Trait rustc_middle::ty::RefDecodable
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Trait for decoding to a reference.
This is a separate trait from Decodable
so that we can implement it for
upstream types, such as FxHashSet
.
The TyDecodable
derive macro will use this trait for fields that are
references (and don’t use a type alias to hide that).
Decodable
can still be implemented in cases where Decodable
is required
by a trait bound.