rust-chg: have attach_io() simply take reference of AsRawFd object
We no longer have to deal with the restriction of the Future type.
Before, these file objects couldn't be references and that's the only
reason why we had to make stderr an Option<T>.
This fixes future type deduction issue of stderr = None, where rustc would
complain that T of Option<T> couldn't be deduced.
Differential Revision: https://phab.mercurial-scm.org/D8443
rust-status: check for '.hg' regardless of file type (
issue6300)
'.hg' would show up in `hg status` if were a symlink.
Differential Revision: https://phab.mercurial-scm.org/D8461
rust: remove extra empty line
This is a gratuitous cleanup.
Differential Revision: https://phab.mercurial-scm.org/D8460