[flang] Prevent crash in error case: elemental with alternate return

When an ELEMENTAL subroutine is erroneously declared with alternate return
arguments, don't crash when checking the ranks of the actual arguments.

Differential Revision: https://reviews.llvm.org/D140143

diff --git a/flang/lib/Semantics/check-call.cpp b/flang/lib/Semantics/check-call.cpp
index 76cb96c..104ea7a 100644 (file)
--- a/flang/lib/Semantics/check-call.cpp
+++ b/flang/lib/Semantics/check-call.cpp
@@ -891,7 +891,7 @@ static bool CheckElementalConformance(parser::ContextualMessages &messages,
   int index{0};
   bool hasArrayArg{false};
   for (const auto &arg : actuals) {
-    if (arg && arg.value().Rank() > 0) {
+    if (arg && !arg->isAlternateReturn() && arg->Rank() > 0) {
       hasArrayArg = true;
       break;
     }