Expand description
Encapsulates the concrete representation of core types such as types and goals.
Traits
Implemented by types that have an associated interner (which
are virtually all of the types in chalk-ir, for example).
This lets us map from a type like Ty<I> to the parameter I.
A “interner” encapsulates the concrete representation of
certain “core types” from chalk-ir. All the types in chalk-ir are
parameterized by a I: Interner, and so (e.g.) if they want to
store a type, they don’t store a Ty<I> instance directly, but
rather prefer a Ty<I>. You can think of I::Type as the
interned representation (and, indeed, it may well be an interned
pointer, e.g. in rustc).