pub struct RegionFolder<'a, 'tcx> {
    tcx: TyCtxt<'tcx>,
    current_index: DebruijnIndex,
    fold_region_fn: &'a mut (dyn FnMut(Region<'tcx>, DebruijnIndex) -> Region<'tcx> + 'a),
}
Expand description

Folds over the substructure of a type, visiting its component types and all regions that occur free within it.

That is, Ty can contain function or method types that bind regions at the call site (ReLateBound), and occurrences of regions (aka “lifetimes”) that are bound within a type are not visited by this folder; only regions that occur free will be visited by fld_r.

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§tcx: TyCtxt<'tcx>§current_index: DebruijnIndex

Stores the index of a binder just outside the stuff we have visited. So this begins as INNERMOST; when we pass through a binder, it is incremented (via shift_in).

§fold_region_fn: &'a mut (dyn FnMut(Region<'tcx>, DebruijnIndex) -> Region<'tcx> + 'a)

Callback invokes for each free region. The DebruijnIndex points to the binder just outside the ones we have passed through.

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impl<'a, 'tcx> RegionFolder<'a, 'tcx>

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pub fn new( tcx: TyCtxt<'tcx>, fold_region_fn: &'a mut dyn FnMut(Region<'tcx>, DebruijnIndex) -> Region<'tcx> ) -> RegionFolder<'a, 'tcx>

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impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for RegionFolder<'a, 'tcx>

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fn interner(&self) -> TyCtxt<'tcx>

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fn fold_binder<T: TypeFoldable<TyCtxt<'tcx>>>( &mut self, t: Binder<'tcx, T> ) -> Binder<'tcx, T>

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

Auto Trait Implementations§

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impl<'a, 'tcx> !RefUnwindSafe for RegionFolder<'a, 'tcx>

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impl<'a, 'tcx> !Send for RegionFolder<'a, 'tcx>

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impl<'a, 'tcx> !Sync for RegionFolder<'a, 'tcx>

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impl<'a, 'tcx> Unpin for RegionFolder<'a, 'tcx>

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impl<'a, 'tcx> !UnwindSafe for RegionFolder<'a, 'tcx>

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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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) -> Rwhere 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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impl<I, F> FallibleTypeFolder<I> for Fwhere I: Interner, F: TypeFolder<I>,

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type Error = !

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fn interner(&self) -> I

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fn try_fold_binder<T>( &mut self, t: <I as Interner>::Binder<T> ) -> Result<<I as Interner>::Binder<T>, !>where T: TypeFoldable<I>, <I as Interner>::Binder<T>: TypeSuperFoldable<I>,

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fn try_fold_ty( &mut self, t: <I as Interner>::Ty ) -> Result<<I as Interner>::Ty, !>where <I as Interner>::Ty: TypeSuperFoldable<I>,

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fn try_fold_region( &mut self, r: <I as Interner>::Region ) -> Result<<I as Interner>::Region, !>

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fn try_fold_const( &mut self, c: <I as Interner>::Const ) -> Result<<I as Interner>::Const, !>where <I as Interner>::Const: TypeSuperFoldable<I>,

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fn try_fold_predicate( &mut self, p: <I as Interner>::Predicate ) -> Result<<I as Interner>::Predicate, !>where <I as Interner>::Predicate: TypeSuperFoldable<I>,

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<Tcx, T> Value<Tcx> for Twhere Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle: &[QueryInfo], _guar: ErrorGuaranteed ) -> T

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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: 32 bytes