libsyntax: Disallow struct literals after `if`, `while`, `match`, and

`for...in`.

Closes #14803.

If you used a structure literal after one of these keywords, surround it
in parentheses.

[breaking-change]

1 files changed, 3 insertions, 3 deletions

diff --git a/src/test/debuginfo/lexical-scope-in-match.rs b/src/test/debuginfo/lexical-scope-in-match.rs
index 5f13c780ba8..b347afbbbcd 100644
--- a/src/test/debuginfo/lexical-scope-in-match.rs
+++ b/src/test/debuginfo/lexical-scope-in-match.rs
@@ -105,7 +105,7 @@ fn main() {
         _ => {}
     }
 
-    match Struct { x: 237, y: 238 } {
+    match (Struct { x: 237, y: 238 }) {
         Struct { x: shadowed, y: local_to_arm } => {
 
             zzz();
@@ -113,7 +113,7 @@ fn main() {
         }
     }
 
-    match Struct { x: 239, y: 240 } {
+    match (Struct { x: 239, y: 240 }) {
         // ignored field
         Struct { x: shadowed, .. } => {
 
@@ -122,7 +122,7 @@ fn main() {
         }
     }
 
-    match Struct { x: 241, y: 242 } {
+    match (Struct { x: 241, y: 242 }) {
         // with literal
         Struct { x: shadowed, y: 242 } => {