Do not rely on type_var_origin in OrphanCheckErr::NonLocalInputType

compiler/rustc_next_trait_solver/src/coherence.rs

@@ -4,7 +4,8 @@ use std::ops::ControlFlow;
 use derive_where::derive_where;
 use rustc_type_ir::inherent::*;
 use rustc_type_ir::{
-    self as ty, InferCtxtLike, Interner, TypeVisitable, TypeVisitableExt, TypeVisitor,
+    self as ty, InferCtxtLike, Interner, TrivialTypeTraversalImpls, TypeVisitable,
+    TypeVisitableExt, TypeVisitor,
 };
 use tracing::instrument;
 
@@ -95,6 +96,8 @@ pub fn trait_ref_is_local_or_fundamental<I: Interner>(tcx: I, trait_ref: ty::Tra
     trait_ref.def_id.is_local() || tcx.trait_is_fundamental(trait_ref.def_id)
 }
 
+TrivialTypeTraversalImpls! { IsFirstInputType, }
+
 #[derive(Debug, Copy, Clone)]
 pub enum IsFirstInputType {
     No,