Trait rustc_middle::ty::visit::TypeVisitable

source · 
pub trait TypeVisitable<'tcx>: Debug + Clone {

Show 22 methods    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 error_reported(&self) -> Result<(), ErrorGuaranteed> { ... }
    fn has_non_region_param(&self) -> bool { ... }
    fn has_infer_regions(&self) -> bool { ... }
    fn has_infer_types(&self) -> bool { ... }
    fn has_non_region_infer(&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 visited, providing the skeleton of the traversal.

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

Required Methods§

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

For most types, this just traverses the value, calling visit_with on each field/element.

For types of interest (such as Ty), the implementation of this method that calls a visitor method specifically for that type (such as V::visit_ty). This is where control transfers from TypeFoldable to TypeVisitor.

Provided Methods§

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 type has any regions that escape binder (and hence are not bound by it).

Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former.

See HasEscapingVarsVisitor for more information.

“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§