remove ImplWfCheck

Signed-off-by: Miguel Guarniz <mi9uel9@gmail.com>

Author: kckeiks

compiler/rustc_typeck/src/impl_wf_check.rs

@@ -16,7 +16,6 @@ use rustc_errors::struct_span_err;
 use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::LocalDefId;
-use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::{self, TyCtxt, TypeFoldable};
 use rustc_span::Span;
@@ -83,29 +82,6 @@ pub fn provide(providers: &mut Providers) {
     *providers = Providers { check_mod_impl_wf, ..*providers };
 }
 
-struct ImplWfCheck<'tcx> {
-    tcx: TyCtxt<'tcx>,
-    min_specialization: bool,
-}
-
-impl<'tcx> ItemLikeVisitor<'tcx> for ImplWfCheck<'tcx> {
-    fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
-        if let hir::ItemKind::Impl(ref impl_) = item.kind {
-            enforce_impl_params_are_constrained(self.tcx, item.def_id, impl_.items);
-            enforce_impl_items_are_distinct(self.tcx, impl_.items);
-            if self.min_specialization {
-                check_min_specialization(self.tcx, item.def_id.to_def_id(), item.span);
-            }
-        }
-    }
-
-    fn visit_trait_item(&mut self, _trait_item: &'tcx hir::TraitItem<'tcx>) {}
-
-    fn visit_impl_item(&mut self, _impl_item: &'tcx hir::ImplItem<'tcx>) {}
-
-    fn visit_foreign_item(&mut self, _foreign_item: &'tcx hir::ForeignItem<'tcx>) {}
-}
-
 fn enforce_impl_params_are_constrained(
     tcx: TyCtxt<'_>,
     impl_def_id: LocalDefId,