tests/test-check-rust-format.t

rebase: delete unused p1 argument to _concludenode()

Unused since a0192a03216d (rebase: remove now unnecessary logic to
allow empty commit when branch changes, 2020-07-09).

Differential Revision: https://phab.mercurial-scm.org/D9055

#require rustfmt test-repo

  $ . "$TESTDIR/helpers-testrepo.sh"

  $ cd "$TESTDIR"/..
  $ RUSTFMT=$(rustup which --toolchain nightly rustfmt)
  $ for f in `testrepohg files 'glob:**/*.rs'` ; do
  >   $RUSTFMT --check --edition=2018 --unstable-features --color=never $f
  > done