diff options
| -rw-r--r-- | compiler/rustc_hir_typeck/src/method/suggest.rs | 77 | ||||
| -rw-r--r-- | tests/ui/suggestions/issue-99597.rs | 15 | ||||
| -rw-r--r-- | tests/ui/suggestions/issue-99597.stderr | 15 |
3 files changed, 76 insertions, 31 deletions
diff --git a/compiler/rustc_hir_typeck/src/method/suggest.rs b/compiler/rustc_hir_typeck/src/method/suggest.rs index 486c217707e..550a87e6102 100644 --- a/compiler/rustc_hir_typeck/src/method/suggest.rs +++ b/compiler/rustc_hir_typeck/src/method/suggest.rs @@ -2633,47 +2633,62 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { Nothing, } let ast_generics = hir.get_generics(id.owner.def_id).unwrap(); - let (sp, mut introducer) = if let Some(span) = - ast_generics.bounds_span_for_suggestions(def_id) - { - (span, Introducer::Plus) - } else if let Some(colon_span) = param.colon_span { - (colon_span.shrink_to_hi(), Introducer::Nothing) - } else { - (param.span.shrink_to_hi(), Introducer::Colon) - }; - if matches!( - param.kind, - hir::GenericParamKind::Type { synthetic: true, .. }, - ) { - introducer = Introducer::Plus - } let trait_def_ids: FxHashSet<DefId> = ast_generics .bounds_for_param(def_id) .flat_map(|bp| bp.bounds.iter()) .filter_map(|bound| bound.trait_ref()?.trait_def_id()) .collect(); - if !candidates.iter().any(|t| trait_def_ids.contains(&t.def_id)) { - err.span_suggestions( - sp, - message(format!( - "restrict type parameter `{}` with", - param.name.ident(), - )), + if candidates.iter().any(|t| trait_def_ids.contains(&t.def_id)) { + return; + } + let msg = message(format!( + "restrict type parameter `{}` with", + param.name.ident(), + )); + let bounds_span = ast_generics.bounds_span_for_suggestions(def_id); + if rcvr_ty.is_ref() && param.is_impl_trait() && bounds_span.is_some() { + err.multipart_suggestions( + msg, candidates.iter().map(|t| { - format!( - "{} {}", - match introducer { - Introducer::Plus => " +", - Introducer::Colon => ":", - Introducer::Nothing => "", - }, - self.tcx.def_path_str(t.def_id), - ) + vec![ + (param.span.shrink_to_lo(), "(".to_string()), + ( + bounds_span.unwrap(), + format!(" + {})", self.tcx.def_path_str(t.def_id)), + ), + ] }), Applicability::MaybeIncorrect, ); + return; } + + let (sp, introducer) = if let Some(span) = bounds_span { + (span, Introducer::Plus) + } else if let Some(colon_span) = param.colon_span { + (colon_span.shrink_to_hi(), Introducer::Nothing) + } else if param.is_impl_trait() { + (param.span.shrink_to_hi(), Introducer::Plus) + } else { + (param.span.shrink_to_hi(), Introducer::Colon) + }; + + err.span_suggestions( + sp, + msg, + candidates.iter().map(|t| { + format!( + "{} {}", + match introducer { + Introducer::Plus => " +", + Introducer::Colon => ":", + Introducer::Nothing => "", + }, + self.tcx.def_path_str(t.def_id) + ) + }), + Applicability::MaybeIncorrect, + ); return; } Node::Item(hir::Item { diff --git a/tests/ui/suggestions/issue-99597.rs b/tests/ui/suggestions/issue-99597.rs new file mode 100644 index 00000000000..8ba9e1fdd62 --- /dev/null +++ b/tests/ui/suggestions/issue-99597.rs @@ -0,0 +1,15 @@ +#![allow(dead_code)] + +trait T1 { } + +trait T2 { + fn test(&self) { } +} + +fn go(s: &impl T1) { + //~^ SUGGESTION ( + s.test(); + //~^ ERROR no method named `test` +} + +fn main() { } diff --git a/tests/ui/suggestions/issue-99597.stderr b/tests/ui/suggestions/issue-99597.stderr new file mode 100644 index 00000000000..bdf2a07c143 --- /dev/null +++ b/tests/ui/suggestions/issue-99597.stderr @@ -0,0 +1,15 @@ +error[E0599]: no method named `test` found for reference `&impl T1` in the current scope + --> $DIR/issue-99597.rs:11:7 + | +LL | s.test(); + | ^^^^ method not found in `&impl T1` + | + = help: items from traits can only be used if the type parameter is bounded by the trait +help: the following trait defines an item `test`, perhaps you need to restrict type parameter `impl T1` with it: + | +LL | fn go(s: &(impl T1 + T2)) { + | + +++++ + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0599`. |