Trait rustc::ty::fold::TypeFolder

pub trait TypeFolder<'gcx: 'tcx, 'tcx>: Sized {
    fn tcx<'a>(&'a self) -> TyCtxt<'a, 'gcx, 'tcx>;

    fn fold_binder<T>(&mut self, t: &Binder<T>) -> Binder<T>
    where
        T: TypeFoldable<'tcx>,
    { ... }
    fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> { ... }
    fn fold_region(&mut self, r: Region<'tcx>) -> Region<'tcx> { ... }
    fn fold_const(&mut self, c: &'tcx Const<'tcx>) -> &'tcx Const<'tcx> { ... }
}

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

The TypeFolder trait defines the actual folding. There is a method defined for every foldable type. Each of these has a default implementation that does an "identity" fold. Within each identity fold, it should invoke foo.fold_with(self) to fold each sub-item.

Required Methods

fn tcx<'a>(&'a self) -> TyCtxt<'a, 'gcx, 'tcx>

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Provided Methods

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

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Implementors

• impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for OpportunisticTypeResolver<'a, 'gcx, 'tcx>
• impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for OpportunisticTypeAndRegionResolver<'a, 'gcx, 'tcx>
• impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for TypeFreshener<'a, 'gcx, 'tcx>
• impl<'a, 'gcx, 'tcx, F> TypeFolder<'gcx, 'tcx> for BottomUpFolder<'a, 'gcx, 'tcx, F> where
    F: FnMut(Ty<'tcx>) -> Ty<'tcx>, 
• impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for RegionFolder<'a, 'gcx, 'tcx>