1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_ssa/src/mir/operand.rs b/compiler/rustc_codegen_ssa/src/mir/operand.rs
index 0ab2b7ecd9c..6661f1f81e6 100644
--- a/compiler/rustc_codegen_ssa/src/mir/operand.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/operand.rs
@@ -414,6 +414,7 @@ impl<'a, 'tcx, V: CodegenObject> OperandValue<V> {
                 // value is through `undef`/`poison`, and the store itself is useless.
             }
             OperandValue::Ref(r, None, source_align) => {
+                assert!(dest.layout.is_sized(), "cannot directly store unsized values");
                 if flags.contains(MemFlags::NONTEMPORAL) {
                     // HACK(nox): This is inefficient but there is no nontemporal memcpy.
                     let ty = bx.backend_type(dest.layout);