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Auto merge of #78177 - benjaminp:cleanups, r=jyn514

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A few miscellaneous comment fixes and a tiny code clarification.
This commit is contained in:
bors 2020-12-04 07:11:41 +00:00
commit e6225434ff
4 changed files with 20 additions and 25 deletions
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6
compiler/rustc_infer/src/infer/higher_ranked/mod.rs
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@ -24,9 +24,9 @@ impl<'a, 'tcx> CombineFields<'a, 'tcx> {
// as-is, we need to do some extra work here in order to make sure
// that function subtyping works correctly with respect to regions
//
// Note: this is a subtle algorithm. For a full explanation,
// please see the large comment at the end of the file in the (inlined) module
// `doc`.
// Note: this is a subtle algorithm. For a full explanation, please see
// the rustc dev guide:
// <https://rustc-dev-guide.rust-lang.org/borrow_check/region_inference/placeholders_and_universes.html>
let span = self.trace.cause.span;

24
compiler/rustc_typeck/src/bounds.rs
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@ -67,22 +67,18 @@ impl<'tcx> Bounds<'tcx> {
sized_predicate
.into_iter()
.chain(self.region_bounds.iter().map(|&(region_bound, span)| {
let outlives = ty::OutlivesPredicate(param_ty, region_bound);
(ty::Binder::bind(outlives).to_predicate(tcx), span)
}))
.chain(self.trait_bounds.iter().map(|&(bound_trait_ref, span, constness)| {
let predicate = bound_trait_ref.with_constness(constness).to_predicate(tcx);
(predicate, span)
}))
.chain(
self.region_bounds
self.projection_bounds
.iter()
.map(|&(region_bound, span)| {
let outlives = ty::OutlivesPredicate(param_ty, region_bound);
(ty::Binder::bind(outlives).to_predicate(tcx), span)
})
.chain(self.trait_bounds.iter().map(|&(bound_trait_ref, span, constness)| {
let predicate = bound_trait_ref.with_constness(constness).to_predicate(tcx);
(predicate, span)
}))
.chain(
self.projection_bounds
.iter()
.map(|&(projection, span)| (projection.to_predicate(tcx), span)),
),
.map(|&(projection, span)| (projection.to_predicate(tcx), span)),
)
.collect()
}

13
compiler/rustc_typeck/src/check/method/probe.rs
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@ -765,13 +765,12 @@ impl<'a, 'tcx> ProbeContext<'a, 'tcx> {
)
});
// It is illegal to invoke a method on a trait instance that
// refers to the `Self` type. An error will be reported by
// `enforce_object_limitations()` if the method refers to the
// `Self` type anywhere other than the receiver. Here, we use
// a substitution that replaces `Self` with the object type
// itself. Hence, a `&self` method will wind up with an
// argument type like `&Trait`.
// It is illegal to invoke a method on a trait instance that refers to
// the `Self` type. An [`ObjectSafetyViolation::SupertraitSelf`] error
// will be reported by `object_safety.rs` if the method refers to the
// `Self` type anywhere other than the receiver. Here, we use a
// substitution that replaces `Self` with the object type itself. Hence,
// a `&self` method will wind up with an argument type like `&Trait`.
let trait_ref = principal.with_self_ty(self.tcx, self_ty);
self.elaborate_bounds(iter::once(trait_ref), |this, new_trait_ref, item| {
let new_trait_ref = this.erase_late_bound_regions(new_trait_ref);

2
compiler/rustc_typeck/src/check/writeback.rs
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@ -88,7 +88,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
}
///////////////////////////////////////////////////////////////////////////
// The Writeback context. This visitor walks the AST, checking the
// The Writeback context. This visitor walks the HIR, checking the
// fn-specific typeck results to find references to types or regions. It
// resolves those regions to remove inference variables and writes the
// final result back into the master typeck results in the tcx. Here and