Trait rustc_middle::ty::fold::TypeFoldable

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pub trait TypeFoldable<'tcx>: Debug + Clone {

Show 26 methods    fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
        self, 
        folder: &mut F
    ) -> Result<Self, F::Error>;

    fn super_visit_with<V: TypeVisitor<'tcx>>(
        &self, 
        visitor: &mut V
    ) -> ControlFlow<V::BreakTy>;

    fn super_fold_with<F: TypeFolder<'tcx, Error = !>>(
        self, 
        folder: &mut F
    ) -> Self { ... }

    fn fold_with<F: TypeFolder<'tcx, Error = !>>(self, folder: &mut F) -> Self { ... }

    fn try_fold_with<F: FallibleTypeFolder<'tcx>>(
        self, 
        folder: &mut F
    ) -> Result<Self, F::Error> { ... }

    fn visit_with<V: TypeVisitor<'tcx>>(
        &self, 
        visitor: &mut V
    ) -> ControlFlow<V::BreakTy> { ... }

    fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool { ... }

    fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool { ... }

    fn has_escaping_bound_vars(&self) -> bool { ... }

    fn has_type_flags(&self, flags: TypeFlags) -> bool { ... }

    fn has_projections(&self) -> bool { ... }

    fn has_opaque_types(&self) -> bool { ... }

    fn references_error(&self) -> bool { ... }

    fn has_param_types_or_consts(&self) -> bool { ... }

    fn has_infer_regions(&self) -> bool { ... }

    fn has_infer_types(&self) -> bool { ... }

    fn has_infer_types_or_consts(&self) -> bool { ... }

    fn needs_infer(&self) -> bool { ... }

    fn has_placeholders(&self) -> bool { ... }

    fn needs_subst(&self) -> bool { ... }

    fn has_free_regions(&self) -> bool { ... }

    fn has_erased_regions(&self) -> bool { ... }

    fn has_erasable_regions(&self) -> bool { ... }

    fn is_global(&self) -> bool { ... }

    fn has_late_bound_regions(&self) -> bool { ... }

    fn still_further_specializable(&self) -> bool { ... }

}
Expand description

This trait is implemented for every type that can be folded. Basically, every type that has a corresponding method in TypeFolder.

To implement this conveniently, use the derive macro located in rustc_macros.

Required methods

Provided methods

Consumers may find this more convenient to use with infallible folders than try_super_fold_with, to which the provided default definition delegates. Implementors should not override this provided default definition, to ensure that the two methods are coherent (provide a definition of try_super_fold_with instead).

Consumers may find this more convenient to use with infallible folders than try_fold_with, to which the provided default definition delegates. Implementors should not override this provided default definition, to ensure that the two methods are coherent (provide a definition of try_fold_with instead).

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.

Returns true if this self has any regions that escape binder (and hence are not bound by it).

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.

True if there are any un-erased free regions.

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.

True if there are any late-bound regions

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.

Implementations on Foreign Types

Implementors

AdtDefs are basically the same as a DefId.