Recover from function pointer types with generic parameter list #104223
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cc @davidtwco, @compiler-errors, @JohnTitor, @estebank, @TaKO8Ki |
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…s, r=estebank Recover from function pointer types with generic parameter list Give a more helpful error when encountering function pointer types with a generic parameter list like `fn<'a>(&'a str) -> bool` or `fn<T>(T) -> T` and suggest moving lifetime parameters to a `for<>` parameter list. I've added a bunch of extra code to properly handle (unlikely?) corner cases like `for<'a> fn<'b>()` (where there already exists a `for<>` parameter list) correctly suggesting `for<'a, 'b> fn()` (merging the lists). If you deem this useless, I can simplify the code by suggesting nothing at all in this case. I am quite open to suggestions regarding the wording of the diagnostic messages. Fixes rust-lang#103487. `@rustbot` label A-diagnostics r? diagnostics
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…iaskrgr Rollup of 11 pull requests Successful merges: - rust-lang#101967 (Move `unix_socket_abstract` feature API to `SocketAddrExt`.) - rust-lang#102470 (Stabilize const char convert) - rust-lang#104223 (Recover from function pointer types with generic parameter list) - rust-lang#104229 (Don't print full paths in overlap errors) - rust-lang#104294 (Don't ICE with inline const errors during MIR build) - rust-lang#104332 (Fixed some `_i32` notation in `maybe_uninit`’s doc) - rust-lang#104349 (fix some typos in comments) - rust-lang#104350 (Fix x finding Python on Windows) - rust-lang#104356 (interpret: make check_mplace public) - rust-lang#104364 (rustdoc: Resolve doc links in external traits having local impls) - rust-lang#104378 (Bump chalk to v0.87) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Give a more helpful error when encountering function pointer types with a generic parameter list like
fn<'a>(&'a str) -> boolorfn<T>(T) -> Tand suggest moving lifetime parameters to afor<>parameter list.I've added a bunch of extra code to properly handle (unlikely?) corner cases like
for<'a> fn<'b>()(where there already exists afor<>parameter list) correctly suggestingfor<'a, 'b> fn()(merging the lists). If you deem this useless, I can simplify the code by suggesting nothing at all in this case.I am quite open to suggestions regarding the wording of the diagnostic messages.
Fixes #103487.
@rustbot label A-diagnostics
r? diagnostics