Make impl_trait_redundant_captures suggestion remove adjacent +
Closesrust-lang/rust#143216
The `impl_trait_redundant_captures` lint's machine-applicable suggestion only
spanned the `use<...>` syntax itself, leaving the adjacent `+` joiner behind.
Applying the suggestion produced uncompilable code, e.g.
`impl Sized + use<>` becoming `impl Sized + ` (stray trailing `+`).
This extends the removal span to also cover one adjacent `+`, preserving
valid syntax in the three bound-list positions covered by the regression test:
- `impl Sized + use<>` becomes `impl Sized`
- `impl use<> + Sized` becomes `impl Sized`
- `impl Sized + use<> + Send` becomes `impl Sized + Send`
A `//@ run-rustfix` UI test exercises all three positions, so the
rustfix-applied output is actually compiled — covering the gap the
existing `redundant.rs` test left (which only checks lint firing, not
suggestion correctness).
Tested:
- ./x test tests/ui/impl-trait/precise-capturing/redundant-machine-applicable.rs --bless
- ./x test tidy
Jacob Pratt
794b44de55