if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id()), sym::String);
// Filters instances of to_string which are required by a trait
- if trait_ref_of_method(cx, impl_item.hir_id()).is_none();
+ if trait_ref_of_method(cx, impl_item.def_id).is_none();
then {
show_lint(cx, impl_item);