe
     p =
diff --git a/crates/cli/tests/benchmarks/Base64/Encode.roc b/crates/cli/tests/benchmarks/Base64/Encode.roc
index 9ff3ed469d6..6ecc6fb7983 100644
--- a/crates/cli/tests/benchmarks/Base64/Encode.roc
+++ b/crates/cli/tests/benchmarks/Base64/Encode.roc
@@ -40,7 +40,7 @@ folder = \{ output, accum }, char ->
                     { output, accum: None }
 
 #  SGVs bG8g V29y bGQ=
-# encodeResidual : { output : List ByteEncoder, accum : State } -> List ByteEncoder
+# encode_residual : { output : List ByteEncoder, accum : State } -> List ByteEncoder
 encode_residual = \{ output, accum } ->
     when accum is
         Unreachable(_) -> output
diff --git a/crates/cli/tests/benchmarks/cFold.roc b/crates/cli/tests/benchmarks/c_fold.roc
similarity index 100%
rename from crates/cli/tests/benchmarks/cFold.roc
rename to crates/cli/tests/benchmarks/c_fold.roc
diff --git a/crates/cli/tests/benchmarks/nQueens.roc b/crates/cli/tests/benchmarks/n_queens.roc
similarity index 100%
rename from crates/cli/tests/benchmarks/nQueens.roc
rename to crates/cli/tests/benchmarks/n_queens.roc
diff --git a/crates/cli/tests/benchmarks/quicksortApp.roc b/crates/cli/tests/benchmarks/quicksort_app.roc
similarity index 100%
rename from crates/cli/tests/benchmarks/quicksortApp.roc
rename to crates/cli/tests/benchmarks/quicksort_app.roc
diff --git a/crates/cli/tests/benchmarks/rBTreeCk.roc b/crates/cli/tests/benchmarks/r_b_tree_ck.roc
similarity index 100%
rename from crates/cli/tests/benchmarks/rBTreeCk.roc
rename to crates/cli/tests/benchmarks/r_b_tree_ck.roc
diff --git a/crates/cli/tests/benchmarks/rBTreeInsert.roc b/crates/cli/tests/benchmarks/r_b_tree_insert.roc
similarity index 100%
rename from crates/cli/tests/benchmarks/rBTreeInsert.roc
rename to crates/cli/tests/benchmarks/r_b_tree_insert.roc
diff --git a/crates/cli/tests/benchmarks/testAStar.roc b/crates/cli/tests/benchmarks/test_a_star.roc
similarity index 100%
rename from crates/cli/tests/benchmarks/testAStar.roc
rename to crates/cli/tests/benchmarks/test_a_star.roc
diff --git a/crates/cli/tests/benchmarks/testBase64.roc b/crates/cli/tests/benchmarks/test_base64.roc
similarity index 100%
rename from crates/cli/tests/benchmarks/testBase64.roc
rename to crates/cli/tests/benchmarks/test_base64.roc
diff --git a/crates/cli/tests/cli_tests.rs b/crates/cli/tests/cli_tests.rs
index a4c1953e334..22a32f99ca0 100644
--- a/crates/cli/tests/cli_tests.rs
+++ b/crates/cli/tests/cli_tests.rs
@@ -63,7 +63,7 @@ mod cli_tests {
 
         let cli_build = ExecCli::new(
             roc_cli::CMD_DEV,
-            file_from_root("crates/cli/tests/platform-switching", "rocLovesRust.roc"),
+            file_from_root("crates/cli/tests/platform-switching", "roc_loves_rust.roc"),
         );
 
         let expected_output = "Roc <3 Rust!\n";
@@ -80,7 +80,7 @@ mod cli_tests {
 
         let cli_build = ExecCli::new(
             CMD_BUILD,
-            file_from_root("crates/cli/tests/platform-switching", "rocLovesZig.roc"),
+            file_from_root("crates/cli/tests/platform-switching", "roc_loves_zig.roc"),
         )
         .arg(BUILD_HOST_FLAG)
         .arg(SUPPRESS_BUILD_HOST_WARNING_FLAG);
@@ -106,7 +106,7 @@ mod cli_tests {
             CMD_CHECK,
             file_from_root(
                 "crates/cli/tests/platform-switching",
-                "rocLovesWebAssembly.roc",
+                "roc_loves_web_assembly.roc",
             ),
         );
 
@@ -382,7 +382,7 @@ mod cli_tests {
                 CMD_BUILD,
                 file_from_root(
                     "crates/cli/tests/test-projects/effectful",
-                    "combine-tasks.roc",
+                    "combine_tasks.roc",
                 ),
             );
 
@@ -605,7 +605,7 @@ mod cli_tests {
                 CMD_BUILD,
                 file_from_root(
                     "crates/cli/tests/test-projects/fixtures/transitive-deps",
-                    "direct-one.roc",
+                    "direct_one.roc",
                 ),
             );
 
@@ -629,7 +629,7 @@ mod cli_tests {
                 CMD_BUILD,
                 file_from_root(
                     "crates/cli/tests/test-projects/fixtures/transitive-deps",
-                    "direct-one-and-two.roc",
+                    "direct_one_and_two.roc",
                 ),
             );
 
@@ -653,7 +653,7 @@ mod cli_tests {
                 CMD_BUILD,
                 file_from_root(
                     "crates/cli/tests/test-projects/fixtures/transitive-deps",
-                    "direct-zero.roc",
+                    "direct_zero.roc",
                 ),
             );
 
@@ -815,7 +815,7 @@ mod cli_tests {
                     CMD_BUILD,
                     file_from_root(
                         "crates/cli/tests/test-projects/test-platform-effects-zig/",
-                        "app-stub.roc",
+                        "app_stub.roc",
                     ),
                 )
                 .arg(BUILD_HOST_FLAG)
@@ -841,7 +841,7 @@ mod cli_tests {
 
             let cli_build = ExecCli::new(
                 CMD_BUILD,
-                file_from_root("crates/cli/tests/test-projects/effectful", "print-line.roc"),
+                file_from_root("crates/cli/tests/test-projects/effectful", "print_line.roc"),
             );
 
             let expected_output =
@@ -865,7 +865,7 @@ mod cli_tests {
                 CMD_BUILD,
                 file_from_root(
                     "crates/cli/tests/test-projects/effectful",
-                    "inspect-logging.roc",
+                    "inspect_logging.roc",
                 ),
             );
 
@@ -1202,7 +1202,7 @@ mod cli_tests {
                 Please enter an integer
                 4
             "};
-            test_benchmark("nQueens.roc", expected_output, Some("6"), UseValgrind::Yes);
+            test_benchmark("n_queens.roc", expected_output, Some("6"), UseValgrind::Yes);
         }
 
         #[test]
@@ -1212,7 +1212,7 @@ mod cli_tests {
                 Please enter an integer
                 11 & 11
             "};
-            test_benchmark("cFold.roc", expected_output, Some("3"), UseValgrind::Yes);
+            test_benchmark("c_fold.roc", expected_output, Some("3"), UseValgrind::Yes);
         }
 
         #[test]
@@ -1234,7 +1234,7 @@ mod cli_tests {
                 10
             "};
             test_benchmark(
-                "rBTreeCk.roc",
+                "r_b_tree_ck.roc",
                 expected_output,
                 Some("100"),
                 UseValgrind::Yes,
@@ -1245,17 +1245,22 @@ mod cli_tests {
         #[cfg_attr(windows, ignore)]
         fn rbtree_insert() {
             let expected_output = "Node Black 0 {} Empty Empty\n";
-            test_benchmark("rBTreeInsert.roc", expected_output, None, UseValgrind::Yes);
+            test_benchmark(
+                "r_b_tree_insert.roc",
+                expected_output,
+                None,
+                UseValgrind::Yes,
+            );
         }
 
         #[test]
         #[cfg_attr(windows, ignore)]
         fn astar() {
             if cfg!(feature = "wasm32-cli-run") {
-                eprintln!("WARNING: skipping testing benchmark testAStar.roc because it currently does not work on wasm32 due to dictionaries.");
+                eprintln!("WARNING: skipping testing benchmark test_a_star.roc because it currently does not work on wasm32 due to dictionaries.");
             } else {
                 let expected_output = "True\n";
-                test_benchmark("testAStar.roc", expected_output, None, UseValgrind::Yes);
+                test_benchmark("test_a_star.roc", expected_output, None, UseValgrind::Yes);
             }
         }
 
@@ -1266,7 +1271,7 @@ mod cli_tests {
                 encoded: SGVsbG8gV29ybGQ=
                 decoded: Hello World
             "};
-            test_benchmark("testBase64.roc", expected_output, None, UseValgrind::Yes);
+            test_benchmark("test_base64.roc", expected_output, None, UseValgrind::Yes);
         }
 
         #[test]
@@ -1288,7 +1293,7 @@ mod cli_tests {
         fn quicksort_app() {
             let expected_output = "Please enter an integer\n[0, 1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 6, 6, 8, 9]\n";
             test_benchmark(
-                "quicksortApp.roc",
+                "quicksort_app.roc",
                 expected_output,
                 Some("0"),
                 UseValgrind::Yes,
@@ -1423,7 +1428,7 @@ mod cli_tests {
             CMD_FORMAT,
             file_from_root(
                 "crates/cli/tests/test-projects/fixtures/format",
-                "not-formatted.roc",
+                "not_formatted.roc",
             ),
         )
         .arg(CHECK_FLAG)
@@ -1433,7 +1438,7 @@ mod cli_tests {
 
     #[test]
     fn format_check_folders() {
-        // This fails, because "not-formatted.roc" is present in this folder
+        // This fails, because "not_formatted.roc" is present in this folder
         ExecCli::new(
             CMD_FORMAT,
             dir_from_root("crates/cli/tests/test-projects/fixtures/format"),
diff --git a/crates/cli/tests/platform-switching/README.md b/crates/cli/tests/platform-switching/README.md
index 981b49eb943..5d967092c5d 100644
--- a/crates/cli/tests/platform-switching/README.md
+++ b/crates/cli/tests/platform-switching/README.md
@@ -4,7 +4,7 @@
 To run, `cd` into this directory and run this in your terminal:
 
 ```bash
-roc --build-host --suppress-build-host-warning rocLovesC.roc
+roc --build-host --suppress-build-host-warning roc_loves_c.roc
 ```
 
 ## About these examples
diff --git a/crates/cli/tests/platform-switching/rocLovesC.roc b/crates/cli/tests/platform-switching/roc_loves_c.roc
similarity index 69%
rename from crates/cli/tests/platform-switching/rocLovesC.roc
rename to crates/cli/tests/platform-switching/roc_loves_c.roc
index 70be654a368..7a6b7c4c572 100644
--- a/crates/cli/tests/platform-switching/rocLovesC.roc
+++ b/crates/cli/tests/platform-switching/roc_loves_c.roc
@@ -4,6 +4,6 @@ app [main] { pf: platform "c-platform/main.roc" }
 # ubuntu: sudo apt install build-essential clang
 # fedora: sudo dnf install clang
 
-# run with `roc --build-host --suppress-build-host-warning rocLovesC.roc`
+# run with `roc --build-host --suppress-build-host-warning roc_loves_c.roc`
 
 main = "Roc <3 C!\n"
diff --git a/crates/cli/tests/platform-switching/rocLovesRust.roc b/crates/cli/tests/platform-switching/roc_loves_rust.roc
similarity index 100%
rename from crates/cli/tests/platform-switching/rocLovesRust.roc
rename to crates/cli/tests/platform-switching/roc_loves_rust.roc
diff --git a/crates/cli/tests/platform-switching/rocLovesWebAssembly.roc b/crates/cli/tests/platform-switching/roc_loves_web_assembly.roc
similarity index 100%
rename from crates/cli/tests/platform-switching/rocLovesWebAssembly.roc
rename to crates/cli/tests/platform-switching/roc_loves_web_assembly.roc
diff --git a/crates/cli/tests/platform-switching/rocLovesZig.roc b/crates/cli/tests/platform-switching/roc_loves_zig.roc
similarity index 75%
rename from crates/cli/tests/platform-switching/rocLovesZig.roc
rename to crates/cli/tests/platform-switching/roc_loves_zig.roc
index 448a14b8f91..6b7e2c0e426 100644
--- a/crates/cli/tests/platform-switching/rocLovesZig.roc
+++ b/crates/cli/tests/platform-switching/roc_loves_zig.roc
@@ -5,6 +5,6 @@ app [main] { pf: platform "zig-platform/main.roc" }
 # mkdir glue
 # cp crates/compiler/builtins/bitcode/src/* ./glue
 # cd -
-# roc --build-host --suppress-build-host-warning rocLovesZig.roc
+# roc --build-host --suppress-build-host-warning roc_loves_zig.roc
 
 main = "Roc <3 Zig!\n"
diff --git a/crates/cli/tests/platform-switching/web-assembly-platform/README.md b/crates/cli/tests/platform-switching/web-assembly-platform/README.md
index b9d36b1b6ba..010f7dd5750 100644
--- a/crates/cli/tests/platform-switching/web-assembly-platform/README.md
+++ b/crates/cli/tests/platform-switching/web-assembly-platform/README.md
@@ -4,20 +4,20 @@ To run this website, we first compile the app that uses the Wasm platform:
 
 - If you use the nightly roc release:
 ```bash
-./roc build --target=wasm32 examples/platform-switching/rocLovesWebAssembly.roc
+./roc build --target=wasm32 examples/platform-switching/roc_loves_web_assembly.roc
 ```
 - If you start from the compiler source code:
 ```bash
 # Build roc compiler if you have not done so already
 cargo build
-target/debug/roc build --target=wasm32 examples/platform-switching/rocLovesWebAssembly.roc
+target/debug/roc build --target=wasm32 examples/platform-switching/roc_loves_web_assembly.roc
 ```
 We then move the file:
 ```bash
 # Go to the directory where index.html is
 cd examples/platform-switching/web-assembly-platform/
 # Move the .wasm file so that it's beside index.html
-mv ../rocLovesWebAssembly.wasm .
+mv ../roc_loves_web_assembly.wasm .
 ```
 
 In the directory where index.html is, run any web server on localhost.
diff --git a/crates/cli/tests/platform-switching/web-assembly-platform/host.test.js b/crates/cli/tests/platform-switching/web-assembly-platform/host.test.js
index 0152e80a8de..f1293d02c4a 100644
--- a/crates/cli/tests/platform-switching/web-assembly-platform/host.test.js
+++ b/crates/cli/tests/platform-switching/web-assembly-platform/host.test.js
@@ -15,7 +15,7 @@ global.fetch = (filename) =>
 
 const { roc_web_platform_run } = require("./host");
 
-roc_web_platform_run("./rocLovesWebAssembly.wasm", (string_from_roc) => {
+roc_web_platform_run("./roc_loves_web_assembly.wasm", (string_from_roc) => {
   const expected = "Roc <3 Web Assembly!\n";
   if (string_from_roc !== expected) {
     console.error(`Expected "${expected}", but got "${string_from_roc}"`);
diff --git a/crates/cli/tests/platform-switching/web-assembly-platform/index.html b/crates/cli/tests/platform-switching/web-assembly-platform/index.html
index a664e3469c1..86bb80a5dfd 100644
--- a/crates/cli/tests/platform-switching/web-assembly-platform/index.html
+++ b/crates/cli/tests/platform-switching/web-assembly-platform/index.html
@@ -1,12 +1,14 @@
 <html>
-  <body>
-    <div id="output"></div>
-    <script src="./host.js"></script>
-    <script>
-      const elem = document.getElementById("output");
-      roc_web_platform_run("./rocLovesWebAssembly.wasm", (string_from_roc) => {
-        elem.textContent = string_from_roc;
-      });
-    </script>
-  </body>
+
+<body>
+  <div id="output"></div>
+  <script src="./host.js"></script>
+  <script>
+    const elem = document.getElementById("output");
+    roc_web_platform_run("./roc_loves_web_assembly.wasm", (string_from_roc) => {
+      elem.textContent = string_from_roc;
+    });
+  </script>
+</body>
+
 </html>
diff --git a/crates/cli/tests/snapshots/cli_tests__cli_tests__test_platform_simple_zig__module_params.snap b/crates/cli/tests/snapshots/cli_tests__cli_tests__test_platform_simple_zig__module_params.snap
index cd7fa78e06e..cece42dadf8 100644
--- a/crates/cli/tests/snapshots/cli_tests__cli_tests__test_platform_simple_zig__module_params.snap
+++ b/crates/cli/tests/snapshots/cli_tests__cli_tests__test_platform_simple_zig__module_params.snap
@@ -2,32 +2,32 @@
 source: crates/cli/tests/cli_tests.rs
 expression: cli_dev_out.normalize_stdout_and_stderr()
 ---
-App1.baseUrl: https://api.example.com/one
-App2.baseUrl: http://api.example.com/two
-App3.baseUrl: https://api.example.com/three
-App1.getUser 1: https://api.example.com/one/users/1
-App2.getUser 2: http://api.example.com/two/users/2
-App3.getUser 3: https://api.example.com/three/users/3
-App1.getPost 1: https://api.example.com/one/posts/1
-App2.getPost 2: http://api.example.com/two/posts/2
-App3.getPost 3: https://api.example.com/three/posts/3
-App1.getPosts [1, 2]: ["https://api.example.com/one/posts/1", "https://api.example.com/one/posts/2"]
-App2.getPosts [3, 4]: ["http://api.example.com/two/posts/3", "http://api.example.com/two/posts/4"]
-App2.getPosts [5, 6]: ["http://api.example.com/two/posts/5", "http://api.example.com/two/posts/6"]
-App1.getPostComments 1: https://api.example.com/one/posts/1/comments
-App2.getPostComments 2: http://api.example.com/two/posts/2/comments
-App2.getPostComments 3: http://api.example.com/two/posts/3/comments
-App1.getCompanies [1, 2]: ["https://api.example.com/one/companies/1", "https://api.example.com/one/companies/2"]
-App2.getCompanies [3, 4]: ["http://api.example.com/two/companies/3", "http://api.example.com/two/companies/4"]
-App2.getCompanies [5, 6]: ["http://api.example.com/two/companies/5", "http://api.example.com/two/companies/6"]
-App1.getPostAliased 1: https://api.example.com/one/posts/1
-App2.getPostAliased 2: http://api.example.com/two/posts/2
-App3.getPostAliased 3: https://api.example.com/three/posts/3
-App1.baseUrlAliased: https://api.example.com/one
-App2.baseUrlAliased: http://api.example.com/two
-App3.baseUrlAliased: https://api.example.com/three
-App1.getUserSafe 1: https://api.example.com/one/users/1
-Prod.getUserSafe 2: http://api.example.com/prod_1/users/2?safe=true
-usersApp1: ["https://api.example.com/one/users/1", "https://api.example.com/one/users/2", "https://api.example.com/one/users/3"]
-getUserApp3Nested 3: https://api.example.com/three/users/3
-usersApp3Passed: ["https://api.example.com/three/users/1", "https://api.example.com/three/users/2", "https://api.example.com/three/users/3"]
+App1.base_url: https://api.example.com/one
+App2.base_url: http://api.example.com/two
+App3.base_url: https://api.example.com/three
+App1.get_user 1: https://api.example.com/one/users/1
+App2.get_user 2: http://api.example.com/two/users/2
+App3.get_user 3: https://api.example.com/three/users/3
+App1.get_post 1: https://api.example.com/one/posts/1
+App2.get_post 2: http://api.example.com/two/posts/2
+App3.get_post 3: https://api.example.com/three/posts/3
+App1.get_posts [1, 2]: ["https://api.example.com/one/posts/1", "https://api.example.com/one/posts/2"]
+App2.get_posts [3, 4]: ["http://api.example.com/two/posts/3", "http://api.example.com/two/posts/4"]
+App2.get_posts [5, 6]: ["http://api.example.com/two/posts/5", "http://api.example.com/two/posts/6"]
+App1.get_post_comments 1: https://api.example.com/one/posts/1/comments
+App2.get_post_comments 2: http://api.example.com/two/posts/2/comments
+App2.get_post_comments 3: http://api.example.com/two/posts/3/comments
+App1.get_companies [1, 2]: ["https://api.example.com/one/companies/1", "https://api.example.com/one/companies/2"]
+App2.get_companies [3, 4]: ["http://api.example.com/two/companies/3", "http://api.example.com/two/companies/4"]
+App2.get_companies [5, 6]: ["http://api.example.com/two/companies/5", "http://api.example.com/two/companies/6"]
+App1.get_post_aliased 1: https://api.example.com/one/posts/1
+App2.get_post_aliased 2: http://api.example.com/two/posts/2
+App3.get_post_aliased 3: https://api.example.com/three/posts/3
+App1.base_url_aliased: https://api.example.com/one
+App2.base_url_aliased: http://api.example.com/two
+App3.base_url_aliased: https://api.example.com/three
+App1.get_user_safe 1: https://api.example.com/one/users/1
+Prod.get_user_safe 2: http://api.example.com/prod_1/users/2?safe=true
+users_app1: ["https://api.example.com/one/users/1", "https://api.example.com/one/users/2", "https://api.example.com/one/users/3"]
+get_user_app3_nested 3: https://api.example.com/three/users/3
+users_app3_passed: ["https://api.example.com/three/users/1", "https://api.example.com/three/users/2", "https://api.example.com/three/users/3"]
diff --git a/crates/cli/tests/test-projects/effectful/Community.roc b/crates/cli/tests/test-projects/effectful/Community.roc
index 5fcada82f98..56edb504419 100644
--- a/crates/cli/tests/test-projects/effectful/Community.roc
+++ b/crates/cli/tests/test-projects/effectful/Community.roc
@@ -7,7 +7,7 @@ module [
     walk_friend_names,
 ]
 
-## Datatype representing a community for demonstration purposes in inspect-gui.roc and inspect-logging.roc
+## Datatype representing a community for demonstration purposes in inspect_logging.roc
 
 Community := {
     people : List Person,
diff --git a/crates/cli/tests/test-projects/effectful/combine-tasks.roc b/crates/cli/tests/test-projects/effectful/combine_tasks.roc
similarity index 100%
rename from crates/cli/tests/test-projects/effectful/combine-tasks.roc
rename to crates/cli/tests/test-projects/effectful/combine_tasks.roc
diff --git a/crates/cli/tests/test-projects/effectful/inspect-logging.roc b/crates/cli/tests/test-projects/effectful/inspect_logging.roc
similarity index 100%
rename from crates/cli/tests/test-projects/effectful/inspect-logging.roc
rename to crates/cli/tests/test-projects/effectful/inspect_logging.roc
diff --git a/crates/cli/tests/test-projects/effectful/print-line.roc b/crates/cli/tests/test-projects/effectful/print_line.roc
similarity index 100%
rename from crates/cli/tests/test-projects/effectful/print-line.roc
rename to crates/cli/tests/test-projects/effectful/print_line.roc
diff --git a/crates/cli/tests/test-projects/false-interpreter/Context.roc b/crates/cli/tests/test-projects/false-interpreter/Context.roc
index bc129a7dd7d..35275e12f21 100644
--- a/crates/cli/tests/test-projects/false-interpreter/Context.roc
+++ b/crates/cli/tests/test-projects/false-interpreter/Context.roc
@@ -63,7 +63,7 @@ with! = \path, callback! ->
     File.with_open!(path, \handle ->
         # I cant define scope here and put it in the list in callback. It breaks alias anaysis.
         # Instead I have to inline this.
-        # root_scope = { data: Some handle, index: 0, buf: [], whileInfo: None }
+        # root_scope = { data: Some handle, index: 0, buf: [], while_info: None }
         callback!({ scopes: [{ data: Some(handle), index: 0, buf: [], while_info: None }], state: Executing, stack: [], vars: List.repeat(Number(0), Variable.total_count) }))
 
 # I am pretty sure there is a syntax to destructure and keep a reference to the whole, but Im not sure what it is.
diff --git a/crates/cli/tests/test-projects/false-interpreter/main.roc b/crates/cli/tests/test-projects/false-interpreter/main.roc
index 7ea7128e8bc..5443035593e 100644
--- a/crates/cli/tests/test-projects/false-interpreter/main.roc
+++ b/crates/cli/tests/test-projects/false-interpreter/main.roc
@@ -278,7 +278,7 @@ step_exec_ctx! = \ctx, char ->
                 Ok(a) ->
                     Ok(a)
 
-                # Being explicit with error type is required to stop the need to propogate the error parameters to Context.popStack
+                # Being explicit with error type is required to stop the need to propogate the error parameters to Context.pop_stack
                 Err(EmptyStack) ->
                     Err(EmptyStack)
 
diff --git a/crates/cli/tests/test-projects/fixtures/format/not-formatted.roc b/crates/cli/tests/test-projects/fixtures/format/not_formatted.roc
similarity index 100%
rename from crates/cli/tests/test-projects/fixtures/format/not-formatted.roc
rename to crates/cli/tests/test-projects/fixtures/format/not_formatted.roc
diff --git a/crates/cli/tests/test-projects/fixtures/transitive-deps/direct-one.roc b/crates/cli/tests/test-projects/fixtures/transitive-deps/direct_one.roc
similarity index 100%
rename from crates/cli/tests/test-projects/fixtures/transitive-deps/direct-one.roc
rename to crates/cli/tests/test-projects/fixtures/transitive-deps/direct_one.roc
diff --git a/crates/cli/tests/test-projects/fixtures/transitive-deps/direct-one-and-two.roc b/crates/cli/tests/test-projects/fixtures/transitive-deps/direct_one_and_two.roc
similarity index 100%
rename from crates/cli/tests/test-projects/fixtures/transitive-deps/direct-one-and-two.roc
rename to crates/cli/tests/test-projects/fixtures/transitive-deps/direct_one_and_two.roc
diff --git a/crates/cli/tests/test-projects/fixtures/transitive-deps/direct-zero.roc b/crates/cli/tests/test-projects/fixtures/transitive-deps/direct_zero.roc
similarity index 100%
rename from crates/cli/tests/test-projects/fixtures/transitive-deps/direct-zero.roc
rename to crates/cli/tests/test-projects/fixtures/transitive-deps/direct_zero.roc
diff --git a/crates/cli/tests/test-projects/module_params/Api.roc b/crates/cli/tests/test-projects/module_params/Api.roc
index f8db617be8c..6b5ca2d0a75 100644
--- a/crates/cli/tests/test-projects/module_params/Api.roc
+++ b/crates/cli/tests/test-projects/module_params/Api.roc
@@ -19,7 +19,7 @@ base_url =
 ## function def referencing params
 get_user : U32 -> Str
 get_user = \user_id ->
-    # purposefully not using baseUrl to test top-level fn referencing param
+    # purposefully not using base_url to test top-level fn referencing param
     protocol("api.example.com/${app_id}/users/${Num.to_str(user_id)}")
 
 ## function def referencing top-level value
diff --git a/crates/cli/tests/test-projects/module_params/app.roc b/crates/cli/tests/test-projects/module_params/app.roc
index 763ccd6abc0..dfcd86b7ccc 100644
--- a/crates/cli/tests/test-projects/module_params/app.roc
+++ b/crates/cli/tests/test-projects/module_params/app.roc
@@ -27,33 +27,33 @@ main =
         List.map([1, 2, 3], App3.get_user)
 
     """
-    App1.baseUrl: ${App1.base_url}
-    App2.baseUrl: ${App2.base_url}
-    App3.baseUrl: ${App3.base_url}
-    App1.getUser 1: ${App1.get_user(1)}
-    App2.getUser 2: ${App2.get_user(2)}
-    App3.getUser 3: ${App3.get_user(3)}
-    App1.getPost 1: ${App1.get_post(1)}
-    App2.getPost 2: ${App2.get_post(2)}
-    App3.getPost 3: ${App3.get_post(3)}
-    App1.getPosts [1, 2]: ${Inspect.to_str(App1.get_posts([1, 2]))}
-    App2.getPosts [3, 4]: ${Inspect.to_str(App2.get_posts([3, 4]))}
-    App2.getPosts [5, 6]: ${Inspect.to_str(App2.get_posts([5, 6]))}
-    App1.getPostComments 1: ${App1.get_post_comments(1)}
-    App2.getPostComments 2: ${App2.get_post_comments(2)}
-    App2.getPostComments 3: ${App2.get_post_comments(3)}
-    App1.getCompanies [1, 2]: ${Inspect.to_str(App1.get_companies([1, 2]))}
-    App2.getCompanies [3, 4]: ${Inspect.to_str(App2.get_companies([3, 4]))}
-    App2.getCompanies [5, 6]: ${Inspect.to_str(App2.get_companies([5, 6]))}
-    App1.getPostAliased 1: ${App1.get_post_aliased(1)}
-    App2.getPostAliased 2: ${App2.get_post_aliased(2)}
-    App3.getPostAliased 3: ${App3.get_post_aliased(3)}
-    App1.baseUrlAliased: ${App1.base_url_aliased}
-    App2.baseUrlAliased: ${App2.base_url_aliased}
-    App3.baseUrlAliased: ${App3.base_url_aliased}
-    App1.getUserSafe 1: ${App1.get_user_safe(1)}
-    Prod.getUserSafe 2: ${Prod.get_user_safe(2)}
-    usersApp1: ${Inspect.to_str(users_app1)}
-    getUserApp3Nested 3: ${get_user_app3_nested(3)}
-    usersApp3Passed: ${Inspect.to_str(users_app3_passed)}
+    App1.base_url: ${App1.base_url}
+    App2.base_url: ${App2.base_url}
+    App3.base_url: ${App3.base_url}
+    App1.get_user 1: ${App1.get_user(1)}
+    App2.get_user 2: ${App2.get_user(2)}
+    App3.get_user 3: ${App3.get_user(3)}
+    App1.get_post 1: ${App1.get_post(1)}
+    App2.get_post 2: ${App2.get_post(2)}
+    App3.get_post 3: ${App3.get_post(3)}
+    App1.get_posts [1, 2]: ${Inspect.to_str(App1.get_posts([1, 2]))}
+    App2.get_posts [3, 4]: ${Inspect.to_str(App2.get_posts([3, 4]))}
+    App2.get_posts [5, 6]: ${Inspect.to_str(App2.get_posts([5, 6]))}
+    App1.get_post_comments 1: ${App1.get_post_comments(1)}
+    App2.get_post_comments 2: ${App2.get_post_comments(2)}
+    App2.get_post_comments 3: ${App2.get_post_comments(3)}
+    App1.get_companies [1, 2]: ${Inspect.to_str(App1.get_companies([1, 2]))}
+    App2.get_companies [3, 4]: ${Inspect.to_str(App2.get_companies([3, 4]))}
+    App2.get_companies [5, 6]: ${Inspect.to_str(App2.get_companies([5, 6]))}
+    App1.get_post_aliased 1: ${App1.get_post_aliased(1)}
+    App2.get_post_aliased 2: ${App2.get_post_aliased(2)}
+    App3.get_post_aliased 3: ${App3.get_post_aliased(3)}
+    App1.base_url_aliased: ${App1.base_url_aliased}
+    App2.base_url_aliased: ${App2.base_url_aliased}
+    App3.base_url_aliased: ${App3.base_url_aliased}
+    App1.get_user_safe 1: ${App1.get_user_safe(1)}
+    Prod.get_user_safe 2: ${Prod.get_user_safe(2)}
+    users_app1: ${Inspect.to_str(users_app1)}
+    get_user_app3_nested 3: ${get_user_app3_nested(3)}
+    users_app3_passed: ${Inspect.to_str(users_app3_passed)}
     """
diff --git a/crates/cli/tests/test-projects/test-platform-effects-zig/app-stub.roc b/crates/cli/tests/test-projects/test-platform-effects-zig/app_stub.roc
similarity index 100%
rename from crates/cli/tests/test-projects/test-platform-effects-zig/app-stub.roc
rename to crates/cli/tests/test-projects/test-platform-effects-zig/app_stub.roc
diff --git a/crates/cli_test_utils/src/bench_utils.rs b/crates/cli_test_utils/src/bench_utils.rs
index 0e871966503..fb65e643597 100644
--- a/crates/cli_test_utils/src/bench_utils.rs
+++ b/crates/cli_test_utils/src/bench_utils.rs
@@ -36,7 +36,7 @@ fn bench_cmd<T: Measurement>(
     stdin_str: &'static str,
     bench_group_opt: Option<&mut BenchmarkGroup<T>>,
 ) {
-    // need to modify stack size for cFold benchmark
+    // need to modify stack size for c_fold benchmark
     if exec_cli
         .roc_file_path
         .to_str()
@@ -79,7 +79,7 @@ fn bench_cmd<T: Measurement>(
 
 pub fn bench_nqueens<T: Measurement>(bench_group_opt: Option<&mut BenchmarkGroup<T>>) {
     exec_bench_w_input(
-        &file_from_root("crates/cli/tests/benchmarks", "nQueens.roc"),
+        &file_from_root("crates/cli/tests/benchmarks", "n_queens.roc"),
         "11",
         "Please enter an integer\n2680\n", //2680-14200
         bench_group_opt,
@@ -88,7 +88,7 @@ pub fn bench_nqueens<T: Measurement>(bench_group_opt: Option<&mut BenchmarkGroup
 
 pub fn bench_cfold<T: Measurement>(bench_group_opt: Option<&mut BenchmarkGroup<T>>) {
     exec_bench_w_input(
-        &file_from_root("crates/cli/tests/benchmarks", "cFold.roc"),
+        &file_from_root("crates/cli/tests/benchmarks", "c_fold.roc"),
         "17",
         "Please enter an integer\n396354 & 396354\n",
         bench_group_opt,
@@ -106,7 +106,7 @@ pub fn bench_deriv<T: Measurement>(bench_group_opt: Option<&mut BenchmarkGroup<T
 
 pub fn bench_rbtree_ck<T: Measurement>(bench_group_opt: Option<&mut BenchmarkGroup<T>>) {
     exec_bench_w_input(
-        &file_from_root("crates/cli/tests/benchmarks", "rBTreeCk.roc"),
+        &file_from_root("crates/cli/tests/benchmarks", "r_b_tree_ck.roc"),
         "80000",
         "Please enter an integer\n8000\n",
         bench_group_opt,
@@ -125,7 +125,7 @@ pub fn bench_rbtree_delete<T: Measurement>(bench_group_opt: Option<&mut Benchmar
 
 pub fn bench_quicksort<T: Measurement>(bench_group_opt: Option<&mut BenchmarkGroup<T>>) {
     exec_bench_w_input(
-        &file_from_root("crates/cli/tests/benchmarks", "quicksortApp.roc"),
+        &file_from_root("crates/cli/tests/benchmarks", "quicksort_app.roc"),
         "1", // 1 for sorting large list, 0 for a small list
         "Please enter an integer\n[0, 0, 1, 1, 2, 2, 2, 3, 3, 4, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 9, 10, 10, 11, 11, 12, 13, 13, 14, 14, 14, 15, 15, 15, 16, 16, 18, 18, 19, 19, 19, 20, 21, 21, 21, 21, 22, 23, 23, 23, 25, 26, 27, 27, 28, 28, 28, 29, 29, 29, 29, 30, 31, 32, 33, 34, 35, 35, 35, 36, 36, 36, 37, 38, 38, 39, 39, 39, 39, 39, 39, 40, 40, 41, 42, 42, 42, 42, 42, 43, 43, 44, 46, 47, 47, 47, 48, 50, 51, 51, 52, 52, 52, 53, 54, 54, 55, 55, 55, 56, 57, 57, 58, 58, 58, 58, 58, 59, 59, 60, 60, 61, 62, 63, 63, 63, 63, 64, 65, 65, 65, 66, 66, 66, 66, 67, 67, 68, 69, 69, 70, 70, 71, 71, 71, 72, 72, 73, 73, 73, 74, 75, 75, 75, 76, 78, 79, 79, 80, 81, 81, 82, 82, 83, 83, 84, 84, 86, 86, 87, 87, 88, 88, 88, 89, 89, 90, 90, 90, 91, 92, 92, 92, 93, 93, 93, 94, 95, 95, 96, 97, 98, 99, 100, 100, 101, 102, 102, 102, 104, 104, 105, 106, 106, 106, 106, 106, 106, 107, 107, 108, 108, 108, 109, 109, 109, 109, 110, 112, 112, 112, 113, 113, 113, 113, 113, 114, 115, 117, 117, 117, 118, 119, 119, 119, 120, 120, 121, 123, 124, 125, 125, 126, 126, 126, 126, 127, 129, 131, 131, 131, 131, 131, 131, 131, 132, 133, 133, 134, 134, 134, 135, 135, 135, 135, 135, 137, 138, 138, 138, 139, 139, 140, 141, 142, 142, 142, 144, 144, 145, 145, 145, 147, 147, 147, 147, 148, 149, 149, 149, 150, 150, 151, 151, 151, 151, 153, 155, 156, 159, 160, 160, 160, 161, 161, 162, 162, 162, 162, 162, 162, 163, 163, 163, 163, 163, 163, 164, 164, 164, 164, 164, 165, 165, 165, 165, 165, 166, 166, 166, 166, 166, 167, 167, 167, 167, 168, 169, 170, 170, 170, 170, 172, 172, 172, 173, 173, 173, 174, 175, 176, 177, 177, 178, 178, 178, 178, 179, 179, 180, 180, 181, 181, 182, 183, 183, 185, 186, 186, 186, 186, 186, 186, 186, 187, 187, 187, 188, 188, 188, 190, 190, 190, 190, 190, 192, 193, 194, 194, 194, 195, 195, 196, 197, 198, 198, 198, 199, 199, 199, 200, 200, 201, 201, 201, 204, 205, 205, 205, 207, 207, 207, 208, 208, 208, 208, 210, 210, 210, 210, 211, 211, 213, 214, 214, 214, 218, 218, 218, 218, 218, 218, 219, 221, 222, 223, 223, 223, 224, 224, 224, 224, 224, 224, 224, 225, 226, 226, 226, 226, 226, 227, 227, 228, 228, 229, 229, 229, 229, 230, 230, 230, 230, 232, 233, 233, 234, 235, 236, 236, 237, 237, 238, 240, 240, 242, 242, 243, 244, 246, 247, 247, 247, 247, 248, 248, 248, 249, 249, 249, 249, 249, 250, 250, 250, 251, 251, 252, 252, 253, 255, 255, 256, 256, 256, 257, 257, 257, 258, 258, 258, 258, 258, 259, 259, 260, 260, 260, 261, 261, 261, 262, 263, 265, 265, 266, 267, 267, 267, 268, 268, 268, 270, 270, 270, 271, 271, 273, 274, 274, 274, 275, 277, 277, 279, 279, 280, 281, 281, 282, 283, 283, 285, 286, 288, 288, 289, 289, 290, 290, 290, 290, 290, 291, 291, 291, 291, 292, 292, 292, 293, 294, 294, 295, 295, 295, 295, 295, 298, 298, 301, 301, 301, 302, 302, 303, 304, 305, 305, 306, 307, 307, 308, 308, 309, 309, 309, 309, 310, 310, 311, 311, 311, 312, 313, 313, 313, 314, 315, 316, 316, 316, 316, 317, 318, 318, 319, 319, 319, 320, 321, 321, 322, 322, 322, 322, 323, 323, 323, 324, 324, 324, 325, 326, 326, 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4035, 4035, 4037, 4038, 4038, 4038, 4038, 4038, 4039, 4039, 4039, 4040, 4040, 4040, 4041, 4041, 4041, 4041, 4041, 4041, 4041, 4042, 4042, 4043, 4043, 4043, 4043, 4044, 4044, 4045, 4045, 4045, 4047, 4047, 4048, 4048, 4049, 4050, 4050, 4050, 4051, 4052, 4052, 4053, 4053, 4054, 4055, 4055, 4056, 4056, 4057, 4058, 4058, 4059, 4059, 4060, 4060, 4060, 4061, 4061, 4061, 4062, 4063, 4063, 4064, 4065, 4065, 4065, 4066, 4067, 4068, 4068, 4068, 4069, 4069, 4069, 4070, 4070, 4070, 4071, 4071, 4072, 4072, 4072, 4072, 4072, 4073, 4073, 4074, 4074, 4075, 4076, 4076, 4076, 4076, 4077, 4077, 4078, 4078, 4078, 4080, 4081, 4081, 4082, 4082, 4082, 4083, 4083, 4085, 4085, 4085, 4085, 4085, 4086, 4086, 4086, 4087, 4087, 4087, 4088, 4088, 4089, 4089, 4090, 4090, 4091, 4091, 4092, 4093, 4093, 4093, 4094, 4095, 4096, 4096, 4096, 4097, 4097, 4098, 4099, 4099, 4099, 4099, 4100, 4100, 4101, 4101, 4102, 4102, 4103, 4104, 4104, 4104, 4104, 4104, 4105, 4106, 4106, 4106, 4106, 4107, 4108, 4108, 4109, 4109, 4109, 4109, 4110, 4111, 4112, 4112, 4112, 4112, 4112, 4113, 4113, 4114, 4114, 4114, 4115, 4115, 4116, 4116, 4117, 4117, 4117, 4118, 4118, 4118, 4119, 4119, 4121, 4121, 4122, 4122, 4122, 4123, 4124, 4125, 4125, 4126, 4127, 4129, 4129, 4130, 4131, 4131, 4132, 4132, 4132, 4134, 4134, 4134, 4135, 4135, 4135, 4135, 4135, 4135, 4135, 4135, 4136, 4136, 4136, 4136, 4136, 4136, 4137, 4137, 4137, 4139, 4140, 4140, 4140, 4141, 4141, 4142, 4142, 4142, 4143, 4144, 4144, 4144, 4144, 4145, 4145, 4145, 4145, 4146, 4147, 4147, 4147, 4148, 4148, 4148, 4149, 4149, 4149, 4149, 4149, 4150, 4150, 4151, 4153, 4153, 4154, 4155, 4155, 4156, 4156, 4156, 4157, 4158, 4158, 4159, 4159, 4160, 4160, 4161, 4161, 4161, 4161, 4163, 4163, 4163, 4164, 4164, 4164, 4164, 4165, 4165, 4165, 4166, 4166, 4166, 4167, 4168, 4169, 4170, 4170, 4170, 4171, 4171, 4172, 4173, 4173, 4173, 4173, 4174, 4175, 4175, 4176, 4176, 4176, 4177, 4177, 4177, 4177, 4178, 4178, 4179, 4179, 4179, 4179, 4179, 4179, 4179, 4180, 4180, 4180, 4181, 4181, 4181, 4181, 4182, 4182, 4183, 4184, 4185, 4186, 4187, 4187, 4187, 4188, 4188, 4188, 4189, 4189, 4189, 4189, 4190, 4190, 4190, 4190, 4190, 4191, 4192, 4192, 4192, 4192, 4194, 4195, 4196, 4196, 4196, 4196, 4197, 4197, 4198, 4198, 4198, 4198, 4200, 4200, 4201, 4202, 4202, 4203, 4203, 4204, 4205, 4205, 4207, 4210, 4210, 4210, 4210, 4211, 4211, 4213, 4214, 4214, 4215, 4215, 4215, 4216, 4216, 4216, 4217, 4217, 4218, 4218, 4218, 4218, 4218, 4219, 4220, 4220, 4220, 4221, 4222, 4223, 4223, 4223, 4225, 4225, 4226, 4226, 4227, 4227, 4228, 4228, 4228, 4228, 4229, 4230, 4230, 4232, 4233, 4233, 4233, 4233, 4234, 4235, 4235, 4235, 4235, 4236, 4236, 4236, 4237, 4238, 4238, 4238, 4238, 4238, 4239, 4239, 4239, 4239, 4239, 4240, 4240, 4241, 4243, 4243, 4243, 4243, 4243, 4243, 4244, 4244, 4244, 4244, 4244, 4245, 4245, 4245, 4247, 4247, 4247, 4248, 4248, 4249, 4249, 4249, 4250, 4250, 4250, 4251, 4251, 4252, 4252, 4253, 4253, 4253, 4253, 4253, 4254, 4255, 4255, 4255, 4256, 4256, 4257, 4257, 4257, 4258, 4258, 4258, 4258, 4259, 4259, 4260, 4260, 4261, 4261, 4261, 4261, 4261, 4261, 4262, 4262, 4262, 4263, 4264, 4265, 4265, 4265, 4266, 4267, 4268, 4269, 4269, 4269, 4270, 4270, 4271, 4271, 4271, 4272, 4272, 4273, 4273, 4273, 4273, 4274, 4274, 4274, 4275, 4275, 4277, 4279, 4279, 4280, 4280, 4280, 4281, 4281, 4282, 4282, 4282, 4282, 4282, 4283, 4283, 4283, 4283, 4284, 4285, 4285, 4285, 4285, 4285, 4286, 4286, 4287, 4287, 4287, 4287, 4288, 4289, 4290, 4290, 4291, 4291, 4291, 4292, 4293, 4293, 4293, 4293, 4294, 4294, 4295, 4296, 4297, 4297, 4297, 4297, 4297, 4297, 4298, 4299, 4299, 4299, 4299, 4300, 4300, 4301, 4301, 4302, 4302, 4302, 4302, 4303, 4304, 4305, 4306, 4306, 4306, 4307, 4307, 4308, 4308, 4309, 4309, 4309, 4309, 4310, 4311, 4311, 4312, 4312, 4312, 4312, 4312, 4313, 4314, 4315, 4315, 4316, 4316, 4317, 4317, 4317, 4318, 4318, 4319, 4319, 4320, 4320, 4321, 4322, 4322, 4323, 4325, 4327, 4327, 4327, 4327, 4327, 4328, 4328, 4330, 4330, 4330, 4331, 4331, 4332, 4332, 4334, 4335, 4335, 4336, 4336, 4337, 4337, 4338, 4338, 4338, 4338, 4339, 4339, 4339, 4340, 4340, 4340, 4340, 4340, 4340, 4341, 4341, 4341, 4343, 4343, 4344, 4344, 4344, 4345, 4346, 4347, 4347, 4348, 4348, 4348, 4352, 4353, 4355, 4356, 4356, 4357, 4357, 4358, 4358, 4358, 4358, 4359, 4360, 4360, 4360, 4361, 4361, 4361, 4361, 4362, 4362, 4363, 4363, 4364, 4365, 4365, 4365, 4368, 4370, 4370, 4370, 4371, 4371, 4371, 4372, 4372, 4372, 4372, 4374, 4374, 4374, 4375, 4375, 4376, 4376, 4377, 4377, 4380, 4380, 4381, 4381, 4381, 4382, 4382, 4384, 4386, 4386, 4387, 4387, 4389, 4389, 4389, 4389, 4389, 4389, 4390, 4391, 4391, 4392, 4393, 4393, 4394, 4394, 4394, 4394, 4395, 4395, 4396, 4398, 4398, 4398, 4399, 4400, 4400, 4400, 4401, 4401, 4402, 4403, 4403, 4403, 4404, 4405, 4405, 4405, 4407, 4408, 4408, 4408, 4409, 4410, 4410, 4410, 4410, 4411, 4411, 4412, 4412, 4413, 4413, 4414, 4414, 4414, 4414, 4414, 4415, 4415, 4419, 4419, 4419, 4419, 4420, 4420, 4420, 4421, 4421, 4421, 4421, 4423, 4424, 4425, 4426, 4427, 4427, 4428, 4429, 4429, 4430, 4430, 4430, 4431, 4431, 4431, 4431, 4432, 4432, 4432, 4432, 4432, 4432, 4433, 4433, 4434, 4434, 4435, 4435, 4435, 4435, 4436, 4436, 4436, 4436, 4437, 4437, 4438, 4438, 4438, 4438, 4438, 4439, 4439, 4440, 4440, 4441, 4441, 4442, 4443, 4444, 4444, 4446, 4446, 4447, 4447, 4447, 4448, 4448, 4448, 4449, 4450, 4451, 4452, 4453, 4453, 4454, 4454, 4455, 4455, 4455, 4456, 4456, 4456, 4457, 4457, 4457, 4457, 4457, 4457, 4457, 4457, 4459, 4460, 4460, 4461, 4462, 4462, 4462, 4462, 4465, 4465, 4466, 4467, 4468, 4468, 4469, 4470, 4470, 4471, 4471, 4471, 4471, 4471, 4471, 4471, 4471, 4472, 4472, 4472, 4473, 4473, 4474, 4474, 4474, 4475, 4475, 4476, 4477, 4479, 4479, 4479, 4479, 4481, 4481, 4481, 4481, 4482, 4482, 4482, 4483, 4483, 4484, 4484, 4486, 4487, 4487, 4487, 4487, 4487, 4488, 4488, 4488, 4489, 4491, 4491, 4492, 4492, 4493, 4493, 4494, 4494, 4494, 4494, 4494, 4495, 4495, 4495, 4496, 4496, 4496, 4497, 4498, 4499, 4500, 4500, 4501, 4501, 4503, 4503, 4503, 4504, 4504, 4506, 4509, 4509, 4509, 4509, 4510, 4510, 4511, 4511, 4511, 4512, 4513, 4513, 4514, 4514, 4514, 4515, 4517, 4518, 4521, 4521, 4521, 4521, 4522, 4523, 4523, 4524, 4524, 4525, 4525, 4525, 4525, 4525, 4526, 4526, 4527, 4527, 4528, 4528, 4528, 4529, 4529, 4529, 4529, 4530, 4531, 4532, 4533, 4533, 4534, 4535, 4536, 4536, 4536, 4536, 4537, 4537, 4538, 4539, 4539, 4542, 4542, 4542, 4543, 4543, 4543, 4544, 4544, 4546, 4547, 4547, 4548, 4548, 4549, 4549, 4550, 4550, 4551, 4552, 4552, 4552, 4553, 4553, 4554, 4554, 4554, 4554, 4554, 4555, 4555, 4556, 4556, 4557, 4557, 4558, 4558, 4559, 4559, 4559, 4560, 4560, 4562, 4563, 4563, 4564, 4565, 4566, 4566, 4566, 4567, 4567, 4567, 4567, 4567, 4568, 4568, 4568, 4569, 4569, 4570, 4571, 4572, 4572, 4572, 4572, 4573, 4574, 4574, 4574, 4575, 4575, 4575, 4575, 4575, 4575, 4576, 4576, 4577, 4577, 4578, 4578, 4578, 4579, 4579, 4579, 4579, 4580, 4580, 4580, 4580, 4580, 4581, 4581, 4582, 4583, 4584, 4584, 4586, 4586, 4587, 4588, 4589, 4590, 4590, 4592, 4592, 4592, 4593, 4594, 4594, 4594, 4595, 4595, 4595, 4596, 4597, 4597, 4597, 4598, 4598, 4600, 4600, 4600, 4600, 4601, 4601, 4602, 4602, 4602, 4603, 4604, 4604, 4605, 4605, 4605, 4606, 4607, 4608, 4608, 4608, 4609, 4609, 4609, 4610, 4611, 4611, 4612, 4612, 4614, 4614, 4614, 4614, 4615, 4615, 4616, 4616, 4616, 4616, 4617, 4617, 4617, 4617, 4618, 4618, 4618, 4618, 4620, 4621, 4621, 4621, 4622, 4623, 4623, 4623, 4624, 4624, 4625, 4625, 4626, 4626, 4627, 4627, 4627, 4629, 4629, 4630, 4630, 4631, 4631, 4631, 4631, 4631, 4631, 4632, 4633, 4634, 4634, 4634, 4635, 4635, 4635, 4635, 4636, 4636, 4636, 4636, 4637, 4637, 4638, 4639, 4639, 4640, 4640, 4640, 4641, 4641, 4642, 4643, 4643, 4643, 4644, 4644, 4645, 4646, 4646, 4647, 4648, 4649, 4649, 4649, 4649, 4651, 4651, 4653, 4654, 4655, 4655, 4656, 4656, 4657, 4658, 4658, 4658, 4659, 4659, 4659, 4659, 4659, 4660, 4661, 4662, 4662, 4663, 4663, 4664, 4664, 4665, 4665, 4666, 4666, 4666, 4667, 4667, 4668, 4669, 4669, 4669, 4669, 4670, 4670, 4670, 4671, 4673, 4673, 4674, 4674, 4674, 4674, 4675, 4675, 4675, 4676, 4677, 4678, 4678, 4679, 4679, 4679, 4679, 4680, 4680, 4681, 4681, 4683, 4683, 4683, 4683, 4684, 4684, 4685, 4685, 4686, 4686, 4687, 4687, 4688, 4690, 4690, 4690, 4690, 4691, 4691, 4693, 4693, 4693, 4693, 4693, 4695, 4695, 4697, 4697, 4698, 4699, 4699, 4700, 4700, 4700, 4701, 4701, 4701, 4702, 4703, 4703, 4704, 4704, 4704, 4705, 4705, 4705, 4706, 4707, 4707, 4707, 4708, 4708, 4709, 4709, 4710, 4710, 4710, 4711, 4711, 4712, 4712, 4714, 4715, 4716, 4716, 4717, 4718, 4718, 4718, 4718, 4719, 4719, 4720, 4720, 4720, 4720, 4721, 4721, 4721, 4722, 4722, 4725, 4725, 4726, 4726, 4727, 4728, 4728, 4728, 4728, 4728, 4729, 4729, 4730, 4730, 4731, 4731, 4732, 4732, 4733, 4733, 4733, 4733, 4733, 4734, 4734, 4734, 4734, 4735, 4735, 4735, 4736, 4737, 4738, 4738, 4738, 4738, 4738, 4739, 4739, 4740, 4740, 4741, 4741, 4743, 4743, 4743, 4744, 4744, 4744, 4744, 4744, 4746, 4746, 4746, 4746, 4747, 4747, 4747, 4748, 4748, 4748, 4749, 4749, 4749, 4750, 4751, 4751, 4751, 4752, 4753, 4753, 4753, 4755, 4755, 4756, 4756, 4757, 4757, 4757, 4758, 4758, 4760, 4760, 4760, 4761, 4761, 4762, 4762, 4762, 4763, 4764, 4764, 4765, 4766, 4767, 4767, 4768, 4768, 4769, 4770, 4771, 4771, 4771, 4773, 4774, 4774, 4774, 4774, 4775, 4778, 4779, 4780, 4780, 4780, 4781, 4781, 4782, 4782, 4782, 4783, 4785, 4785, 4786, 4787, 4787, 4787, 4787, 4788, 4788, 4788, 4788, 4788, 4789, 4790, 4790, 4790, 4791, 4791, 4791, 4792, 4792, 4792, 4792, 4792, 4792, 4793, 4794, 4794, 4796, 4796, 4796, 4796, 4797, 4798, 4798, 4799, 4799, 4799, 4799, 4801, 4801, 4802, 4802, 4802, 4803, 4805, 4805, 4808, 4808, 4808, 4810, 4810, 4810, 4811, 4811, 4811, 4811, 4812, 4812, 4813, 4814, 4815, 4815, 4816, 4816, 4816, 4816, 4816, 4817, 4817, 4817, 4818, 4818, 4818, 4819, 4819, 4820, 4822, 4822, 4822, 4822, 4822, 4822, 4823, 4823, 4823, 4824, 4824, 4825, 4826, 4826, 4827, 4827, 4828, 4828, 4828, 4829, 4829, 4830, 4830, 4830, 4831, 4831, 4831, 4832, 4832, 4833, 4834, 4834, 4834, 4834, 4835, 4835, 4835, 4836, 4837, 4838, 4838, 4838, 4838, 4838, 4838, 4839, 4839, 4839, 4839, 4840, 4840, 4841, 4842, 4842, 4842, 4843, 4843, 4843, 4843, 4843, 4844, 4844, 4845, 4846, 4846, 4847, 4847, 4847, 4847, 4847, 4848, 4848, 4849, 4849, 4849, 4849, 4849, 4850, 4850, 4851, 4853, 4853, 4853, 4854, 4854, 4856, 4856, 4857, 4857, 4857, 4858, 4858, 4859, 4859, 4859, 4859, 4860, 4860, 4861, 4862, 4862, 4863, 4863, 4863, 4863, 4864, 4864, 4864, 4864, 4865, 4865, 4866, 4866, 4867, 4867, 4869, 4870, 4870, 4870, 4870, 4870, 4870, 4871, 4871, 4871, 4872, 4873, 4873, 4874, 4874, 4875, 4875, 4876, 4876, 4876, 4876, 4877, 4879, 4879, 4879, 4881, 4882, 4882, 4883, 4883, 4883, 4884, 4884, 4886, 4888, 4888, 4888, 4889, 4890, 4890, 4890, 4891, 4891, 4892, 4892, 4892, 4892, 4893, 4893, 4893, 4894, 4894, 4894, 4894, 4894, 4894, 4895, 4898, 4899, 4899, 4900, 4901, 4901, 4901, 4901, 4902, 4902, 4903, 4904, 4904, 4904, 4904, 4904, 4905, 4906, 4908, 4908, 4909, 4910, 4910, 4911, 4911, 4912, 4912, 4913, 4913, 4914, 4914, 4914, 4915, 4915, 4916, 4917, 4917, 4918, 4918, 4920, 4921, 4921, 4921, 4921, 4922, 4922, 4922, 4922, 4923, 4923, 4924, 4924, 4924, 4925, 4926, 4926, 4926, 4927, 4928, 4928, 4928, 4928, 4928, 4928, 4929, 4930, 4930, 4931, 4932, 4934, 4934, 4935, 4935, 4936, 4936, 4937, 4937, 4937, 4937, 4937, 4938, 4939, 4939, 4939, 4939, 4939, 4939, 4942, 4943, 4943, 4944, 4944, 4944, 4944, 4944, 4945, 4946, 4946, 4946, 4947, 4948, 4948, 4948, 4949, 4949, 4950, 4950, 4950, 4950, 4951, 4951, 4952, 4956, 4956, 4957, 4957, 4957, 4957, 4958, 4960, 4960, 4960, 4961, 4961, 4961, 4962, 4962, 4962, 4963, 4963, 4964, 4964, 4964, 4965, 4966, 4967, 4967, 4968, 4968, 4968, 4971, 4971, 4972, 4972, 4974, 4975, 4975, 4975, 4976, 4976, 4977, 4978, 4978, 4979, 4979, 4979, 4980, 4980, 4980, 4981, 4981, 4981, 4981, 4982, 4982, 4982, 4982, 4982, 4983, 4983, 4983, 4983, 4984, 4985, 4985, 4986, 4986, 4986, 4986, 4987, 4987, 4988, 4989, 4989, 4989, 4990, 4991, 4992, 4992, 4993, 4993, 4994, 4995, 4995, 4996, 4997, 4997, 4997, 4997, 4997, 4998, 4998, 4999, 4999]\n",
         bench_group_opt,
diff --git a/crates/compiler/alias_analysis/src/lib.rs b/crates/compiler/alias_analysis/src/lib.rs
index 925efc3bf29..963be268250 100644
--- a/crates/compiler/alias_analysis/src/lib.rs
+++ b/crates/compiler/alias_analysis/src/lib.rs
@@ -362,7 +362,7 @@ where
         // For now, using solve_trivial to avoid bug with loops.
         // Note: when disabling this, there was not much of a change in performance.
         // Notably, NQueens was about 5% slower. False interpreter was 0-5% faster (depending on input).
-        // cFold and derive saw minor gains ~1.5%. rBTreeCk saw a big gain of ~4%.
+        // c_fold and derive saw minor gains ~1.5%. r_b_tree_ck saw a big gain of ~4%.
         // This feels wrong, morphic should not really be able to slow down code.
         // Likely, noise or the bug and wrong inplace mutation lead to these perf changes.
         // When re-enabling this, we should analysis the perf and inplace mutations of a few apps.
diff --git a/crates/compiler/builtins/roc/Bool.roc b/crates/compiler/builtins/roc/Bool.roc
index 9f326936d7e..ae7047ec482 100644
--- a/crates/compiler/builtins/roc/Bool.roc
+++ b/crates/compiler/builtins/roc/Bool.roc
@@ -3,7 +3,7 @@ module [Bool, Eq, true, false, not, is_eq, is_not_eq]
 ## Defines a type that can be compared for total equality.
 ##
 ## Total equality means that all values of the type can be compared to each
-## other, and two values `a`, `b` are identical if and only if `isEq(a, b)` is
+## other, and two values `a`, `b` are identical if and only if `is_eq(a, b)` is
 ## `Bool.true`.
 ##
 ## Not all types support total equality. For example, [`F32`](../Num#F32) and [`F64`](../Num#F64) can
diff --git a/crates/compiler/builtins/roc/Decode.roc b/crates/compiler/builtins/roc/Decode.roc
index 394ebae1d9f..096005f2aab 100644
--- a/crates/compiler/builtins/roc/Decode.roc
+++ b/crates/compiler/builtins/roc/Decode.roc
@@ -59,7 +59,7 @@ DecodeError : [TooShort]
 ## such as;
 ## ```roc
 ## expect
-##     input = "\"hello\", " |> Str.toUtf8
+##     input = "\"hello\", " |> Str.to_utf8
 ##     actual = Decode.from_bytes_partial(input, Json.json)
 ##     expected = Ok("hello")
 ##
@@ -132,7 +132,7 @@ decode_with = |bytes, @Decoder(decode), fmt| decode(bytes, fmt)
 ## Decode a `List U8` utf-8 bytes and return a [DecodeResult](#DecodeResult)
 ## ```roc
 ## expect
-##     input = "\"hello\", " |> Str.toUtf8
+##     input = "\"hello\", " |> Str.to_utf8
 ##     actual = Decode.from_bytes_partial(input Json.json)
 ##     expected = Ok("hello")
 ##
@@ -146,7 +146,7 @@ from_bytes_partial = |bytes, fmt| decode_with(bytes, decoder, fmt)
 ## remaining returns `Err Leftover (List U8)`.
 ## ```roc
 ## expect
-##     input = "\"hello\", " |> Str.toUtf8
+##     input = "\"hello\", " |> Str.to_utf8
 ##     actual = Decode.from_bytes(input, Json.json)
 ##     expected = Ok("hello")
 ##
diff --git a/crates/compiler/builtins/roc/Num.roc b/crates/compiler/builtins/roc/Num.roc
index 9c08ff8b894..79cc9ee9fde 100644
--- a/crates/compiler/builtins/roc/Num.roc
+++ b/crates/compiler/builtins/roc/Num.roc
@@ -193,7 +193,7 @@ import Result exposing [Result]
 ## have the type `Num *` at first, but usually end up taking on
 ## a more specific type based on how they're used.
 ##
-## For example, in `1 + List.len(myList)`, the `1` has the type `Num *` at first,
+## For example, in `1 + List.len(my_list)`, the `1` has the type `Num *` at first,
 ## but because `List.len` returns a `U64`, the `1` ends up changing from
 ## `Num *` to the more specific `U64`, and the expression as a whole
 ## ends up having the type `U64`.
@@ -345,16 +345,16 @@ Int range : Num (Integer range)
 ## If you don't specify a type, Roc will default to using [Dec] because it's
 ## the least error-prone overall. For example, suppose you write this:
 ## ```roc
-## wasItPrecise = 0.1 + 0.2 == 0.3
+## was_it_precise = 0.1 + 0.2 == 0.3
 ## ```
-## The value of `wasItPrecise` here will be `Bool.true`, because Roc uses [Dec]
+## The value of `was_it_precise` here will be `Bool.true`, because Roc uses [Dec]
 ## by default when there are no types specified.
 ##
 ## In contrast, suppose we use `f32` or `f64` for one of these numbers:
 ## ```roc
-## wasItPrecise = 0.1f64 + 0.2 == 0.3
+## was_it_precise = 0.1f64 + 0.2 == 0.3
 ## ```
-## Here, `wasItPrecise` will be `Bool.false` because the entire calculation will have
+## Here, `was_it_precise` will be `Bool.false` because the entire calculation will have
 ## been done in a base-2 floating point calculation, which causes noticeable
 ## precision loss in this case.
 ##
@@ -726,7 +726,7 @@ abs_diff = |a, b|
 ## Num.neg(0.0)
 ## ```
 ## !! Num.neg is not completely implemented for all types in all contexts, see github.com/roc-lang/roc/issues/6959
-## You can use `\someNum -> 0 - someNum` as a workaround.
+## You can use `\some_num -> 0 - some_num` as a workaround.
 ##
 ## This is safe to use with any [Frac], but it can cause overflow when used with certain [Int] values.
 ##
@@ -904,7 +904,7 @@ log_checked = |x|
 ## > access to hardware-accelerated performance, Roc follows these rules exactly.
 ##
 ## To divide an [Int] and a [Frac], first convert the [Int] to a [Frac] using
-## one of the functions in this module like #toDec.
+## one of the functions in this module like #to_dec.
 ## ```roc
 ## 5.0 / 7.0
 ##
@@ -1125,7 +1125,7 @@ add_wrap : Int range, Int range -> Int range
 ##
 ## This is the same as [Num.add] except for the saturating behavior if the
 ## addition is to overflow.
-## For example, if `x : U8` is 200 and `y : U8` is 100, `addSaturated x y` will
+## For example, if `x : U8` is 200 and `y : U8` is 100, `add_saturated x y` will
 ## yield 255, the maximum value of a `U8`.
 add_saturated : Num a, Num a -> Num a
 
diff --git a/crates/compiler/builtins/roc/Str.roc b/crates/compiler/builtins/roc/Str.roc
index b7b53694702..36e46981fff 100644
--- a/crates/compiler/builtins/roc/Str.roc
+++ b/crates/compiler/builtins/roc/Str.roc
@@ -597,8 +597,8 @@ expect (Str.from_utf8_lossy [82, 0xED, 0xA0, 0xBD, 99]) == "R�c"
 ## expect Str.from_utf16([0xd83d, 0xdc26]) == Ok("🐦")
 ## expect Str.from_utf16([]) == Ok("")
 ## # unpaired surrogates, first and second halves
-## expect Str.from_utf16([82, 0xd83d, 99]) |> Result.isErr
-## expect Str.from_utf16([82, 0xdc96, 99]) |> Result.isErr
+## expect Str.from_utf16([82, 0xd83d, 99]) |> Result.is_err
+## expect Str.from_utf16([82, 0xdc96, 99]) |> Result.is_err
 ## ```
 from_utf16 : List U16 -> Result Str [BadUtf16 { problem : Utf8Problem, index : U64 }]
 from_utf16 = |codeunits|
@@ -700,10 +700,10 @@ expect Str.from_utf16_lossy([82, 0xdc96, 99]) == "R�c"
 ## expect Str.from_utf32([0xb9a, 0xbbf]) == Ok("சி")
 ## expect Str.from_utf32([0x1f426]) == Ok("🐦")
 ## # unpaired surrogates, first and second halves
-## expect Str.from_utf32([82, 0xd83d, 99]) |> Result.isErr
-## expect Str.from_utf32([82, 0xdc96, 99]) |> Result.isErr
+## expect Str.from_utf32([82, 0xd83d, 99]) |> Result.is_err
+## expect Str.from_utf32([82, 0xdc96, 99]) |> Result.is_err
 ## # invalid codepoint
-## expect Str.from_utf32([82, 0x110000, 99]) |> Result.isErr
+## expect Str.from_utf32([82, 0x110000, 99]) |> Result.is_err
 ## ```
 
 from_utf32 : List U32 -> Result Str [BadUtf32 { problem : Utf8Problem, index : U64 }]
diff --git a/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.formatted.roc b/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.formatted.roc
index 87338cba51c..274c54feb1d 100644
--- a/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.formatted.roc
+++ b/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.formatted.roc
@@ -1,4 +1,4 @@
-1P : (
+11 : (
     I,
     s,
     Mw
diff --git a/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.result-ast b/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.result-ast
index 9e7a2bc2806..2cd387da9cc 100644
--- a/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.result-ast
+++ b/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.result-ast
@@ -1,74 +1,79 @@
-@0-21 Defs(
-    Defs {
-        tags: [
-            EitherIndex(2147483648),
-        ],
-        regions: [
-            @0-17,
-        ],
-        space_before: [
-            Slice<roc_parse::ast::CommentOrNewline> { start: 0, length: 0 },
-        ],
-        space_after: [
-            Slice<roc_parse::ast::CommentOrNewline> { start: 0, length: 0 },
-        ],
-        spaces: [],
-        type_defs: [],
-        value_defs: [
-            Annotation(
-                @0-2 SpaceAfter(
-                    NumLiteral(
-                        "1P",
+@0-21 SpaceAfter(
+    Defs(
+        Defs {
+            tags: [
+                EitherIndex(2147483648),
+            ],
+            regions: [
+                @0-17,
+            ],
+            space_before: [
+                Slice<roc_parse::ast::CommentOrNewline> { start: 0, length: 0 },
+            ],
+            space_after: [
+                Slice<roc_parse::ast::CommentOrNewline> { start: 0, length: 0 },
+            ],
+            spaces: [],
+            type_defs: [],
+            value_defs: [
+                Annotation(
+                    @0-2 SpaceAfter(
+                        NumLiteral(
+                            "11",
+                        ),
+                        [
+                            Newline,
+                        ],
                     ),
-                    [
-                        Newline,
-                    ],
-                ),
-                @4-17 Tuple {
-                    elems: [
-                        @5-15 Function(
-                            [
-                                @5-6 Apply(
-                                    "",
-                                    "I",
-                                    [],
-                                ),
-                                @7-8 SpaceAfter(
-                                    BoundVariable(
-                                        "s",
+                    @4-17 Tuple {
+                        elems: [
+                            @5-15 Function(
+                                [
+                                    @5-6 Apply(
+                                        "",
+                                        "I",
+                                        [],
                                     ),
-                                    [
-                                        Newline,
-                                    ],
-                                ),
-                                @10-12 Apply(
-                                    "",
-                                    "Mw",
-                                    [],
+                                    @7-8 SpaceAfter(
+                                        BoundVariable(
+                                            "s",
+                                        ),
+                                        [
+                                            Newline,
+                                        ],
+                                    ),
+                                    @10-12 Apply(
+                                        "",
+                                        "Mw",
+                                        [],
+                                    ),
+                                ],
+                                Pure,
+                                @14-15 BoundVariable(
+                                    "r",
                                 ),
-                            ],
-                            Pure,
-                            @14-15 BoundVariable(
-                                "r",
+                            ),
+                        ],
+                        ext: Some(
+                            @16-17 BoundVariable(
+                                "l",
                             ),
                         ),
-                    ],
-                    ext: Some(
-                        @16-17 BoundVariable(
-                            "l",
-                        ),
-                    ),
-                },
-            ),
-        ],
-    },
-    @18-21 SpaceBefore(
-        Var {
-            module_name: "",
-            ident: "asl",
+                    },
+                ),
+            ],
         },
-        [
-            Newline,
-        ],
+        @18-21 SpaceBefore(
+            Var {
+                module_name: "",
+                ident: "asl",
+            },
+            [
+                Newline,
+            ],
+        ),
     ),
+    [
+        Newline,
+    ],
 )
diff --git a/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.roc b/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.roc
index 2ff60858103..07c30aca37b 100644
--- a/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.roc
+++ b/crates/compiler/test_syntax/tests/snapshots/pass/tuple_function_annotation.expr.roc
@@ -1,4 +1,4 @@
-1P
+11
 :(I,s
 ,Mw->r)l
-asl
\ No newline at end of file
+asl
diff --git a/crates/docs/src/static/styles.css b/crates/docs/src/static/styles.css
index a188e7f0a52..e34bbb034f7 100644
--- a/crates/docs/src/static/styles.css
+++ b/crates/docs/src/static/styles.css
@@ -90,7 +90,7 @@ table tr td {
 }
 
 .entry-name:target {
-  background-color: var(--violet-bg);
+  border: 4px solid var(--violet);
 }
 
 .entry-name a {
diff --git a/crates/glue/src/RustGlue.roc b/crates/glue/src/RustGlue.roc
index 7b01b37d405..0fdd0fdc20e 100644
--- a/crates/glue/src/RustGlue.roc
+++ b/crates/glue/src/RustGlue.roc
@@ -172,7 +172,7 @@ generate_entry_point = \buf, types, name, id ->
     extern_arguments =
         when Types.shape(types, id) is
             Function(roc_fn) ->
-                to_arg_str(roc_fn.args, types, \_argId, shape, index ->
+                to_arg_str(roc_fn.args, types, \_arg_id, shape, index ->
                     index_str = Num.to_str(index)
 
                     if can_derive_copy(types, shape) then
@@ -254,7 +254,7 @@ generate_function = \buf, types, roc_fn ->
 
     extern_call_arguments =
         without_unit =
-            to_arg_str(roc_fn.args, types, \_argId, _shape, index ->
+            to_arg_str(roc_fn.args, types, \_arg_id, _shape, index ->
                 index_str = Num.to_str(index)
 
                 "&arg${index_str}")
@@ -814,7 +814,7 @@ generate_non_recursive_tag_union = \buf, types, id, name, tags, discriminant_siz
             b
     |> generate_roc_refcounted(types, union_type, escaped_name)
 
-generate_non_nullable_unwrapped = \buf, types, name, tag_name, payload, discriminant_size, _discriminant_offset, _null_tagIndex ->
+generate_non_nullable_unwrapped = \buf, types, name, tag_name, payload, discriminant_size, _discriminant_offset, _null_tag_index ->
     escaped_name = escape_kw(name)
     discriminant_name = "discriminant_${escaped_name}"
 
@@ -879,7 +879,7 @@ generate_recursive_tag_union = \buf, types, id, tag_union_name, tags, discrimina
     discriminant_name = "discriminant_${escaped_name}"
     tag_names = List.map(tags, \{ name: n } -> n)
     # self = "(&*self.union_pointer())"
-    # selfMut = "(&mut *self.union_pointer())"
+    # self_mut = "(&mut *self.union_pointer())"
     # other = "(&*other.union_pointer())"
     union_name = "union_${escaped_name}"
 
@@ -1919,9 +1919,9 @@ has_float = \types, type ->
     has_float_help(types, type, Set.empty({}))
 
 has_float_help = \types, type, do_not_recurse ->
-    # TODO: is doNotRecurse problematic? Do we need an updated doNotRecurse for calls up the tree?
+    # TODO: is do_not_recurse problematic? Do we need an updated do_not_recurse for calls up the tree?
     # I think there is a change it really only matters for RecursivePointer, so it may be fine.
-    # Otherwise we need to deal with threading through updates to doNotRecurse
+    # Otherwise we need to deal with threading through updates to do_not_recurse
     when type is
         Num(kind) ->
             when kind is
@@ -2145,9 +2145,9 @@ contains_refcounted = \types, type ->
     contains_refcounted_help(types, type, Set.empty({}))
 
 contains_refcounted_help = \types, type, do_not_recurse ->
-    # TODO: is doNotRecurse problematic? Do we need an updated doNotRecurse for calls up the tree?
+    # TODO: is do_not_recurse problematic? Do we need an updated do_not_recurse for calls up the tree?
     # I think there is a change it really only matters for RecursivePointer, so it may be fine.
-    # Otherwise we need to deal with threading through updates to doNotRecurse
+    # Otherwise we need to deal with threading through updates to do_not_recurse
     when type is
         RocStr | RocList(_) | RocSet(_) | RocDict(_, _) | RocBox(_) | RecursivePointer(_) ->
             Bool.true
diff --git a/crates/packaging/src/cache.rs b/crates/packaging/src/cache.rs
index b412e383c22..27341819235 100644
--- a/crates/packaging/src/cache.rs
+++ b/crates/packaging/src/cache.rs
@@ -54,7 +54,7 @@ fn nixos_error_if_dynamic(url: &str, dest_dir: &Path) {
                         Dynamically linked platforms can't be used on NixOS.\n\n\
                         You can:\n\n\t\
                             - Download the source of the platform and build it locally, like in this example:\n\t  \
-                                https://github.com/roc-lang/roc/blob/main/examples/platform-switching/rocLovesC.roc.\n\t  \
+                                https://github.com/roc-lang/roc/blob/main/examples/platform-switching/roc_loves_c.roc.\n\t  \
                                 For some graphical platforms you may need to use https://github.com/guibou/nixGL.\n\n\t\
                             - Contact the author of the platform to ask them to statically link their platform.\n\t  \
                                 musl can be used to prevent a dynamic dependency on the systems' libc.\n\t  \
diff --git a/src/check/tokenize.zig b/src/check/tokenize.zig
new file mode 100644
index 00000000000..9e88b80cba9
--- /dev/null
+++ b/src/check/tokenize.zig
@@ -0,0 +1,1206 @@
+const std = @import("std");
+
+// Unicode data tables - allows us to identify upper/lowercase letters for non-ASCII characters.
+const GenCatData = @import("GenCatData");
+
+pub const Token = struct {
+    tag: Tag,
+    offset: u32,
+    length: u32,
+
+    pub const Tag = enum(u8) {
+        EndOfFile,
+        Newline,
+
+        // primitives
+        Float,
+        String,
+        SingleQuote,
+
+        // a part of a string interpolation; generally you'll see something like:
+        // StringBegin, OpenCurly, <expr>, CloseCurly StringPart, OpenCurly, <expr>, CloseCurly
+        StringBegin,
+        StringPart,
+
+        // These are not technically valid, but we can have the formatter fix them up.
+        SingleQuoteBegin,
+        SingleQuotePart,
+
+        UpperIdent,
+        LowerIdent,
+        Underscore,
+        DotLowerIdent,
+        DotInt,
+        DotUpperIdent,
+        NoSpaceDotInt,
+        NoSpaceDotLowerIdent,
+        NoSpaceDotUpperIdent,
+
+        NamedUnderscore,
+        OpaqueName,
+        Int,
+
+        OpenRound,
+        CloseRound,
+        OpenSquare,
+        CloseSquare,
+        OpenCurly,
+        CloseCurly,
+
+        OpPlus,
+        OpStar,
+        OpPizza,
+        OpAssign,
+        OpBinaryMinus, // trailing whitespace
+        OpUnaryMinus, // no trailing whitespace
+        OpNotEquals,
+        OpBang,
+        OpAnd,
+        OpAmpersand,
+        OpQuestion,
+        OpOr,
+        OpBar,
+        OpDoubleSlash,
+        OpSlash,
+        OpPercent,
+        OpCaret,
+        OpGreaterThanOrEq,
+        OpGreaterThan,
+        OpLessThanOrEq,
+        OpBackArrow,
+        OpLessThan,
+        OpEquals,
+        OpColonEqual,
+
+        Comma,
+        Dot,
+        DoubleDot,
+        TripleDot,
+        OpColon,
+        OpArrow,
+        OpBackslash,
+
+        // Keywords
+        KwApp,
+        KwAs,
+        KwCrash,
+        KwDbg,
+        KwDebug,
+        KwElse,
+        KwExpect,
+        KwExposes,
+        KwGenerates,
+        KwHas,
+        KwHosted,
+        KwIf,
+        KwImplements,
+        KwImport,
+        KwImports,
+        KwInterface,
+        KwIs,
+        KwModule,
+        KwPackage,
+        KwPackages,
+        KwPlatform,
+        KwProvides,
+        KwRequires,
+        KwThen,
+        KwTo,
+        KwWhen,
+        KwWhere,
+        KwWith,
+    };
+
+    pub const keywords = std.StaticStringMap(Tag).initComptime(.{
+        .{ "app", .KwApp },
+        .{ "as", .KwAs },
+        .{ "crash", .KwCrash },
+        .{ "dbg", .KwDbg },
+        .{ "else", .KwElse },
+        .{ "expect", .KwExpect },
+        .{ "exposes", .KwExposes },
+        .{ "generates", .KwGenerates },
+        .{ "has", .KwHas },
+        .{ "hosted", .KwHosted },
+        .{ "if", .KwIf },
+        .{ "implements", .KwImplements },
+        .{ "import", .KwImport },
+        .{ "imports", .KwImports },
+        .{ "interface", .KwInterface },
+        .{ "is", .KwIs },
+        .{ "module", .KwModule },
+        .{ "package", .KwPackage },
+        .{ "packages", .KwPackages },
+        .{ "platform", .KwPlatform },
+        .{ "provides", .KwProvides },
+        .{ "requires", .KwRequires },
+        .{ "then", .KwThen },
+        .{ "to", .KwTo },
+        .{ "when", .KwWhen },
+        .{ "where", .KwWhere },
+        .{ "with", .KwWith },
+    });
+
+    pub const valid_number_suffixes = std.StaticStringMap(void).initComptime(.{
+        .{ "dec", .{} },
+        .{ "i128", .{} },
+        .{ "i16", .{} },
+        .{ "i32", .{} },
+        .{ "i64", .{} },
+        .{ "i8", .{} },
+        .{ "nat", .{} },
+        .{ "u128", .{} },
+        .{ "u16", .{} },
+        .{ "u32", .{} },
+        .{ "u64", .{} },
+        .{ "u8", .{} },
+    });
+
+    pub fn isKeyword(tok: Tag) bool {
+        return switch (tok) {
+            .KwApp,
+            .KwAs,
+            .KwCrash,
+            .KwDbg,
+            .KwElse,
+            .KwExpect,
+            .KwExpectFx,
+            .KwExposes,
+            .KwGenerates,
+            .KwHas,
+            .KwHosted,
+            .KwIf,
+            .KwImplements,
+            .KwImport,
+            .KwImports,
+            .KwInterface,
+            .KwIs,
+            .KwPackage,
+            .KwPackages,
+            .KwPlatform,
+            .KwProvides,
+            .KwRequires,
+            .KwThen,
+            .KwTo,
+            .KwWhen,
+            .KwWhere,
+            .KwWith,
+            => true,
+            else => false,
+        };
+    }
+};
+
+/// The buffer that accumulates tokens.
+pub const TokenizedBuffer = struct {
+    allocator: std.mem.Allocator,
+    tokens: std.MultiArrayList(Token),
+
+    pub fn init(allocator: std.mem.Allocator) !TokenizedBuffer {
+        return TokenizedBuffer{
+            .allocator = allocator,
+            .tokens = std.MultiArrayList(Token){},
+        };
+    }
+
+    pub fn deinit(self: *TokenizedBuffer) void {
+        self.tokens.deinit(self.allocator);
+    }
+
+    /// Pushes a token with the given tag, token offset, and length.
+    pub fn pushToken(self: *TokenizedBuffer, tag: Token.Tag, tok_offset: u32, tok_length: u32) !void {
+        try self.tokens.append(self.allocator, .{
+            .tag = tag,
+            .offset = tok_offset,
+            .length = tok_length,
+        });
+    }
+
+    pub fn pushNewline(self: *TokenizedBuffer, indent: u32) !void {
+        try self.tokens.append(self.allocator, .{
+            .tag = .Newline,
+            .offset = indent, // store the indent in the offset field
+            .length = 0,
+        });
+    }
+
+    /// Returns the offset of the token at index `idx`.
+    pub fn offset(self: *TokenizedBuffer, idx: u32) u32 {
+        // newline tokens don't have offsets - that field is used to store the indent.
+        std.debug.assert(self.tokens.items(.tag) != .Newline);
+        return self.tokens.items(.offset)[@intCast(idx)];
+    }
+};
+
+pub const Comment = struct {
+    begin: usize,
+    end: usize,
+};
+
+const Unicode = struct {
+    tag: Tag,
+    length: u32,
+
+    const Tag = enum {
+        LetterUpper,
+        LetterNotUpper,
+        Digit,
+        Other,
+        Invalid,
+    };
+};
+
+pub const Diagnostic = struct {
+    tag: Tag,
+    begin: u32,
+    end: u32,
+
+    pub const Tag = enum {
+        MisplacedCarriageReturn,
+        AsciiControl,
+        LeadingZero,
+        UnknownToken,
+        OpaqueNameWithoutName,
+        UppercaseBase,
+        InvalidUnicodeEscapeSequence,
+        InvalidEscapeSequence,
+        UnclosedString,
+        UnclosedSingleQuote,
+        BadNumberSuffix,
+        OverClosedBrace,
+        MismatchedBrace,
+    };
+};
+
+/// The cursor is our current position in the input text, and it collects messages.
+/// Note that instead of allocating its own message list, the caller must pass in a pre-allocated
+/// slice of Message. The field `message_count` tracks how many messages have been written.
+/// This can grow beyond the length of the slice, and if so, it means there are more messages
+/// than the caller has allocated space for. The caller can either ignore these messages or
+/// allocate a larger slice and tokenize again.
+pub const Cursor = struct {
+    buf: []const u8,
+    pos: u32,
+    messages: []Diagnostic,
+    message_count: usize,
+    gc: *GenCatData,
+    tab_width: u8 = 4, // TODO: make this configurable
+
+    /// Initialize a Cursor with the given input buffer and a pre-allocated messages slice.
+    pub fn init(buf: []const u8, messages: []Diagnostic, gc: *GenCatData) Cursor {
+        return Cursor{
+            .buf = buf,
+            .pos = 0,
+            .messages = messages,
+            .message_count = 0,
+            .gc = gc,
+        };
+    }
+
+    fn pushMessageHere(self: *Cursor, tag: Diagnostic.Tag) void {
+        self.pushMessage(tag, self.pos, self.pos);
+    }
+
+    fn pushMessage(self: *Cursor, tag: Diagnostic.Tag, begin: u32, end: u32) void {
+        if (self.message_count < self.messages.len) {
+            self.messages[self.message_count] = .{
+                .tag = tag,
+                .begin = begin,
+                .end = end,
+            };
+        }
+        self.message_count += 1;
+    }
+
+    /// Returns the current byte, or null if at the end.
+    pub fn peek(self: *Cursor) ?u8 {
+        if (self.pos < self.buf.len) {
+            return self.buf[self.pos];
+        }
+        return null;
+    }
+
+    /// Returns the byte at the given lookahead offset.
+    pub fn peekAt(self: *Cursor, lookahead: usize) ?u8 {
+        if (self.pos + lookahead < self.buf.len) {
+            return self.buf[self.pos + lookahead];
+        }
+        return null;
+    }
+
+    pub fn isPeekedCharInRange(self: *Cursor, lookahead: usize, start: u8, end: u8) bool {
+        const c = self.peekAt(lookahead);
+        return c != null and c >= start and c <= end;
+    }
+
+    /// Requires that the next byte is `ch`, otherwise pushes a message.
+    pub fn require(self: *Cursor, ch: u8, tag: Diagnostic.Tag) void {
+        if (self.peek() == ch) {
+            self.pos += 1;
+        } else {
+            self.pushMessageHere(tag);
+        }
+    }
+
+    /// Chomps “trivia” (whitespace, comments, etc.) and returns an optional indent.
+    /// If the chomped trivia includes a newline, returns the indent of the next (real) line.
+    /// Otherwise, returns null.
+    pub fn chompTrivia(self: *Cursor) ?u16 {
+        var sawNewline = false;
+        var indent: u16 = 0;
+
+        while (self.pos < self.buf.len) {
+            const b = self.buf[self.pos];
+            if (b == ' ') {
+                self.pos += 1;
+                if (sawNewline) indent += 1;
+            } else if (b == '\t') {
+                self.pos += 1;
+                if (sawNewline) {
+                    // round up to the next tab stop
+                    indent = (indent + self.tab_width) & ~(self.tab_width - 1);
+                }
+            } else if (b == '\n') {
+                self.pos += 1;
+                sawNewline = true;
+                indent = 0;
+            } else if (b == '\r') {
+                self.pos += 1;
+                sawNewline = true;
+                indent = 0;
+                if (self.pos < self.buf.len and self.buf[self.pos] == '\n') {
+                    self.pos += 1;
+                } else {
+                    self.pushMessageHere(.MisplacedCarriageReturn);
+                }
+            } else if (b == '#') {
+                self.pos += 1;
+                while (self.pos < self.buf.len and self.buf[self.pos] != '\n') {
+                    self.pos += 1;
+                }
+            } else if (b >= 0 and b <= 31) {
+                self.pushMessageHere(.AsciiControl);
+                self.pos += 1;
+            } else {
+                break;
+            }
+        }
+        if (sawNewline) return indent;
+        return null;
+    }
+
+    fn maybeMessageForUppercaseBase(self: *Cursor, b: u8) void {
+        if (b == 'X' or b == 'O' or b == 'B') {
+            self.pushMessageHere(.UppercaseBase);
+        }
+    }
+
+    /// Decodes a Unicode character starting at `self.pos` and returns its category.
+    /// Note this assumes the caller has already peek'd the first byte.
+    pub fn decodeUnicode(self: *Cursor, first_byte: u8) Unicode {
+        std.debug.assert(first_byte == self.buf[self.pos]);
+        const len3 = std.unicode.utf8ByteSequenceLength(first_byte) catch {
+            return .{ .tag = .Invalid, .length = 1 };
+        };
+        const len: u32 = @intCast(len3);
+        const utf8_char = std.unicode.utf8Decode(self.buf[self.pos .. self.pos + len]) catch {
+            return .{ .tag = .Invalid, .length = len };
+        };
+        switch (self.gc.gc(utf8_char)) {
+            .Lu, .Lt => return .{ .tag = .LetterUpper, .length = len },
+            .Ll, .Lm, .Lo => return .{ .tag = .LetterNotUpper, .length = len },
+            .Nd, .Nl, .No => return .{ .tag = .Digit, .length = len },
+            else => return .{ .tag = .Other, .length = len },
+        }
+    }
+
+    pub fn chompNumber(self: *Cursor, initialDigit: u8) Token.Tag {
+        // Consume the initial digit.
+        std.debug.assert(initialDigit == self.buf[self.pos]);
+        self.pos += 1;
+
+        var tok: Token.Tag = undefined;
+        if (initialDigit == '0') {
+            while (true) {
+                const c = self.peek() orelse 0;
+                switch (c) {
+                    'x', 'X' => {
+                        maybeMessageForUppercaseBase(self, c);
+                        self.pos += 1;
+                        self.chompIntegerBase16();
+                        self.chompNumberSuffix();
+                        tok = .Int;
+                        break;
+                    },
+                    'o', 'O' => {
+                        maybeMessageForUppercaseBase(self, c);
+                        self.pos += 1;
+                        self.chompIntegerBase8();
+                        self.chompNumberSuffix();
+                        tok = .Int;
+                        break;
+                    },
+                    'b', 'B' => {
+                        maybeMessageForUppercaseBase(self, c);
+                        self.pos += 1;
+                        self.chompIntegerBase2();
+                        self.chompNumberSuffix();
+                        tok = .Int;
+                        break;
+                    },
+                    '0'...'9' => {
+                        self.pushMessageHere(.LeadingZero);
+                        _ = self.chompNumberBase10();
+                        self.chompNumberSuffix();
+                        tok = .Int;
+                        break;
+                    },
+                    '_' => {
+                        self.pos += 1;
+                        continue;
+                    },
+                    '.' => {
+                        self.pos += 1;
+                        _ = self.chompIntegerBase10();
+                        tok = .Float;
+                        _ = self.chompExponent();
+                        break;
+                    },
+                    else => {
+                        tok = .Int;
+                        break;
+                    },
+                }
+            }
+        } else {
+            _ = self.chompNumberBase10();
+            self.chompNumberSuffix();
+            tok = .Int;
+        }
+        return tok;
+    }
+
+    pub fn chompExponent(self: *Cursor) bool {
+        if (self.peek() orelse 0 == 'e' or self.peek() orelse 0 == 'E') {
+            self.pos += 1;
+            // Optional sign
+            if (self.peek() orelse 0 == '+' or self.peek() orelse 0 == '-') {
+                self.pos += 1;
+            }
+            self.chompIntegerBase10();
+            return true;
+        }
+        return false;
+    }
+
+    pub fn chompNumberSuffix(self: *Cursor) void {
+        if (self.peek() == null or !std.ascii.isAlphabetic(self.peek() orelse 0)) {
+            return;
+        }
+        const start = self.pos;
+        var pos = self.pos + 1;
+        while (pos < self.buf.len) : (pos += 1) {
+            const c = self.buf[pos];
+            if (std.ascii.isAlphabetic(c) or std.ascii.isDigit(c)) {
+                // continue advancing
+            } else {
+                break;
+            }
+        }
+        const suffix = self.buf[start..pos];
+        if (Token.valid_number_suffixes.get(suffix) == null) {
+            self.pushMessageHere(.BadNumberSuffix);
+        }
+        self.pos = pos;
+    }
+
+    pub fn chompNumberBase10(self: *Cursor) Token.Tag {
+        self.chompIntegerBase10();
+        var token_type: Token.Tag = .Int;
+        if (self.peek() orelse 0 == '.') {
+            self.pos += 1;
+            self.chompIntegerBase10();
+            token_type = .Float;
+        }
+        if (self.chompExponent()) {
+            token_type = .Float;
+        }
+        return token_type;
+    }
+
+    pub fn chompIntegerBase10(self: *Cursor) void {
+        while (self.peek()) |c| {
+            if (c >= '0' and c <= '9') {
+                self.pos += 1;
+            } else if (c == '_') {
+                self.pos += 1;
+            } else {
+                break;
+            }
+        }
+    }
+
+    pub fn chompIntegerBase16(self: *Cursor) void {
+        while (self.peek()) |c| {
+            if ((c >= '0' and c <= '9') or (c >= 'a' and c <= 'f') or (c >= 'A' and c <= 'F')) {
+                self.pos += 1;
+            } else if (c == '_') {
+                self.pos += 1;
+            } else {
+                break;
+            }
+        }
+    }
+
+    pub fn chompIntegerBase8(self: *Cursor) void {
+        while (self.peek()) |c| {
+            if (c >= '0' and c <= '7') {
+                self.pos += 1;
+            } else if (c == '_') {
+                self.pos += 1;
+            } else {
+                break;
+            }
+        }
+    }
+
+    pub fn chompIntegerBase2(self: *Cursor) void {
+        while (self.peek()) |c| {
+            if (c == '0' or c == '1') {
+                self.pos += 1;
+            } else if (c == '_') {
+                self.pos += 1;
+            } else {
+                break;
+            }
+        }
+    }
+
+    /// Chomps an identifier starting with a lowercase letter.
+    /// Also checks if the resulting identifier is a keyword.
+    /// Returns the token type - LowerIdent or Kw*
+    pub fn chompIdentLower(self: *Cursor) Token.Tag {
+        const start = self.pos;
+        _ = self.chompIdentGeneral();
+        const ident = self.buf[start..self.pos];
+        const kw = Token.keywords.get(ident);
+        return kw orelse .LowerIdent;
+    }
+
+    /// Chomps a general identifier - either upper or lower case.
+    /// Doesn't check if the identifier is a keyword, since we assume the caller already
+    /// determined that was impossible (e.g. because the first character was uppercase),
+    /// or otherwise not relevant.
+    pub fn chompIdentGeneral(self: *Cursor) void {
+        while (self.pos < self.buf.len) {
+            const c = self.buf[self.pos];
+            if ((c >= 'a' and c <= 'z') or (c >= 'A' and c <= 'Z') or (c >= '0' and c <= '9') or c == '_') {
+                self.pos += 1;
+            } else {
+                const info = self.decodeUnicode(c);
+                if (info.tag != .Other and info.tag != .Invalid) {
+                    self.pos += info.length;
+                } else {
+                    break;
+                }
+            }
+        }
+    }
+
+    pub fn chompInteger(self: *Cursor) void {
+        while (self.pos < self.buf.len) {
+            const c = self.buf[self.pos];
+            if (c >= '0' and c <= '9') {
+                self.pos += 1;
+            } else {
+                break;
+            }
+        }
+    }
+};
+
+/// The output of the tokenizer.
+pub const TokenOutput = struct {
+    tokens: TokenizedBuffer,
+    messages: []Diagnostic,
+    extra_messages_dropped: usize,
+};
+
+const BraceKind = enum {
+    Round,
+    Square,
+    Curly,
+    StringInterpolation,
+    StringInterpolationMultiline,
+    SingleQuoteInterpolation,
+    SingleQuoteInterpolationMultiline,
+};
+
+/// The tokenizer that uses a Cursor and produces a TokenizedBuffer.
+pub const Tokenizer = struct {
+    cursor: Cursor,
+    output: TokenizedBuffer,
+    stack: std.ArrayList(BraceKind),
+
+    /// Creates a new Tokenizer.
+    /// Note that the caller must also provide a pre-allocated messages buffer.
+    pub fn init(text: []const u8, messages: []Diagnostic, gc: *GenCatData, allocator: std.mem.Allocator) !Tokenizer {
+        const cursor = Cursor.init(text, messages, gc);
+        const output = try TokenizedBuffer.init(allocator);
+        return Tokenizer{
+            .cursor = cursor,
+            .output = output,
+            .stack = std.ArrayList(BraceKind).init(allocator),
+        };
+    }
+
+    pub fn deinit(self: *Tokenizer) void {
+        self.output.deinit();
+        self.stack.deinit();
+    }
+
+    pub fn finish_and_deinit(self: Tokenizer) TokenOutput {
+        self.stack.deinit();
+        const actual_message_count = @min(self.cursor.message_count, self.cursor.messages.len);
+        return .{
+            .tokens = self.output,
+            .messages = self.cursor.messages[0..actual_message_count],
+            .extra_messages_dropped = self.cursor.message_count - actual_message_count,
+        };
+    }
+
+    fn pushToken(self: *Tokenizer, tag: Token.Tag, start: u32) !void {
+        const len = self.cursor.pos - start;
+        try self.output.pushToken(tag, start, len);
+    }
+
+    fn consumeBraceCloseAndContinueStringInterp(self: *Tokenizer, brace: BraceKind) !void {
+        std.debug.assert(self.cursor.peek() == '}' or self.cursor.peek() == ']' or self.cursor.peek() == ')');
+        if (self.stack.items.len == 0) {
+            self.cursor.pushMessageHere(.OverClosedBrace);
+            self.cursor.pos += 1;
+            return;
+        }
+        const last = self.stack.items[self.stack.items.len - 1];
+        if (last == brace) {
+            self.stack.items = self.stack.items[0 .. self.stack.items.len - 1];
+        } else {
+            self.cursor.pushMessageHere(.MismatchedBrace);
+        }
+        self.cursor.pos += 1;
+        const start = self.cursor.pos;
+        if (self.stack.items.len > 0) {
+            const brace_kind = self.stack.items[self.stack.items.len - 1];
+            const term: u8 = switch (brace_kind) {
+                .StringInterpolation, .StringInterpolationMultiline => '"',
+                .SingleQuoteInterpolation, .SingleQuoteInterpolationMultiline => '\'',
+                else => return,
+            };
+            const kind: StringKind = switch (brace_kind) {
+                .StringInterpolationMultiline, .SingleQuoteInterpolationMultiline => .multi_line,
+                else => .single_line,
+            };
+            _ = self.stack.pop();
+            const tok = try self.tokenizeStringLikeLiteralBody(.after_interpolation, kind, term, start);
+            try self.output.pushToken(tok, start, self.cursor.pos - start);
+        }
+    }
+
+    /// The main tokenize loop. This loops over the whole input buffer, tokenizing as it goes.
+    pub fn tokenize(self: *Tokenizer) !void {
+        var sawWhitespace: bool = true;
+        while (self.cursor.pos < self.cursor.buf.len) {
+            const start = self.cursor.pos;
+            const sp = sawWhitespace;
+            sawWhitespace = false;
+            const b = self.cursor.buf[self.cursor.pos];
+            switch (b) {
+                // Whitespace & control characters
+                0...32, '#' => {
+                    if (self.cursor.chompTrivia()) |indent| {
+                        try self.output.pushNewline(indent);
+                    }
+                    sawWhitespace = true;
+                },
+
+                // Dot (.)
+                '.' => {
+                    const next = self.cursor.peekAt(1);
+                    if (next) |n| {
+                        if (n == '.') {
+                            if (self.cursor.peekAt(2) == '.') {
+                                self.cursor.pos += 3;
+                                try self.output.pushToken(.TripleDot, start, 3);
+                            } else {
+                                self.cursor.pos += 2;
+                                try self.output.pushToken(.DoubleDot, start, 2);
+                            }
+                        } else if (n >= '0' and n <= '9') {
+                            self.cursor.pos += 1;
+                            self.cursor.chompInteger();
+                            const len = self.cursor.pos - start;
+                            try self.output.pushToken(if (sp) .DotInt else .NoSpaceDotInt, start, len);
+                        } else if (n >= 'a' and n <= 'z') {
+                            self.cursor.pos += 1;
+                            self.cursor.chompIdentGeneral();
+                            const len = self.cursor.pos - start;
+                            try self.output.pushToken(if (sp) .DotLowerIdent else .NoSpaceDotLowerIdent, start, len);
+                        } else if (n >= 'A' and n <= 'Z') {
+                            self.cursor.pos += 1;
+                            self.cursor.chompIdentGeneral();
+                            const len = self.cursor.pos - start;
+                            try self.output.pushToken(if (sp) .DotUpperIdent else .NoSpaceDotUpperIdent, start, len);
+                        } else if (n >= 0b11000000 and n <= 0xff) {
+                            const info = self.cursor.decodeUnicode(n);
+                            switch (info.tag) {
+                                .LetterUpper => {
+                                    self.cursor.pos += info.length;
+                                    self.cursor.chompIdentGeneral();
+                                    const len = self.cursor.pos - start;
+                                    try self.output.pushToken(if (sp) .DotUpperIdent else .NoSpaceDotUpperIdent, start, len);
+                                },
+                                .LetterNotUpper => {
+                                    self.cursor.pos += info.length;
+                                    self.cursor.chompIdentGeneral();
+                                    const len = self.cursor.pos - start;
+                                    try self.output.pushToken(if (sp) .DotLowerIdent else .NoSpaceDotLowerIdent, start, len);
+                                },
+                                else => {
+                                    self.cursor.pos += info.length;
+                                    self.cursor.pushMessageHere(.UnknownToken);
+                                },
+                            }
+                        } else if (n == '{') {
+                            self.cursor.pos += 1;
+                            try self.output.pushToken(.Dot, start, 1);
+                        } else {
+                            self.cursor.pos += 1;
+                            try self.output.pushToken(.Dot, start, 1);
+                        }
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.Dot, start, 1);
+                    }
+                },
+
+                // Minus (-)
+                '-' => {
+                    const next = self.cursor.peekAt(1);
+                    if (next) |n| {
+                        if (n == '>') {
+                            self.cursor.pos += 2;
+                            try self.output.pushToken(.OpArrow, start, 2);
+                        } else if (n == ' ' or n == '\t' or n == '\n' or n == '\r' or n == '#') {
+                            self.cursor.pos += 1;
+                            try self.output.pushToken(.OpBinaryMinus, start, 1);
+                        } else if (n >= '0' and n <= '9' and sp) {
+                            self.cursor.pos += 1;
+                            while (self.cursor.pos < self.cursor.buf.len and std.ascii.isDigit(self.cursor.buf[self.cursor.pos])) {
+                                self.cursor.pos += 1;
+                            }
+                            const len = self.cursor.pos - start;
+                            try self.output.pushToken(.Int, start, len);
+                        } else {
+                            self.cursor.pos += 1;
+                            const tokenType: Token.Tag = if (sp) .OpUnaryMinus else .OpBinaryMinus;
+                            try self.output.pushToken(tokenType, start, 1);
+                        }
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(if (sp) .OpUnaryMinus else .OpBinaryMinus, start, 1);
+                    }
+                },
+
+                // Exclamation (!)
+                '!' => {
+                    if (self.cursor.peekAt(1) == '=') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpNotEquals, start, 2);
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpBang, start, 1);
+                    }
+                },
+
+                // Ampersand (&)
+                '&' => {
+                    if (self.cursor.peekAt(1) == '&') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpAnd, start, 2);
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpAmpersand, start, 1);
+                    }
+                },
+
+                // Comma (,)
+                ',' => {
+                    self.cursor.pos += 1;
+                    try self.output.pushToken(.Comma, start, 1);
+                },
+
+                // Question mark (?)
+                '?' => {
+                    self.cursor.pos += 1;
+                    try self.output.pushToken(.OpQuestion, start, 1);
+                },
+
+                // Pipe (|)
+                '|' => {
+                    if (self.cursor.peekAt(1) == '|') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpOr, start, 2);
+                    } else if (self.cursor.peekAt(1) == '>') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpPizza, start, 2);
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpBar, start, 1);
+                    }
+                },
+
+                // Plus (+)
+                '+' => {
+                    self.cursor.pos += 1;
+                    try self.output.pushToken(.OpPlus, start, 1);
+                },
+
+                // Star (*)
+                '*' => {
+                    self.cursor.pos += 1;
+                    try self.output.pushToken(.OpStar, start, 1);
+                },
+
+                // Slash (/)
+                '/' => {
+                    if (self.cursor.peekAt(1) == '/') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpDoubleSlash, start, 2);
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpSlash, start, 1);
+                    }
+                },
+
+                // Backslash (\)
+                '\\' => {
+                    self.cursor.pos += 1;
+                    try self.output.pushToken(.OpBackslash, start, 1);
+                },
+
+                // Percent (%)
+                '%' => {
+                    self.cursor.pos += 1;
+                    try self.output.pushToken(.OpPercent, start, 1);
+                },
+
+                // Caret (^)
+                '^' => {
+                    self.cursor.pos += 1;
+                    try self.output.pushToken(.OpCaret, start, 1);
+                },
+
+                // Greater-than (>)
+                '>' => {
+                    if (self.cursor.peekAt(1) == '=') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpGreaterThanOrEq, start, 2);
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpGreaterThan, start, 1);
+                    }
+                },
+
+                // Less-than (<)
+                '<' => {
+                    if (self.cursor.peekAt(1) == '=') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpLessThanOrEq, start, 2);
+                    } else if (self.cursor.peekAt(1) == '-') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpBackArrow, start, 2);
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpLessThan, start, 1);
+                    }
+                },
+
+                // Equals (=)
+                '=' => {
+                    if (self.cursor.peekAt(1) == '=') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpEquals, start, 2);
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpAssign, start, 1);
+                    }
+                },
+
+                // Colon (:)
+                ':' => {
+                    if (self.cursor.peekAt(1) == '=') {
+                        self.cursor.pos += 2;
+                        try self.output.pushToken(.OpColonEqual, start, 2);
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpColon, start, 1);
+                    }
+                },
+
+                '(' => {
+                    self.cursor.pos += 1;
+                    try self.stack.append(.Round);
+                    try self.output.pushToken(.OpenRound, start, 1);
+                },
+                '[' => {
+                    self.cursor.pos += 1;
+                    try self.stack.append(.Square);
+                    try self.output.pushToken(.OpenSquare, start, 1);
+                },
+                '{' => {
+                    self.cursor.pos += 1;
+                    try self.stack.append(.Curly);
+                    try self.output.pushToken(.OpenCurly, start, 1);
+                },
+
+                ')' => {
+                    try self.output.pushToken(.CloseRound, start, 1);
+                    try self.consumeBraceCloseAndContinueStringInterp(.Round);
+                },
+                ']' => {
+                    try self.output.pushToken(.CloseSquare, start, 1);
+                    try self.consumeBraceCloseAndContinueStringInterp(.Square);
+                },
+                '}' => {
+                    try self.output.pushToken(.CloseCurly, start, 1);
+                    try self.consumeBraceCloseAndContinueStringInterp(.Curly);
+                },
+
+                '_' => {
+                    const next = self.cursor.peekAt(1);
+                    if (next) |n| {
+                        if ((n >= 'a' and n <= 'z') or (n >= 'A' and n <= 'Z') or (n >= '0' and n <= '9')) {
+                            self.cursor.pos += 2;
+                            self.cursor.chompIdentGeneral();
+                            const len = self.cursor.pos - start;
+                            try self.output.pushToken(.NamedUnderscore, start, len);
+                        } else {
+                            self.cursor.pos += 1;
+                            try self.output.pushToken(.Underscore, start, 1);
+                        }
+                    } else {
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.Underscore, start, 1);
+                    }
+                },
+
+                '@' => {
+                    const next = self.cursor.peekAt(1);
+                    if (next) |n| {
+                        if ((n >= 'a' and n <= 'z') or (n >= 'A' and n <= 'Z') or (n >= '0' and n <= '9')) {
+                            self.cursor.pos += 2;
+                            self.cursor.chompIdentGeneral();
+                            const len = self.cursor.pos - start;
+                            try self.output.pushToken(.OpaqueName, start, len);
+                        } else {
+                            self.cursor.pushMessageHere(.OpaqueNameWithoutName);
+                            self.cursor.pos += 1;
+                            try self.output.pushToken(.OpaqueName, start, 1);
+                        }
+                    } else {
+                        self.cursor.pushMessageHere(.OpaqueNameWithoutName);
+                        self.cursor.pos += 1;
+                        try self.output.pushToken(.OpaqueName, start, 1);
+                    }
+                },
+
+                // Numbers starting with 0-9
+                '0'...'9' => {
+                    _ = self.cursor.chompNumber(b);
+                    const len = self.cursor.pos - start;
+                    try self.output.pushToken(.Int, start, len);
+                },
+
+                // Lowercase identifiers
+                'a'...'z' => {
+                    self.cursor.pos += 1;
+                    _ = self.cursor.chompIdentLower();
+                    const len = self.cursor.pos - start;
+                    try self.output.pushToken(.LowerIdent, start, len);
+                },
+
+                // Uppercase identifiers
+                'A'...'Z' => {
+                    self.cursor.pos += 1;
+                    _ = self.cursor.chompIdentGeneral();
+                    const len = self.cursor.pos - start;
+                    try self.output.pushToken(.UpperIdent, start, len);
+                },
+
+                // String-like literal starting with a single or double quote
+                '"', '\'' => {
+                    // Note this may return StringBegin/StringPart instead of String,
+                    // in the case of a string interpolation.
+                    const tok = try self.tokenizeStringLikeLiteral(b);
+                    try self.output.pushToken(tok, start, self.cursor.pos - start);
+                },
+
+                // first byte of a UTF-8 sequence
+                0b11000000...0xff => {
+                    const info = self.cursor.decodeUnicode(b);
+                    switch (info.tag) {
+                        .LetterUpper => {
+                            self.cursor.pos += info.length;
+                            self.cursor.chompIdentGeneral();
+                            const len = self.cursor.pos - start;
+                            try self.output.pushToken(.UpperIdent, start, len);
+                        },
+                        .LetterNotUpper => {
+                            self.cursor.pos += info.length;
+                            self.cursor.chompIdentGeneral();
+                            const len = self.cursor.pos - start;
+                            try self.output.pushToken(.LowerIdent, start, len);
+                        },
+                        else => {
+                            self.cursor.pos += info.length;
+                            self.cursor.pushMessageHere(.UnknownToken);
+                        },
+                    }
+                },
+
+                // Fallback for any unknown token.
+                else => {
+                    self.cursor.pushMessageHere(.UnknownToken);
+                    self.cursor.pos += 1;
+                },
+            }
+        }
+
+        try self.pushToken(.EndOfFile, 0);
+    }
+
+    pub fn tokenizeStringLikeLiteral(self: *Tokenizer, term: u8) !Token.Tag {
+        const start = self.cursor.pos;
+        // Skip the initial quote.
+        self.cursor.pos += 1;
+        var kind: StringKind = .single_line;
+        if (self.cursor.peek() == term and self.cursor.peekAt(1) == term) {
+            self.cursor.pos += 2;
+            kind = .multi_line;
+        }
+        return try self.tokenizeStringLikeLiteralBody(.start, kind, term, start);
+    }
+
+    const StringState = enum {
+        start,
+        after_interpolation,
+    };
+
+    const StringKind = enum {
+        single_line,
+        multi_line,
+    };
+
+    pub fn tokenizeStringLikeLiteralBody(self: *Tokenizer, state: StringState, kind: StringKind, term: u8, start: u32) !Token.Tag {
+        var escape: bool = false;
+        while (self.cursor.pos < self.cursor.buf.len) {
+            const c = self.cursor.buf[self.cursor.pos];
+            if (escape) {
+                switch (c) {
+                    '\\', '"', '\'', 'n', 'r', 't' => {
+                        escape = false;
+                        self.cursor.pos += 1;
+                    },
+                    'u' => {
+                        escape = false;
+                        self.cursor.pos += 1;
+                        self.cursor.require('(', .InvalidUnicodeEscapeSequence);
+                        while (true) {
+                            if (self.cursor.peek() == ')') {
+                                self.cursor.pos += 1;
+                                break;
+                            } else if (self.cursor.peek() != null) {
+                                const next = self.cursor.peek() orelse 0;
+                                if ((next >= '0' and next <= '9') or
+                                    (next >= 'a' and next <= 'f') or
+                                    (next >= 'A' and next <= 'F'))
+                                {
+                                    self.cursor.pos += 1;
+                                } else {
+                                    self.cursor.pushMessageHere(.InvalidUnicodeEscapeSequence);
+                                    break;
+                                }
+                            } else {
+                                break;
+                            }
+                        }
+                    },
+                    else => {
+                        self.cursor.pushMessageHere(.InvalidEscapeSequence);
+                        escape = false;
+                        self.cursor.pos += 1;
+                    },
+                }
+            } else {
+                if (c == '\\') {
+                    escape = true;
+                    self.cursor.pos += 1;
+                } else if (c == '$' and self.cursor.peekAt(1) == '{') {
+                    self.cursor.pos += 1;
+                    var brace: BraceKind = undefined;
+                    if (term == '"') {
+                        switch (kind) {
+                            .multi_line => brace = .StringInterpolationMultiline,
+                            .single_line => brace = .StringInterpolation,
+                        }
+                    } else {
+                        switch (kind) {
+                            .multi_line => brace = .SingleQuoteInterpolationMultiline,
+                            .single_line => brace = .SingleQuoteInterpolation,
+                        }
+                    }
+                    try self.stack.append(brace);
+                    switch (term) {
+                        '"' => {
+                            switch (state) {
+                                .start => return .StringBegin,
+                                .after_interpolation => return .StringPart,
+                            }
+                        },
+                        '\'' => {
+                            std.debug.assert(term == '\'');
+                            switch (state) {
+                                .start => return .SingleQuoteBegin,
+                                .after_interpolation => return .SingleQuotePart,
+                            }
+                        },
+                        else => std.debug.assert(false),
+                    }
+                } else if (c == '\n') {
+                    if (kind == .single_line) {
+                        self.cursor.pushMessage(.UnclosedString, @intCast(start), @intCast(self.cursor.pos));
+                        return .String;
+                    } else {
+                        self.cursor.pos += 1;
+                    }
+                } else {
+                    if (kind == .single_line and c == term) {
+                        self.cursor.pos += 1;
+                        return .String;
+                    } else if (kind == .multi_line and c == term and self.cursor.peekAt(1) == term and self.cursor.peekAt(2) == term) {
+                        self.cursor.pos += 3;
+                        return .String;
+                    }
+                    self.cursor.pos += 1;
+                }
+            }
+        }
+        const diag: Diagnostic.Tag = if (term == '"') .UnclosedString else .UnclosedSingleQuote;
+        self.cursor.pushMessage(diag, start, self.cursor.pos);
+        if (state == .after_interpolation) {
+            return if (term == '"') .StringPart else .SingleQuotePart;
+        } else {
+            return if (term == '"') .String else .SingleQuote;
+        }
+    }
+};
diff --git a/src/main.zig b/src/main.zig
index 4d8d2afe6d4..e07f0d48f7a 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -3,6 +3,7 @@ const mem = std.mem;
 const Allocator = std.mem.Allocator;
 const RocCmd = @import("cli.zig").RocCmd;
 const RocOpt = @import("cli.zig").RocOpt;
+const syntax = @import("check/syntax.zig");
 
 const usage =
     \\Usage:
@@ -138,11 +139,20 @@ fn rocVersion(allocator: Allocator, args: []const []const u8) !void {
 }
 
 fn rocCheck(allocator: Allocator, opt: RocOpt, args: []const []const u8) !void {
-    _ = allocator;
-
-    std.debug.print("TODO roc check\n{}\n{s}\n\n", .{ opt, args });
-
-    fatal("not implemented", .{});
+    var syn = try syntax.Syntax.init(allocator);
+    defer syn.deinit();
+    _ = opt;
+
+    // Temporary implementation for early testing
+    const dir_path = args[0];
+    const fs = std.fs.cwd();
+    var dir = try fs.openDir(dir_path, .{ .iterate = true });
+    defer dir.close();
+
+    const success = try syn.tokenizeAndCheckSyntaxFiles(dir);
+    if (!success) {
+        fatal("syntax check failed", .{});
+    }
 }
 
 fn rocDocs(allocator: Allocator, opt: RocOpt, args: []const []const u8) !void {
diff --git a/www/main.roc b/www/main.roc
index e52613fad23..7b193809648 100644
--- a/www/main.roc
+++ b/www/main.roc
@@ -64,11 +64,11 @@ get_page_info = \page_path_str ->
                 Str.split_on(page_path_str, "/")
                 |> List.take_last(2)
                 |> List.first # we use the folder for name for the page title, e.g. Json from examples/Json/README.html
-                |> unwrap_or_crash("This List.first should never fail. pagePathStr ($(page_path_str)) did not contain any `/`.")
+                |> unwrap_or_crash("This List.first should never fail. page_path_str ($(page_path_str)) did not contain any `/`.")
                 |> (\page_title ->
                     { title: "$(page_title) | Roc", description: "$(page_title) example in the Roc programming language." })
             else
-                crash("Web page $(page_path_str) did not have a title and description specified in the pageData Dict. Please add one.")
+                crash("Web page $(page_path_str) did not have a title and description specified in the page_data Dict. Please add one.")
 
 unwrap_or_crash : Result a b, Str -> a where b implements Inspect
 unwrap_or_crash = \result, error_msg ->