[clang] Fix crash and improve diagnostics for void lambda returns (PR #188904)

[Kartik Ohlan via cfe-commits]

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@@ -3715,15 +3715,18 @@ StmtResult Sema::ActOnCapScopeReturnStmt(SourceLocation ReturnLoc,
     // Delay processing for now.  TODO: there are lots of dependent
     // types we can conclusively prove aren't void.
   } else if (FnRetType->isVoidType()) {
-    if (RetValExp && !isa<InitListExpr>(RetValExp) &&
-        !(getLangOpts().CPlusPlus &&
-          (RetValExp->isTypeDependent() ||
-           RetValExp->getType()->isVoidType()))) {
-      if (!getLangOpts().CPlusPlus &&
-          RetValExp->getType()->isVoidType())
+    if (RetValExp && isa<InitListExpr>(RetValExp)) {
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Ko496-glitch wrote:

done

https://github.com/llvm/llvm-project/pull/188904