rustc: Remove support for old_impl_check #23749
Merged
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This commit removes compiler support for the
old_impl_check
attribute whichshould in theory be entirely removed now. The last remaining use of it in the
standard library has been updated by moving the type parameter on the
old_io::Acceptor
trait into an associated type. As a result, this is abreaking change for all current users of the deprecated
old_io::Acceptor
trait. Code can be migrated by using the
Connection
associated type instead.[breaking-change]