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Simplify some iterator combinators

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This commit is contained in:
Michael Goulet 2022-12-10 20:31:01 +00:00
parent c7572670a1
commit 7690fe3bc6
12 changed files with 91 additions and 135 deletions
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23
compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
View file

@ -527,26 +527,21 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
// that are *partially* initialized by assigning to a field of an uninitialized
// binding. We differentiate between them for more accurate wording here.
"isn't fully initialized"
} else if spans
.iter()
.filter(|i| {
// We filter these to avoid misleading wording in cases like the following,
// where `x` has an `init`, but it is in the same place we're looking at:
// ```
// let x;
// x += 1;
// ```
!i.contains(span)
} else if !spans.iter().any(|i| {
// We filter these to avoid misleading wording in cases like the following,
// where `x` has an `init`, but it is in the same place we're looking at:
// ```
// let x;
// x += 1;
// ```
!i.contains(span)
// We filter these to avoid incorrect main message on `match-cfg-fake-edges.rs`
&& !visitor
.errors
.iter()
.map(|(sp, _)| *sp)
.any(|sp| span < sp && !sp.contains(span))
})
.count()
== 0
{
}) {
show_assign_sugg = true;
"isn't initialized"
} else {

50
compiler/rustc_borrowck/src/diagnostics/region_errors.rs
View file

@ -316,35 +316,29 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
// obligation comes from the `impl`. Find that `impl` so that we can point
// at it in the suggestion.
let trait_did = trait_did.to_def_id();
match tcx
.hir()
.trait_impls(trait_did)
.iter()
.filter_map(|&impl_did| {
match tcx.hir().get_if_local(impl_did.to_def_id()) {
Some(Node::Item(Item {
kind: ItemKind::Impl(hir::Impl { self_ty, .. }),
..
})) if trait_objects.iter().all(|did| {
// FIXME: we should check `self_ty` against the receiver
// type in the `UnifyReceiver` context, but for now, use
// this imperfect proxy. This will fail if there are
// multiple `impl`s for the same trait like
// `impl Foo for Box<dyn Bar>` and `impl Foo for dyn Bar`.
// In that case, only the first one will get suggestions.
let mut traits = vec![];
let mut hir_v = HirTraitObjectVisitor(&mut traits, *did);
hir_v.visit_ty(self_ty);
!traits.is_empty()
}) =>
{
Some(self_ty)
}
_ => None,
match tcx.hir().trait_impls(trait_did).iter().find_map(|&impl_did| {
match tcx.hir().get_if_local(impl_did.to_def_id()) {
Some(Node::Item(Item {
kind: ItemKind::Impl(hir::Impl { self_ty, .. }),
..
})) if trait_objects.iter().all(|did| {
// FIXME: we should check `self_ty` against the receiver
// type in the `UnifyReceiver` context, but for now, use
// this imperfect proxy. This will fail if there are
// multiple `impl`s for the same trait like
// `impl Foo for Box<dyn Bar>` and `impl Foo for dyn Bar`.
// In that case, only the first one will get suggestions.
let mut traits = vec![];
let mut hir_v = HirTraitObjectVisitor(&mut traits, *did);
hir_v.visit_ty(self_ty);
!traits.is_empty()
}) =>
{
Some(self_ty)
}
})
.next()
{
_ => None,
}
}) {
Some(self_ty) => Some((trait_item.ident, self_ty)),
_ => None,
}