rust-warnings: fix warnings in tests
It turns out that I also missed those warnings inside tests. This should be the
last of them. One day we will get rid of this interface anyway.
Differential Revision: https://phab.mercurial-scm.org/D7678
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
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