tests/test-gendoc-sv.t

revset: add test for resolution of infix/suffix ambiguity of x^:y

This is the test for 805651777188, and I'm going to fix the failure of
'x^A' where 'revsetalias.A=:y'.

#require docutils gettext

  $ $TESTDIR/check-gendoc sv
  checking for parse errors