Trait rustc_type_ir::fold::TypeSuperFoldable

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

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

Required Methods

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

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: TypeFolder<I>>(self, folder: &mut F) -> Self

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