diff options
Diffstat (limited to 'compiler/rustc_infer/src')
6 files changed, 35 insertions, 13 deletions
diff --git a/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs b/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs index 6781fbc95c0..8a60b196e5e 100644 --- a/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs +++ b/compiler/rustc_infer/src/infer/canonical/canonicalizer.rs @@ -505,7 +505,7 @@ impl<'cx, 'tcx> Canonicalizer<'cx, 'tcx> { let canon_value = Canonical { max_universe: ty::UniverseIndex::ROOT, variables: List::empty(), - value: value.clone(), + value, }; return canon_value; } diff --git a/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs b/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs index fd8f46a6926..373f0a602c0 100644 --- a/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs +++ b/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs @@ -124,6 +124,11 @@ impl<'a, 'tcx> Visitor<'tcx> for FindHirNodeVisitor<'a, 'tcx> { return; } } + + // FIXME(const_generics): Currently, any uninferred `const` generics arguments + // are handled specially, but instead they should be handled in `annotate_method_call`, + // which currently doesn't work because this evaluates to `false` for const arguments. + // See https://github.com/rust-lang/rust/pull/77758 for more details. if self.node_ty_contains_target(expr.hir_id).is_some() { match expr.kind { ExprKind::Closure(..) => self.found_closure = Some(&expr), @@ -345,11 +350,6 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> { ) -> DiagnosticBuilder<'tcx> { let arg = self.resolve_vars_if_possible(arg); let arg_data = self.extract_inference_diagnostics_data(arg, None); - let kind_str = match arg.unpack() { - GenericArgKind::Type(_) => "type", - GenericArgKind::Const(_) => "the value", - GenericArgKind::Lifetime(_) => bug!("unexpected lifetime"), - }; let mut local_visitor = FindHirNodeVisitor::new(&self, arg, span); let ty_to_string = |ty: Ty<'tcx>| -> String { @@ -618,6 +618,28 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> { .any(|span_label| span_label.label.is_some() && span_label.span == span) && local_visitor.found_arg_pattern.is_none() { + let (kind_str, const_value) = match arg.unpack() { + GenericArgKind::Type(_) => ("type", None), + GenericArgKind::Const(_) => ("the value", Some(())), + GenericArgKind::Lifetime(_) => bug!("unexpected lifetime"), + }; + + // FIXME(const_generics): we would like to handle const arguments + // as part of the normal diagnostics flow below, but there appear to + // be subtleties in doing so, so for now we special-case const args + // here. + if let Some(suggestion) = const_value + .and_then(|_| arg_data.parent_name.as_ref()) + .map(|parent| format!("{}::<{}>", parent, arg_data.name)) + { + err.span_suggestion_verbose( + span, + "consider specifying the const argument", + suggestion, + Applicability::MaybeIncorrect, + ); + } + // Avoid multiple labels pointing at `span`. err.span_label( span, diff --git a/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/different_lifetimes.rs b/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/different_lifetimes.rs index 59786059fae..cdd68d83f22 100644 --- a/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/different_lifetimes.rs +++ b/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/different_lifetimes.rs @@ -121,7 +121,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { (Some(ret_span), _) => { let sup_future = self.future_return_type(scope_def_id_sup); - let (return_type, action) = if let Some(_) = sup_future { + let (return_type, action) = if sup_future.is_some() { ("returned future", "held across an await point") } else { ("return type", "returned") @@ -140,7 +140,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { } (_, Some(ret_span)) => { let sub_future = self.future_return_type(scope_def_id_sub); - let (return_type, action) = if let Some(_) = sub_future { + let (return_type, action) = if sub_future.is_some() { ("returned future", "held across an await point") } else { ("return type", "returned") diff --git a/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/util.rs b/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/util.rs index 8d0100440a8..61fad8863e7 100644 --- a/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/util.rs +++ b/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/util.rs @@ -131,7 +131,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { } pub(super) fn asyncness(&self, local_def_id: LocalDefId) -> Option<hir::IsAsync> { - // similar to the asyncness fn in rustc_ty::ty + // similar to the asyncness fn in rustc_ty_utils::ty let hir_id = self.tcx().hir().local_def_id_to_hir_id(local_def_id); let node = self.tcx().hir().get(hir_id); let fn_like = rustc_middle::hir::map::blocks::FnLikeNode::from_node(node)?; diff --git a/compiler/rustc_infer/src/infer/higher_ranked/mod.rs b/compiler/rustc_infer/src/infer/higher_ranked/mod.rs index 9d9ecf5b384..39043980dc4 100644 --- a/compiler/rustc_infer/src/infer/higher_ranked/mod.rs +++ b/compiler/rustc_infer/src/infer/higher_ranked/mod.rs @@ -24,9 +24,9 @@ impl<'a, 'tcx> CombineFields<'a, 'tcx> { // as-is, we need to do some extra work here in order to make sure // that function subtyping works correctly with respect to regions // - // Note: this is a subtle algorithm. For a full explanation, - // please see the large comment at the end of the file in the (inlined) module - // `doc`. + // Note: this is a subtle algorithm. For a full explanation, please see + // the rustc dev guide: + // <https://rustc-dev-guide.rust-lang.org/borrow_check/region_inference/placeholders_and_universes.html> let span = self.trace.cause.span; diff --git a/compiler/rustc_infer/src/traits/util.rs b/compiler/rustc_infer/src/traits/util.rs index b0b0e4372b8..8273c2d291d 100644 --- a/compiler/rustc_infer/src/traits/util.rs +++ b/compiler/rustc_infer/src/traits/util.rs @@ -309,7 +309,7 @@ impl<'tcx, I: Iterator<Item = PredicateObligation<'tcx>>> Iterator for FilterToT fn next(&mut self) -> Option<ty::PolyTraitRef<'tcx>> { while let Some(obligation) = self.base_iterator.next() { if let Some(data) = obligation.predicate.to_opt_poly_trait_ref() { - return Some(data); + return Some(data.value); } } None |