in which we decline to suggest the anonymous lifetime in declarations #61679
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rust-highfive
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oli-obk
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src/librustc/hir/lowering.rs
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| if let hir::TyKind::TraitObject(..) = ty.node { | ||
| self.maybe_lint_bare_trait(t.span, t.id, qself.is_none() && path.is_global()); | ||
| } | ||
| let ty = self.lower_path_ty(t, qself, path, ParamMode::Explicit, itctx); |
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nit: directly return here instead of using an intermediate variable
oli-obk
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| ); | ||
| P(t) | ||
| } else { | ||
| self.lower_ty(&f.ty, ImplTraitContext::disallowed()) |
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alternatively you could add a ParamMode argument to lower_ty, not sure if that is better though
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That was my first idea, but I decided against it, because it seemed inelegant to change the signature when most of the TyKind match arm bodies don't concern themselves with ParamMode.
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r=me with nits addressed |
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The elided-lifetimes-in-path lint (part of our suite of Rust 2018 idiom lints which we are hoping to promote to Warn status) was firing with an illegal suggestion to write an anonymous lifetime in a struct/item declaration (where we don't allow it). The linting code was already deciding whether to act on the basis of a `ParamMode` enum, indicating whether the present path-segment was part of an expression, or anywhere else. The present case seemed to be part of the "anywhere else", and yet meriting different rules as far as the lint was concerned, so it seemed expedient to introduce a new enum member. We yank out a `TyKind::Path` arm into its own method so that we can call it with our new `ParamMode` specifically when lowering struct fields. (The alternative strategy of changing the signature of `lower_ty` to take a `ParamMode` would be inelegant given that most of the `TyKind` match arm bodies therein don't concern themselves with `ParamMode`.) Resolves rust-lang#61124.
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@bors r=oli-obk |
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📌 Commit 7a3184a has been approved by |
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…ifetime, r=oli-obk in which we decline to suggest the anonymous lifetime in declarations The elided-lifetimes-in-path lint (part of our suite of Rust 2018 idiom lints which we are hoping to promote to Warn status) was firing with an illegal suggestion to write an anonymous lifetime in a struct/item declaration (where we don't allow it). The linting code was already deciding whether to act on the basis of a `ParamMode` enum, indicating whether the present path-segment was part of an expression, or anywhere else. The present case seemed to be part of the "anywhere else", and yet meriting different rules as far as the lint was concerned, so it seemed expedient to introduce a new enum member. We yank out `TyKind::Path` arm into its own method so that we can call it with our new `ParamMode` specifically when lowering struct fields—one would have hoped to think of something more elegant than this, but it definitely beats changing the signature of `lower_ty` to take a `ParamMode`! Resolves #61124. cc @memoryruins r? @oli-obk
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☀️ Test successful - checks-travis, status-appveyor |
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…fmease Remove `ParamMode::ExplicitNamed` This was introduced as a hack to improve a diagnostics suggestion in rust-lang#61679. It was subsequently broken, but also it was an incomplete hack that I don't believe we need to support, so let's just remove it.
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…fmease Remove `ParamMode::ExplicitNamed` This was introduced as a hack to improve a diagnostics suggestion in rust-lang#61679. It was subsequently broken, but also it was an incomplete hack that I don't believe we need to support, so let's just remove it.
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Rollup merge of rust-lang#129626 - compiler-errors:explicit-named, r=fmease Remove `ParamMode::ExplicitNamed` This was introduced as a hack to improve a diagnostics suggestion in rust-lang#61679. It was subsequently broken, but also it was an incomplete hack that I don't believe we need to support, so let's just remove it.
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The elided-lifetimes-in-path lint (part of our suite of Rust 2018 idiom lints which we are hoping to promote to Warn status) was firing with an illegal suggestion to write an anonymous lifetime in a
struct/item declaration (where we don't allow it). The linting code was already deciding whether to act on the basis of a
ParamModeenum, indicating whether the present path-segment was part of anexpression, or anywhere else. The present case seemed to be part of the "anywhere else", and yet meriting different rules as far as the lint was concerned, so it seemed expedient to introduce a new enum member. We yank out
TyKind::Patharm into its own method so that we can call it with our newParamModespecifically when lowering struct fields—one would have hoped to think of something more elegant than this, but it definitely beats changing the signature oflower_tyto take aParamMode!Resolves #61124.
cc @memoryruins
r? @oli-obk