fix: break inside async closure has incorrect span for enclosing closure

Author: linyihai

compiler/rustc_passes/src/loops.rs

@@ -89,6 +89,12 @@ impl<'a, 'hir> Visitor<'hir> for CheckLoopVisitor<'a, 'hir> {
             hir::ExprKind::Closure(&hir::Closure {
                 ref fn_decl, body, fn_decl_span, kind, ..
             }) => {
+                let fn_decl_span = match self.cx {
+                    Coroutine { coroutine_span: span, .. } | Closure(span) => {
+                        fn_decl_span.with_lo(span.lo())
+                    }
+                    _ => fn_decl_span,
+                };
                 let cx = match kind {
                     hir::ClosureKind::Coroutine(hir::CoroutineKind::Desugared(kind, source)) => {
                         Coroutine { coroutine_span: fn_decl_span, kind, source }

tests/ui/coroutine/break-inside-coroutine-issue-124495.rs

@@ -20,6 +20,9 @@ fn main() {
     let _ = async { break; }; //~ ERROR `break` inside `async` block
     let _ = async || { break; }; //~ ERROR `break` inside `async` closure
 
+    let _ = || || || break; //~ ERROR `break` inside of a closure
+    let _ = async || async || async || break; //~ ERROR `break` inside `async` closure
+
     let _ = gen { break; }; //~ ERROR `break` inside `gen` block
 
     let _ = async gen { break; }; //~ ERROR `break` inside `async gen` block

tests/ui/coroutine/break-inside-coroutine-issue-124495.stderr

@@ -41,13 +41,30 @@ error[E0267]: `break` inside `async` closure
   --> $DIR/break-inside-coroutine-issue-124495.rs:21:24
    |
 LL |     let _ = async || { break; };
-   |                      --^^^^^---
-   |                      | |
-   |                      | cannot `break` inside `async` closure
-   |                      enclosing `async` closure
+   |             -----------^^^^^---
+   |             |          |
+   |             |          cannot `break` inside `async` closure
+   |             enclosing `async` closure
+
+error[E0267]: `break` inside of a closure
+  --> $DIR/break-inside-coroutine-issue-124495.rs:23:22
+   |
+LL |     let _ = || || || break;
+   |             -------- ^^^^^ cannot `break` inside of a closure
+   |             |
+   |             enclosing closure
+
+error[E0267]: `break` inside `async` closure
+  --> $DIR/break-inside-coroutine-issue-124495.rs:24:40
+   |
+LL |     let _ = async || async || async || break;
+   |             ---------------------------^^^^^
+   |             |                          |
+   |             |                          cannot `break` inside `async` closure
+   |             enclosing `async` closure
 
 error[E0267]: `break` inside `gen` block
-  --> $DIR/break-inside-coroutine-issue-124495.rs:23:19
+  --> $DIR/break-inside-coroutine-issue-124495.rs:26:19
    |
 LL |     let _ = gen { break; };
    |             ------^^^^^---
@@ -56,14 +73,14 @@ LL |     let _ = gen { break; };
    |             enclosing `gen` block
 
 error[E0267]: `break` inside `async gen` block
-  --> $DIR/break-inside-coroutine-issue-124495.rs:25:25
+  --> $DIR/break-inside-coroutine-issue-124495.rs:28:25
    |
 LL |     let _ = async gen { break; };
    |             ------------^^^^^---
    |             |           |
    |             |           cannot `break` inside `async gen` block
    |             enclosing `async gen` block
 
-error: aborting due to 7 previous errors
+error: aborting due to 9 previous errors
 
 For more information about this error, try `rustc --explain E0267`.