================
@@ -21887,9 +21689,11 @@ ExprResult Sema::CheckPlaceholderExpr(Expr *E) {
   case BuiltinType::ArraySection:
     // If we've already diagnosed something on the array section type, we
     // shouldn't need to do any further diagnostic here.
-    if (!E->containsErrors())
-      Diag(E->getBeginLoc(), diag::err_array_section_use)
-          << cast<ArraySectionExpr>(E)->isOMPArraySection();
+    if (!E->containsErrors()) {
+      if (auto *ASE = dyn_cast<ArraySectionExpr>(E->IgnoreParens()))
----------------
ojhunt wrote:

I don't think it's safe to skip this error at all - we're in an error path and 
if we skip emitting the error I think it's possible that we'll end up trying to 
emit code. If you can work out a way to trigger this path we'll need to just 
adjust the diagnostic we generate, not skip it entirely.

https://github.com/llvm/llvm-project/pull/183633
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