[flang] Fix to UnwrapConvertedExpr()

The utility UnwrapConvertedExpr() was failing to unwrap a
converted TypeParamInquiry operation when called from runtime
derived type description table construction, leading to an
abort in semantics.

Differential Revision: https://reviews.llvm.org/D125119

1 files changed, 14 insertions, 8 deletions

diff --git a/flang/include/flang/Evaluate/tools.h b/flang/include/flang/Evaluate/tools.h
index 77810da17846..ac75de8899bb 100644
--- a/flang/include/flang/Evaluate/tools.h
+++ b/flang/include/flang/Evaluate/tools.h
@@ -219,16 +219,22 @@ auto UnwrapConvertedExpr(B &x) -> common::Constify<A, B> * {
   } else if constexpr (std::is_same_v<Ty, Expr<SomeType>>) {
     return common::visit(
         [](auto &x) { return UnwrapConvertedExpr<A>(x); }, x.u);
-  } else if constexpr (!common::HasMember<A, TypelessExpression>) {
-    using Result = ResultType<A>;
-    if constexpr (std::is_same_v<Ty, Expr<Result>> ||
-        std::is_same_v<Ty, Expr<SomeKind<Result::category>>>) {
+  } else {
+    using DesiredResult = ResultType<A>;
+    if constexpr (std::is_same_v<Ty, Expr<DesiredResult>> ||
+        std::is_same_v<Ty, Expr<SomeKind<DesiredResult::category>>>) {
       return common::visit(
           [](auto &x) { return UnwrapConvertedExpr<A>(x); }, x.u);
-    } else if constexpr (std::is_same_v<Ty, Parentheses<Result>> ||
-        std::is_same_v<Ty, Convert<Result, Result::category>>) {
-      return common::visit(
-          [](auto &x) { return UnwrapConvertedExpr<A>(x); }, x.left().u);
+    } else {
+      using ThisResult = ResultType<B>;
+      if constexpr (std::is_same_v<Ty, Expr<ThisResult>>) {
+        return common::visit(
+            [](auto &x) { return UnwrapConvertedExpr<A>(x); }, x.u);
+      } else if constexpr (std::is_same_v<Ty, Parentheses<ThisResult>> ||
+          std::is_same_v<Ty, Convert<ThisResult, DesiredResult::category>>) {
+        return common::visit(
+            [](auto &x) { return UnwrapConvertedExpr<A>(x); }, x.left().u);
+      }
     }
   }
   return nullptr;