X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=clippy_lints%2Fsrc%2Fto_string_in_display.rs;h=4fb297ac6c6990771cc9ef935f76b2225901ed60;hb=5491c802c2f6b71070268310644577dd00726fa9;hp=c53727ba160046861e6d446e428482f5b0986837;hpb=9009f8f0319fb0f1a9ef712e6f379c2bfda2d101;p=rust.git

diff --git a/clippy_lints/src/to_string_in_display.rs b/clippy_lints/src/to_string_in_display.rs
index c53727ba160..4fb297ac6c6 100644
--- a/clippy_lints/src/to_string_in_display.rs
+++ b/clippy_lints/src/to_string_in_display.rs
@@ -1,9 +1,10 @@
-use crate::utils::{match_def_path, match_trait_method, paths, qpath_res, span_lint};
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::{is_diag_trait_item, match_def_path, path_to_local_id, paths};
 use if_chain::if_chain;
-use rustc_hir::def::Res;
 use rustc_hir::{Expr, ExprKind, HirId, Impl, ImplItem, ImplItemKind, Item, ItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::sym;
 
 declare_clippy_lint! {
     /// **What it does:** Checks for uses of `to_string()` in `Display` traits.
@@ -89,14 +90,13 @@ fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &ImplItem<'_>) {
 
     fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
         if_chain! {
-            if let ExprKind::MethodCall(ref path, _, args, _) = expr.kind;
-            if path.ident.name == sym!(to_string);
-            if match_trait_method(cx, expr, &paths::TO_STRING);
             if self.in_display_impl;
-            if let ExprKind::Path(ref qpath) = args[0].kind;
-            if let Res::Local(hir_id) = qpath_res(cx, qpath, args[0].hir_id);
             if let Some(self_hir_id) = self.self_hir_id;
-            if hir_id == self_hir_id;
+            if let ExprKind::MethodCall(path, _, args, _) = expr.kind;
+            if path.ident.name == sym!(to_string);
+            if let Some(expr_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
+            if is_diag_trait_item(cx, expr_def_id, sym::ToString);
+            if path_to_local_id(&args[0], self_hir_id);
             then {
                 span_lint(
                     cx,