[clang] [Clang] disallow attributes on void parameters (PR #124920)

[Oleksandr T. via cfe-commits]

================
@@ -453,3 +453,12 @@ namespace P2361 {
 }
 
 alignas(int) struct AlignAsAttribute {}; // expected-error {{misplaced 
attributes; expected attributes here}}
+
+namespace GH108819 {
+void a([[maybe_unused]] void) {}                 // expected-error {{an 
attribute list cannot appear here}} \
----------------
a-tarasyuk wrote:

Thanks for the feedback, I'll check `SemaDeclAttr`. should a different message 
be used here instead?

https://github.com/llvm/llvm-project/pull/124920
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