Trait rustc_middle::ty::fold::TypeSuperFoldable

pub trait TypeSuperFoldable<I>: TypeFoldable<I>where
    I: Interner,{
    // Required method
    fn try_super_fold_with<F>(
        self,
        folder: &mut F
    ) -> Result<Self, <F as FallibleTypeFolder<I>>::Error>
       where F: FallibleTypeFolder<I>;

    // Provided method
    fn super_fold_with<F>(self, folder: &mut F) -> Self
       where F: TypeFolder<I> { ... }
}

Required Methods

fn try_super_fold_with<F>( self, folder: &mut F ) -> Result<Self, <F as FallibleTypeFolder<I>>::Error>where F: FallibleTypeFolder<I>,

Provides a default fold for a recursive type of interest. This should only be called within TypeFolder methods, when a non-custom traversal is desired for the value of the type of interest passed to that method. For example, in MyFolder::try_fold_ty(ty), it is valid to call ty.try_super_fold_with(self), but any other folding should be done with xyz.try_fold_with(self).

Provided Methods

fn super_fold_with<F>(self, folder: &mut F) -> Selfwhere F: TypeFolder<I>,

A convenient alternative to try_super_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_super_fold_with.

Implementors

impl<'tcx> TypeSuperFoldable<TyCtxt<'tcx>> for Const<'tcx>

impl<'tcx> TypeSuperFoldable<TyCtxt<'tcx>> for Predicate<'tcx>

impl<'tcx> TypeSuperFoldable<TyCtxt<'tcx>> for Ty<'tcx>

impl<'tcx, T: TypeFoldable<TyCtxt<'tcx>>> TypeSuperFoldable<TyCtxt<'tcx>> for Binder<'tcx, T>