Set `nullptr` to the default value of the target VarDeclBase (#4757)

1 files changed, 5 insertions, 1 deletions

diff --git a/source/slang/slang-check-conversion.cpp b/source/slang/slang-check-conversion.cpp
index fafefa9dd..c66d4092e 100644
--- a/source/slang/slang-check-conversion.cpp
+++ b/source/slang/slang-check-conversion.cpp
@@ -903,7 +903,11 @@ namespace Slang
                 *outCost = kConversionCost_NullPtrToPtr;
             }
             if (outToExpr)
-                *outToExpr = fromExpr;
+            {
+                auto* defaultExpr = getASTBuilder()->create<DefaultConstructExpr>();
+                defaultExpr->type = QualType(toType);
+                *outToExpr = defaultExpr;
+            }
             return true;
         }
         // none_t can be cast into any Optional<T> type.