t / chainlint / nested-subshell.teston commit help_unknown_ref(): check for refname ambiguity (2ed2e19)
   1(
   2        cd foo &&
   3        (
   4                echo a &&
   5                echo b
   6        ) >file &&
   7
   8        cd foo &&
   9        (
  10# LINT: nested multi-line subshell not presently checked for missing "&&"
  11                echo a
  12                echo b
  13        ) >file
  14)