rustc_middle: Remove trait `DefIdTree`

This trait was a way to generalize over both `TyCtxt` and `Resolver`, but now `Resolver` has access to `TyCtxt`, so this trait is no longer necessary.

1 files changed, 1 insertions, 3 deletions

diff --git a/compiler/rustc_transmute/src/maybe_transmutable/query_context.rs b/compiler/rustc_transmute/src/maybe_transmutable/query_context.rs
index e4f3e7928da..0cae0377ee8 100644
--- a/compiler/rustc_transmute/src/maybe_transmutable/query_context.rs
+++ b/compiler/rustc_transmute/src/maybe_transmutable/query_context.rs
@@ -58,9 +58,7 @@ mod rustc {
             use rustc_middle::ty;
 
             let parent = if let ty::Adt(adt_def, ..) = scope.kind() {
-                use rustc_middle::ty::DefIdTree;
-                let parent = self.parent(adt_def.did());
-                parent
+                self.parent(adt_def.did())
             } else {
                 // Is this always how we want to handle a non-ADT scope?
                 return false;