[clang] [C23][Parser] Diagnostic for attribute declaration where statement is required (PR #146224)

[Aaron Ballman via cfe-commits]

================
@@ -35,7 +36,7 @@ void f(int n) {
       [[fallthrough]];
     }
   case 8:
-    [[fallthrough]]; // expected-error {{does not directly precede switch 
label}}
+    [[fallthrough]]; // FIXME: The error {{does not directly precede switch 
label}} cannot reproduce in this translate unit, But it can be reproduced in a 
separate file.
----------------
AaronBallman wrote:

Huh, I wonder what's going on there...

https://github.com/llvm/llvm-project/pull/146224
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