Trait rustc_middle::ty::fold::TypeFolder

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pub trait TypeFolder<I>: FallibleTypeFolder<I, Error = !>
where I: Interner,
{ // Required method fn interner(&self) -> I; // Provided methods fn fold_binder<T>(&mut self, t: Binder<I, T>) -> Binder<I, T> where T: TypeFoldable<I> { ... } fn fold_ty(&mut self, t: <I as Interner>::Ty) -> <I as Interner>::Ty { ... } fn fold_region( &mut self, r: <I as Interner>::Region, ) -> <I as Interner>::Region { ... } fn fold_const( &mut self, c: <I as Interner>::Const, ) -> <I as Interner>::Const { ... } fn fold_predicate( &mut self, p: <I as Interner>::Predicate, ) -> <I as Interner>::Predicate { ... } }
Expand description

This trait is implemented for every infallible folding traversal. There is a fold method defined for every type of interest. Each such method has a default that does an “identity” fold. Implementations of these methods often fall back to a super_fold_with method if the primary argument doesn’t satisfy a particular condition.

A blanket implementation of FallibleTypeFolder will defer to the infallible methods of this trait to ensure that the two APIs are coherent.

Required Methods§

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fn interner(&self) -> I

Provided Methods§

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fn fold_binder<T>(&mut self, t: Binder<I, T>) -> Binder<I, T>
where T: TypeFoldable<I>,

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fn fold_ty(&mut self, t: <I as Interner>::Ty) -> <I as Interner>::Ty

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

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fn fold_const(&mut self, c: <I as Interner>::Const) -> <I as Interner>::Const

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

Object Safety§

This trait is not object safe.

Implementors§

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impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for rustc_middle::ty::print::pretty::RegionFolder<'a, 'tcx>

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impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for rustc_middle::ty::fold::RegionFolder<'a, 'tcx>

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impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RegionEraserVisitor<'tcx>

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impl<'tcx> TypeFolder<TyCtxt<'tcx>> for NormalizeAfterErasingRegionsFolder<'tcx>

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impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ReverseMapper<'tcx>

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impl<'tcx> TypeFolder<TyCtxt<'tcx>> for OpaqueTypeExpander<'tcx>

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impl<'tcx> TypeFolder<TyCtxt<'tcx>> for WeakAliasTypeExpander<'tcx>

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impl<'tcx, D> TypeFolder<TyCtxt<'tcx>> for BoundVarReplacer<'tcx, D>
where D: BoundVarReplacerDelegate<'tcx>,

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impl<'tcx, F, G, H> TypeFolder<TyCtxt<'tcx>> for BottomUpFolder<'tcx, F, G, H>
where F: FnMut(Ty<'tcx>) -> Ty<'tcx>, G: FnMut(Region<'tcx>) -> Region<'tcx>, H: FnMut(Const<'tcx>) -> Const<'tcx>,