Rollup merge of #130721 - GrigorenkoPV:block-no-opening-brace, r=jieyouxu

Add more test cases for block-no-opening-brace

Also add FIXME's for #80931 & #78168

tests/ui/parser/block-no-opening-brace.rs

@@ -4,28 +4,46 @@
 
 fn main() {}
 
-fn f1() {
+fn in_loop() {
     loop
         let x = 0; //~ ERROR expected `{`, found keyword `let`
         drop(0);
 }
 
-fn f2() {
+fn in_while() {
     while true
         let x = 0; //~ ERROR expected `{`, found keyword `let`
 }
 
-fn f3() {
+fn in_for() {
     for x in 0..1
         let x = 0; //~ ERROR expected `{`, found keyword `let`
 }
 
-fn f4() {
+
+// FIXME
+fn in_try() {
     try //~ ERROR expected expression, found reserved keyword `try`
         let x = 0;
 }
 
-fn f5() {
+// FIXME(#80931)
+fn in_async() {
     async
         let x = 0; //~ ERROR expected one of `move`, `|`, or `||`, found keyword `let`
 }
+
+// FIXME(#78168)
+fn in_const() {
+    let x = const 2; //~ ERROR expected expression, found keyword `const`
+}
+
+// FIXME(#78168)
+fn in_const_in_match() {
+    let x = 2;
+    match x {
+        const 2 => {}
+        //~^ ERROR expected identifier, found keyword `const`
+        //~| ERROR expected one of `=>`, `if`, or `|`, found `2`
+    }
+}

tests/ui/parser/block-no-opening-brace.stderr

@@ -38,18 +38,36 @@ LL |         { let x = 0; }
    |         +            +
 
 error: expected expression, found reserved keyword `try`
-  --> $DIR/block-no-opening-brace.rs:24:5
+  --> $DIR/block-no-opening-brace.rs:26:5
    |
 LL |     try
    |     ^^^ expected expression
 
 error: expected one of `move`, `|`, or `||`, found keyword `let`
-  --> $DIR/block-no-opening-brace.rs:30:9
+  --> $DIR/block-no-opening-brace.rs:33:9
    |
 LL |     async
    |          - expected one of `move`, `|`, or `||`
 LL |         let x = 0;
    |         ^^^ unexpected token
 
-error: aborting due to 5 previous errors
+error: expected expression, found keyword `const`
+  --> $DIR/block-no-opening-brace.rs:38:13
+   |
+LL |     let x = const 2;
+   |             ^^^^^ expected expression
+
+error: expected identifier, found keyword `const`
+  --> $DIR/block-no-opening-brace.rs:45:9
+   |
+LL |         const 2 => {}
+   |         ^^^^^ expected identifier, found keyword
+
+error: expected one of `=>`, `if`, or `|`, found `2`
+  --> $DIR/block-no-opening-brace.rs:45:15
+   |
+LL |         const 2 => {}
+   |               ^ expected one of `=>`, `if`, or `|`
+
+error: aborting due to 8 previous errors