1000 no segfault while importing a unified diff which start line is zero but chunk

  1001 size is non-zero

  1002 

  1003   $ hg init startlinezero

  1004   $ cd startlinezero

  1005   $ echo foo > foo

  1006   $ hg commit -Amfoo

  1007   adding foo

  1008 

  1009   $ hg import --no-commit - << EOF

  1010   > diff a/foo b/foo

  1011   > --- a/foo

  1012   > +++ b/foo

  1013   > @@ -0,1 +0,1 @@

  1014   >  foo

  1015   > EOF

  1016   applying patch from stdin

  1017 

  1018   $ cd ..

  1019