t / chainlint / nested-subshell.expecton commit help_unknown_ref(): check for refname ambiguity (2ed2e19)
   1(
   2        cd foo &&
   3        (
   4                echo a &&
   5                echo b
   6>>      ) >file &&
   7        cd foo &&
   8        (
   9                echo a
  10                echo b
  11>>      ) >file
  12>)