tests/test-module-imports.t

import-checker: backout 40f79b9a2cc8 (issue4129)

This patch backs out 40f79b9a2cc8, which caused test-module-imports.t to
be skipped when the test was run using virtualenv.  Since the test now
passes when using virtualenv, the skip is no longer necessary.

This code uses the ast module, which was new in 2.6, so we'll skip
this test on anything earlier.
  $ python -c 'import sys ; assert sys.version_info >= (2, 6)' || exit 80

  $ import_checker="$TESTDIR"/../contrib/import-checker.py
Run the doctests from the import checker, and make sure
it's working correctly.
  $ TERM=dumb
  $ export TERM
  $ python -m doctest $import_checker

  $ cd "$TESTDIR"/..
  $ if hg identify -q > /dev/null 2>&1; then :
  > else
  >     echo "skipped: not a Mercurial working dir" >&2
  >     exit 80
  > fi

There are a handful of cases here that require renaming a module so it
doesn't overlap with a stdlib module name. There are also some cycles
here that we should still endeavor to fix, and some cycles will be
hidden by deduplication algorithm in the cycle detector, so fixing
these may expose other cycles.

  $ hg locate 'mercurial/**.py' | xargs python "$import_checker"
  mercurial/dispatch.py mixed stdlib and relative imports:
     commands, error, extensions, fancyopts, hg, hook, util
  mercurial/fileset.py mixed stdlib and relative imports:
     error, merge, parser, util
  mercurial/revset.py mixed stdlib and relative imports:
     discovery, error, hbisect, parser, phases, util
  mercurial/templater.py mixed stdlib and relative imports:
     config, error, parser, templatefilters, util
  mercurial/ui.py mixed stdlib and relative imports:
     config, error, formatter, scmutil, util
  Import cycle: mercurial.cmdutil -> mercurial.subrepo -> mercurial.cmdutil
  Import cycle: mercurial.repoview -> mercurial.revset -> mercurial.repoview
  Import cycle: mercurial.fileset -> mercurial.merge -> mercurial.subrepo -> mercurial.match -> mercurial.fileset
  Import cycle: mercurial.filemerge -> mercurial.match -> mercurial.fileset -> mercurial.merge -> mercurial.filemerge