Modify existing bounds if they exist #107555
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| .map(|id| (id, hir.local_def_id_to_hir_id(id))) | ||
| .and_then(|(local_id, hir_id)| tcx.hir().find_parent(hir_id).map(|node| (local_id, node))); | ||
| if let Some((local_id, generics)) = parent.as_ref() | ||
| .and_then(|(local_id, node)| node.generics().map(|generics| (local_id, generics))) |
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There's gotta be a way to simplify this, perhaps by avoiding these combinators... Could you maybe make this logic a bit simpler?
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Couldn't get rid of an and_then, but does this look cleaner to you?
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compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs
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| .filter_map(|bound| { | ||
| let bound_trait_path = bound.trait_ref()?.path; | ||
| let def_id = bound_trait_path.res.opt_def_id()?; | ||
| let generic_args = bound_trait_path.segments.iter().last().map(|path| path.args()); | ||
| (def_id == trait_ref.def_id).then_some((bound_trait_path.span, generic_args)) | ||
| }) |
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What happens if we have like...
T: Trait<A> + Trait<B>
and then we suggest to restrict T: Trait<B, Output = C>
What will that do?
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Wouldn't the associated type prevent multiple trait impls on the same type anyways? So Trait<A> + Trait<B> would error for other reasons before suggesting to constrain the bounds?
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e.g.
trait Foo<T> {
type Output;
fn bar() -> Self::Output;
}
fn test<T>() -> i32 where T: Foo<()>, T: Foo<i32> {
<T as Foo<()>>::bar()
}
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But I guess that already suggests .. , Output = i32> correctly
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Anywho @bors r+ rollup |
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…suggestion, r=compiler-errors Modify existing bounds if they exist Fixes rust-lang#107335. This implementation is kinda gross but I don't really see a better way to do it. This primarily does two things: Modifies `suggest_constraining_type_param` to accept a new parameter that indicates a span to be replaced instead of added, if presented, and limit the additive suggestions to either suggest a new bound on an existing bound (see newly added unit test) or add the generics argument if a generics argument wasn't found. The former change is required to retain the capability to add an entirely new bounds if it was entirely omitted. r? `@compiler-errors`
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#100599 (Add compiler error E0523 long description and test) - rust-lang#107471 (rustdoc: do not include empty default-settings tag in HTML) - rust-lang#107555 (Modify existing bounds if they exist) - rust-lang#107662 (Turn projections into copies in CopyProp.) - rust-lang#107695 (Add test for Future inflating arg size to 3x ) - rust-lang#107700 (Run the tools builder on all PRs) - rust-lang#107706 (Mark 'atomic_mut_ptr' methods const) - rust-lang#107709 (Fix problem noticed in PR106859 with char -> u8 suggestion) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Fixes #107335.
This implementation is kinda gross but I don't really see a better way to do it.
This primarily does two things: Modifies
suggest_constraining_type_paramto accept a new parameter that indicates a span to be replaced instead of added, if presented, and limit the additive suggestions to either suggest a new bound on an existing bound (see newly added unit test) or add the generics argument if a generics argument wasn't found.The former change is required to retain the capability to add an entirely new bounds if it was entirely omitted.
r? @compiler-errors