29 % hg parents -r 2 ../a

    30 abort: ../a not under root

    31 % cd dir; hg parents -r 2 ../a

    32 changeset:   0:b6a1406d8886

    33 user:        test

    34 date:        Thu Jan 01 00:00:00 1970 +0000

    35 summary:     ab

    36 

    37 % hg parents -r 2 path:a

    38 changeset:   0:b6a1406d8886

    39 user:        test

    40 date:        Thu Jan 01 00:00:00 1970 +0000

    41 summary:     ab

    42 

    43 % hg parents -r 2 glob:a

    44 abort: can only specify an explicit file name