Fix build with rust nightly by updating try block syntax. (#2965)

Author: zachlute

Cargo.lock

@@ -47,9 +47,9 @@ env_logger = "0.5"
 getopts = "0.2"
 derive-new = "0.5"
 cargo_metadata = "0.6"
-rustc-ap-rustc_target = "235.0.0"
-rustc-ap-syntax = "235.0.0"
-rustc-ap-syntax_pos = "235.0.0"
+rustc-ap-rustc_target = "237.0.0"
+rustc-ap-syntax = "237.0.0"
+rustc-ap-syntax_pos = "237.0.0"
 failure = "0.1.1"
 
 [dev-dependencies]

Cargo.toml

@@ -173,7 +173,7 @@ fn rewrite_closure_expr(
         match expr.node {
             ast::ExprKind::Match(..)
             | ast::ExprKind::Block(..)
-            | ast::ExprKind::Catch(..)
+            | ast::ExprKind::TryBlock(..)
             | ast::ExprKind::Loop(..)
             | ast::ExprKind::Struct(..) => true,
 

src/closures.rs

@@ -317,22 +317,17 @@ pub fn format_expr(
         // We do not format these expressions yet, but they should still
         // satisfy our width restrictions.
         ast::ExprKind::InlineAsm(..) => Some(context.snippet(expr.span).to_owned()),
-        ast::ExprKind::Catch(ref block) => {
-            if let rw @ Some(_) = rewrite_single_line_block(
-                context,
-                "do catch ",
-                block,
-                Some(&expr.attrs),
-                None,
-                shape,
-            ) {
+        ast::ExprKind::TryBlock(ref block) => {
+            if let rw @ Some(_) =
+                rewrite_single_line_block(context, "try ", block, Some(&expr.attrs), None, shape)
+            {
                 rw
             } else {
-                // 9 = `do catch `
+                // 9 = `try `
                 let budget = shape.width.saturating_sub(9);
                 Some(format!(
                     "{}{}",
-                    "do catch ",
+                    "try ",
                     rewrite_block(
                         block,
                         Some(&expr.attrs),

src/expr.rs

@@ -1,27 +1,28 @@
-#![feature(catch_expr)]
+// rustfmt-edition: Edition2018
+#![feature(try_blocks)]
 
 fn main() {
-    let x = do catch {
+    let x = try {
         foo()?
     };
 
-    let x = do catch /* Invisible comment */ { foo()? };
+    let x = try /* Invisible comment */ { foo()? };
 
-    let x = do catch {
+    let x = try {
         unsafe { foo()? }
     };
 
-    let y = match (do catch {
+    let y = match (try {
         foo()?
     }) {
         _ => (),
     };
 
-    do catch {
+    try {
         foo()?;
     };
 
-    do catch {
-        // Regular do catch block
+    try {
+        // Regular try block
     };
 }

tests/source/catch.rs

@@ -1,21 +1,22 @@
-#![feature(catch_expr)]
+// rustfmt-edition: Edition2018
+#![feature(try_blocks)]
 
 fn main() {
-    let x = do catch { foo()? };
+    let x = try { foo()? };
 
-    let x = do catch /* Invisible comment */ { foo()? };
+    let x = try /* Invisible comment */ { foo()? };
 
-    let x = do catch { unsafe { foo()? } };
+    let x = try { unsafe { foo()? } };
 
-    let y = match (do catch { foo()? }) {
+    let y = match (try { foo()? }) {
         _ => (),
     };
 
-    do catch {
+    try {
         foo()?;
     };
 
-    do catch {
-        // Regular do catch block
+    try {
+        // Regular try block
     };
 }