Module rustc_middle::ty::sty
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This module contains TyKind and its major components.
Structs
Binder is a binder for higher-ranked lifetimes or types. It is part of the
compiler’s representation for things like
for<'a> Fn(&'a isize)
(which would be represented by the type PolyTraitRef == Binder<'tcx, TraitRef>). Note that when we instantiate,
erase, or otherwise “discharge” these bound vars, we change the
type from Binder<'tcx, T> to just T (see
e.g., liberate_late_bound_regions).A closure can be modeled as a struct that looks like:
Struct returned by
split().A
const variable ID.A
ProjectionPredicate for an ExistentialTraitRef.An existential reference to a trait, where
Self is erased.
For example, the trait object Trait<'a, 'b, X, Y> is:Signature of a function type, which we have arbitrarily
decided to use to refer to the input/output types.
A “free” region
fr can be interpreted as “some region
at least as big as the scope fr.scope”.Similar to
ClosureSubsts; see the above documentation for more.An inline const is modeled like
Struct returned by
split().Represents the projection of an associated type. In explicit UFCS
form this would be written
<T as Trait<..>>::N.Use this rather than
RegionKind, whenever possible.A region (lifetime) variable ID.
A complete reference to a trait. These take numerous guises in syntax,
but perhaps the most recognizable form is in a where-clause:
Enums
Extra information about why we ended up with a particular variance.
This is only used to add more information to error messages, and
has no effect on soundness. While choosing the ‘wrong’
VarianceDiagInfo
may lead to confusing notes in error messages, it will never cause
a miscompilation or unsoundness.