Add tests for the edition of macro_rules from a proc-macro

Author: ehuss

tests/ui/proc-macro/auxiliary/macro_rules_edition_pm.rs

@@ -0,0 +1,42 @@
+//@ force-host
+//@ no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn make_edition_macro(_input: TokenStream) -> TokenStream {
+    "macro_rules! edition {
+        ($_:expr) => {
+            2024
+        };
+        (const {}) => {
+            2021
+        };
+    }
+    "
+    .parse()
+    .unwrap()
+}
+
+#[proc_macro]
+pub fn make_nested_edition_macro(_input: TokenStream) -> TokenStream {
+    "macro_rules! make_inner {
+        () => {
+            macro_rules! edition_inner {
+                ($_:expr) => {
+                    2024
+                };
+                (const {}) => {
+                    2021
+                };
+            }
+        };
+    }
+    "
+    .parse()
+    .unwrap()
+}

tests/ui/proc-macro/macro_rules_edition_from_pm.edition2021.stderr

@@ -0,0 +1,11 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/macro_rules_edition_from_pm.rs:24:5
+   |
+LL |     assert!(edition_inner!(const {}) == 2024);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'assertion failed: edition_inner!(const {}) == 2024', $DIR/macro_rules_edition_from_pm.rs:24:5
+   |
+   = note: this error originates in the macro `assert` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0080`.

tests/ui/proc-macro/macro_rules_edition_from_pm.edition2024.stderr

@@ -0,0 +1,28 @@
+// Tests how edition hygiene works for macro_rules macros generated from a
+// proc-macro.
+// See https://github.com/rust-lang/rust/issues/132906
+
+//@ aux-crate: macro_rules_edition_pm=macro_rules_edition_pm.rs
+//@ revisions: edition2021 edition2024
+//@[edition2021] edition:2021
+//@[edition2024] edition:2024
+//@[edition2024] compile-flags: -Zunstable-options
+//@[edition2024] check-pass
+
+// This checks how the expr fragment specifier works.
+macro_rules_edition_pm::make_edition_macro!{}
+
+const _: () = {
+    assert!(edition!(const {}) == 2021);
+};
+
+// This checks how the expr fragment specifier from a nested macro.
+macro_rules_edition_pm::make_nested_edition_macro!{}
+make_inner!{}
+
+const _: () = {
+    assert!(edition_inner!(const {}) == 2024);
+    //[edition2021]~^ ERROR evaluation of constant value failed
+};
+
+fn main() {}

tests/ui/proc-macro/macro_rules_edition_from_pm.rs

@@ -0,0 +1,22 @@
+//@ force-host
+//@ no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn missing_unsafe(_input: TokenStream) -> TokenStream {
+    "#[no_mangle] pub fn abc() {}".parse().unwrap()
+}
+
+#[proc_macro]
+pub fn macro_rules_missing_unsafe(_input: TokenStream) -> TokenStream {
+    "macro_rules! make_fn {
+        () => { #[no_mangle] pub fn foo() { } };
+    }"
+    .parse()
+    .unwrap()
+}

tests/ui/rust-2024/unsafe-attributes/auxiliary/unsafe-attributes-pm.rs

@@ -0,0 +1,17 @@
+error: unsafe attribute used without unsafe
+  --> $DIR/unsafe-attributes-from-pm.rs:13:1
+   |
+LL | unsafe_attributes_pm::macro_rules_missing_unsafe!();
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ usage of unsafe attribute
+...
+LL | make_fn!();
+   | ---------- in this macro invocation
+   |
+   = note: this error originates in the macro `make_fn` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: wrap the attribute in `unsafe(...)`
+   |
+LL | ununsafe(safe_attributes_pm::macro_rules_missing_unsafe!());
+   |   +++++++                                                +
+
+error: aborting due to 1 previous error
+

tests/ui/rust-2024/unsafe-attributes/unsafe-attributes-from-pm.edition2024.stderr

@@ -0,0 +1,18 @@
+// Test for unsafe attributes generated by a proc-macro.
+// See https://github.com/rust-lang/rust/issues/132906
+
+//@ revisions: edition2021 edition2024
+//@[edition2021] check-pass
+//@[edition2021] edition:2021
+//@[edition2024] edition:2024
+//@[edition2024] compile-flags: -Zunstable-options
+//@ aux-crate: unsafe_attributes_pm=unsafe-attributes-pm.rs
+
+unsafe_attributes_pm::missing_unsafe!();
+
+unsafe_attributes_pm::macro_rules_missing_unsafe!();
+//[edition2024]~^ ERROR unsafe attribute used without unsafe
+
+make_fn!();
+
+fn main() {}