diff --git a/clang/lib/AST/Interp/ByteCodeExprGen.cpp b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
--- a/clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -150,6 +150,8 @@
 
   case CK_IntegralToBoolean:
   case CK_IntegralCast: {
+      if (DiscardResult)
+        return this->discard(SubExpr);
     std::optional<PrimType> FromT = classify(SubExpr->getType());
     std::optional<PrimType> ToT = classify(CE->getType());
     if (!FromT || !ToT)
diff --git a/clang/test/AST/Interp/literals.cpp b/clang/test/AST/Interp/literals.cpp
--- a/clang/test/AST/Interp/literals.cpp
+++ b/clang/test/AST/Interp/literals.cpp
@@ -921,6 +921,9 @@
     sizeof(int);
     alignof(int);
 
+    (short)5;
+    (bool)1;
+
     return 0;
   }
   static_assert(ignoredExprs() == 0, "");