diff options
| -rw-r--r-- | compiler/rustc_passes/src/check_const.rs | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/compiler/rustc_passes/src/check_const.rs b/compiler/rustc_passes/src/check_const.rs index 2405c632060..04d6e9f205a 100644 --- a/compiler/rustc_passes/src/check_const.rs +++ b/compiler/rustc_passes/src/check_const.rs @@ -98,7 +98,7 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) { .unwrap_or(false); if !is_implemented { - to_implement.push(tcx.item_name(trait_item_id).to_string()); + to_implement.push(trait_item_id); } } } @@ -106,13 +106,18 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) { // all nonconst trait functions (not marked with #[default_method_body_is_const]) // must be implemented if !to_implement.is_empty() { + let not_implemented = to_implement + .into_iter() + .map(|did| tcx.item_name(did).to_string()) + .collect::<Vec<_>>() + .join("`, `"); tcx .sess .struct_span_err( item.span, "const trait implementations may not use non-const default functions", ) - .note(&format!("`{}` not implemented", to_implement.join("`, `"))) + .note(&format!("`{}` not implemented", not_implemented)) .emit(); } } |