pub unsafe trait DerefPure { }🔬This is a nightly-only experimental API. (
deref_pure_trait)Expand description
Perma-unstable marker trait. Indicates that the type has a well-behaved Deref
(and, if applicable, DerefMut) implementation. This is relied on for soundness
of deref patterns.
FIXME(deref_patterns): The precise semantics are undecided; the rough idea is that
successive calls to deref/deref_mut without intermediate mutation should be
idempotent, in the sense that they return the same value as far as pattern-matching
is concerned. Calls to deref/deref_mut must leave the pointer itself likewise
unchanged.