Struct rustc_middle::ty::visit::LateBoundRegionsCollector

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struct LateBoundRegionsCollector {
    current_index: DebruijnIndex,
    regions: FxHashSet<BoundRegionKind>,
    just_constrained: bool,
}
Expand description

Collects all the late-bound regions at the innermost binding level into a hash set.

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§current_index: DebruijnIndex§regions: FxHashSet<BoundRegionKind>§just_constrained: bool

true if we only want regions that are known to be “constrained” when you equate this type with another type. In particular, if you have e.g., &'a u32 and &'b u32, equating them constraints 'a == 'b. But if you have <&'a u32 as Trait>::Foo and <&'b u32 as Trait>::Foo, normalizing those types may mean that 'a and 'b don’t appear in the results, so they are not considered constrained.

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impl LateBoundRegionsCollector

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fn new(just_constrained: bool) -> Self

Trait Implementations§

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impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for LateBoundRegionsCollector

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fn visit_binder<T: TypeVisitable<TyCtxt<'tcx>>>(&mut self, t: &Binder<'tcx, T>)

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fn visit_ty(&mut self, t: Ty<'tcx>)

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fn visit_const(&mut self, c: Const<'tcx>)

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fn visit_region(&mut self, r: Region<'tcx>)

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type Result = ()

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fn visit_predicate(&mut self, p: <I as Interner>::Predicate) -> Self::Result

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fn visit_clauses(&mut self, p: <I as Interner>::Clauses) -> Self::Result

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fn visit_error( &mut self, _guar: <I as Interner>::ErrorGuaranteed, ) -> Self::Result

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

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fn borrow_mut(&mut self) -> &mut T

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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 40 bytes