diff options
Diffstat (limited to 'clippy_lints/src/to_string_trait_impl.rs')
| -rw-r--r-- | clippy_lints/src/to_string_trait_impl.rs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/clippy_lints/src/to_string_trait_impl.rs b/clippy_lints/src/to_string_trait_impl.rs index e1cea99085f..59ae185c9de 100644 --- a/clippy_lints/src/to_string_trait_impl.rs +++ b/clippy_lints/src/to_string_trait_impl.rs @@ -1,4 +1,5 @@ use clippy_utils::diagnostics::span_lint_and_help; +use clippy_utils::ty::implements_trait; use rustc_hir::{Impl, Item, ItemKind}; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::declare_lint_pass; @@ -53,6 +54,8 @@ impl<'tcx> LateLintPass<'tcx> for ToStringTraitImpl { }) = it.kind && let Some(trait_did) = trait_ref.trait_def_id() && cx.tcx.is_diagnostic_item(sym::ToString, trait_did) + && let Some(display_did) = cx.tcx.get_diagnostic_item(sym::Display) + && !implements_trait(cx, cx.tcx.type_of(it.owner_id).instantiate_identity(), display_did, &[]) { span_lint_and_help( cx, |