Teach llvm backend how to fall back to default bodies

1 files changed, 4 insertions, 3 deletions

diff --git a/compiler/rustc_mir_transform/src/instsimplify.rs b/compiler/rustc_mir_transform/src/instsimplify.rs
index 81cf31e6bf4..a9de37244c5 100644
--- a/compiler/rustc_mir_transform/src/instsimplify.rs
+++ b/compiler/rustc_mir_transform/src/instsimplify.rs
@@ -296,9 +296,9 @@ impl<'tcx> InstSimplifyContext<'tcx, '_> {
         if args.is_empty() {
             return;
         }
-        let ty = args.type_at(0);
 
-        let known_is_valid = intrinsic_assert_panics(self.tcx, self.param_env, ty, intrinsic_name);
+        let known_is_valid =
+            intrinsic_assert_panics(self.tcx, self.param_env, args[0], intrinsic_name);
         match known_is_valid {
             // We don't know the layout or it's not validity assertion at all, don't touch it
             None => {}
@@ -317,10 +317,11 @@ impl<'tcx> InstSimplifyContext<'tcx, '_> {
 fn intrinsic_assert_panics<'tcx>(
     tcx: TyCtxt<'tcx>,
     param_env: ty::ParamEnv<'tcx>,
-    ty: Ty<'tcx>,
+    arg: ty::GenericArg<'tcx>,
     intrinsic_name: Symbol,
 ) -> Option<bool> {
     let requirement = ValidityRequirement::from_intrinsic(intrinsic_name)?;
+    let ty = arg.expect_ty();
     Some(!tcx.check_validity_requirement((requirement, param_env.and(ty))).ok()?)
 }