1 Set up

     2 

     3   $ hg init repo

     4   $ cd repo

     5 

     6 Try to import an empty patch

     7 

     8   $ hg import --no-commit - <<EOF

     9   > EOF

    10   applying patch from stdin

    11   abort: stdin: no diffs found

    12   [255]

    13 

    14 A dirstate backup is left behind

    15 

    16   $ ls .hg/dirstate* | sort

    17   .hg/dirstate

    18   .hg/dirstate.backup.import.* (glob)

    19