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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| use rustc_ast::TraitObjectSyntax; | ||
| use rustc_errors::{Diagnostic, StashKey}; | ||
| use rustc_hir as hir; | ||
| use rustc_lint_defs::{builtin::BARE_TRAIT_OBJECTS, Applicability}; | ||
| use rustc_trait_selection::traits::error_reporting::suggestions::NextTypeParamName; | ||
|
|
||
| use super::AstConv; | ||
|
|
||
| impl<'o, 'tcx> dyn AstConv<'tcx> + 'o { | ||
| /// Make sure that we are in the condition to suggest the blanket implementation. | ||
| pub(super) fn maybe_lint_blanket_trait_impl( | ||
| &self, | ||
| self_ty: &hir::Ty<'_>, | ||
| diag: &mut Diagnostic, | ||
| ) { | ||
| let tcx = self.tcx(); | ||
| let parent_id = tcx.hir().get_parent_item(self_ty.hir_id).def_id; | ||
| if let hir::Node::Item(hir::Item { | ||
| kind: | ||
| hir::ItemKind::Impl(hir::Impl { | ||
| self_ty: impl_self_ty, of_trait: Some(of_trait_ref), generics, .. | ||
| }), | ||
| .. | ||
| }) = tcx.hir().get_by_def_id(parent_id) && self_ty.hir_id == impl_self_ty.hir_id | ||
| { | ||
| if !of_trait_ref.trait_def_id().is_some_and(|def_id| def_id.is_local()) { | ||
| return; | ||
| } | ||
| let of_trait_span = of_trait_ref.path.span; | ||
| // make sure that we are not calling unwrap to abort during the compilation | ||
| let Ok(impl_trait_name) = tcx.sess.source_map().span_to_snippet(self_ty.span) else { return; }; | ||
| let Ok(of_trait_name) = tcx.sess.source_map().span_to_snippet(of_trait_span) else { return; }; | ||
| // check if the trait has generics, to make a correct suggestion | ||
| let param_name = generics.params.next_type_param_name(None); | ||
|
|
||
| let add_generic_sugg = if let Some(span) = generics.span_for_param_suggestion() { | ||
| (span, format!(", {}: {}", param_name, impl_trait_name)) | ||
| } else { | ||
| (generics.span, format!("<{}: {}>", param_name, impl_trait_name)) | ||
| }; | ||
| diag.multipart_suggestion( | ||
| format!("alternatively use a blanket \ | ||
| implementation to implement `{of_trait_name}` for \ | ||
| all types that also implement `{impl_trait_name}`"), | ||
| vec![ | ||
| (self_ty.span, param_name), | ||
| add_generic_sugg, | ||
| ], | ||
| Applicability::MaybeIncorrect, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| pub(super) fn maybe_lint_bare_trait(&self, self_ty: &hir::Ty<'_>, in_path: bool) { | ||
| let tcx = self.tcx(); | ||
| if let hir::TyKind::TraitObject([poly_trait_ref, ..], _, TraitObjectSyntax::None) = | ||
| self_ty.kind | ||
| { | ||
| let needs_bracket = in_path | ||
| && !tcx | ||
| .sess | ||
| .source_map() | ||
| .span_to_prev_source(self_ty.span) | ||
| .ok() | ||
| .is_some_and(|s| s.trim_end().ends_with('<')); | ||
|
|
||
| let is_global = poly_trait_ref.trait_ref.path.is_global(); | ||
|
|
||
| let mut sugg = Vec::from_iter([( | ||
| self_ty.span.shrink_to_lo(), | ||
| format!( | ||
| "{}dyn {}", | ||
| if needs_bracket { "<" } else { "" }, | ||
| if is_global { "(" } else { "" }, | ||
| ), | ||
| )]); | ||
|
|
||
| if is_global || needs_bracket { | ||
| sugg.push(( | ||
| self_ty.span.shrink_to_hi(), | ||
| format!( | ||
| "{}{}", | ||
| if is_global { ")" } else { "" }, | ||
| if needs_bracket { ">" } else { "" }, | ||
| ), | ||
| )); | ||
| } | ||
|
|
||
| if self_ty.span.edition().rust_2021() { | ||
| let msg = "trait objects must include the `dyn` keyword"; | ||
| let label = "add `dyn` keyword before this trait"; | ||
| let mut diag = | ||
| rustc_errors::struct_span_err!(tcx.sess, self_ty.span, E0782, "{}", msg); | ||
| if self_ty.span.can_be_used_for_suggestions() { | ||
| diag.multipart_suggestion_verbose( | ||
| label, | ||
| sugg, | ||
| Applicability::MachineApplicable, | ||
| ); | ||
| } | ||
| // check if the impl trait that we are considering is a impl of a local trait | ||
| self.maybe_lint_blanket_trait_impl(&self_ty, &mut diag); | ||
| diag.stash(self_ty.span, StashKey::TraitMissingMethod); | ||
| } else { | ||
| let msg = "trait objects without an explicit `dyn` are deprecated"; | ||
| tcx.struct_span_lint_hir( | ||
| BARE_TRAIT_OBJECTS, | ||
| self_ty.hir_id, | ||
| self_ty.span, | ||
| msg, | ||
| |lint| { | ||
| lint.multipart_suggestion_verbose( | ||
| "use `dyn`", | ||
| sugg, | ||
| Applicability::MachineApplicable, | ||
| ); | ||
| self.maybe_lint_blanket_trait_impl(&self_ty, lint); | ||
| lint | ||
| }, | ||
| ); | ||
| } | ||
| } | ||
| } | ||
| } |
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