Remove a function that has no necessary callers

Author: oli-obk

compiler/rustc_middle/src/ty/trait_def.rs

@@ -129,21 +129,6 @@ impl<'tcx> TraitDef {
 }
 
 impl<'tcx> TyCtxt<'tcx> {
-    /// `trait_def_id` MUST BE the `DefId` of a trait.
-    pub fn for_each_impl<F: FnMut(DefId)>(self, trait_def_id: DefId, mut f: F) {
-        let impls = self.trait_impls_of(trait_def_id);
-
-        for &impl_def_id in impls.blanket_impls.iter() {
-            f(impl_def_id);
-        }
-
-        for v in impls.non_blanket_impls.values() {
-            for &impl_def_id in v {
-                f(impl_def_id);
-            }
-        }
-    }
-
     /// Iterate over every impl that could possibly match the self type `self_ty`.
     ///
     /// `trait_def_id` MUST BE the `DefId` of a trait.

src/tools/clippy/clippy_lints/src/new_without_default.rs

@@ -97,14 +97,14 @@ impl<'tcx> LateLintPass<'tcx> for NewWithoutDefault {
                         {
                             if self.impling_types.is_none() {
                                 let mut impls = HirIdSet::default();
-                                cx.tcx.for_each_impl(default_trait_id, |d| {
+                                for &d in cx.tcx.local_trait_impls(default_trait_id) {
                                     let ty = cx.tcx.type_of(d).instantiate_identity();
                                     if let Some(ty_def) = ty.ty_adt_def() {
                                         if let Some(local_def_id) = ty_def.did().as_local() {
                                             impls.insert(cx.tcx.local_def_id_to_hir_id(local_def_id));
                                         }
                                     }
-                                });
+                                }
                                 self.impling_types = Some(impls);
                             }