[clang] [Clang] Don't treat a declaration that declares nothing as an invalid statement (PR #224682)

[Akash Manna via cfe-commits]

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@@ -77,8 +77,10 @@ StmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg, SourceLocation StartLoc,
                                SourceLocation EndLoc) {
   DeclGroupRef DG = dg.get();
 
-  // If we have an invalid decl, just return an error.
-  if (DG.isNull()) return StmtError();
+  // No declarations, so no statement. This is not an error: `int;` only warns,
+  // and a group emptied by an error was already diagnosed.
+  if (DG.isNull())
+    return StmtEmpty();
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akash-manna-sky wrote:

I agreed!. The parser builds the null statement itself when the declaration produced nothing, and `ActOnDeclStmt` is unchanged.


https://github.com/llvm/llvm-project/pull/224682