new lint: mutable_key_type This fixes #732 - well, partly, it doesn't adress `Hash` impls, but the use of mutable types as map keys or set members changelog: add `mutable_key_type` lint r? @flip1995
new lint: mutable_key_type This fixes #732 - well, partly, it doesn't adress `Hash` impls, but the use of mutable types as map keys or set members changelog: add `mutable_key_type` lint r? @flip1995