[clang] [clang][Sema] Emit more specific diagnostic for auto in lambda before C++14 (#46059) (PR #68540)

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================
@@ -3605,8 +3605,11 @@ static QualType 
GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
         Info = &SemaRef.InventedParameterInfos.back();
       } else {
         // In C++14, generic lambdas allow 'auto' in their parameters.
-        if (!SemaRef.getLangOpts().CPlusPlus14 || !Auto ||
-            Auto->getKeyword() != AutoTypeKeyword::Auto) {
+        if (!SemaRef.getLangOpts().CPlusPlus14 && Auto &&
+            Auto->getKeyword() == AutoTypeKeyword::Auto) {
+          Error = 24;
----------------
weltschildkroete wrote:

Makes sense. I added some similar comments as well.

https://github.com/llvm/llvm-project/pull/68540
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