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PERLANCAR / File-Patch-Undoable-0.06 / t / data / file.c.patch 
*** file.old	2012-09-07 12:58:02.000000000 +0700
--- file.new	2012-09-07 12:58:39.000000000 +0700
***************
*** 1,6 ****
  line 1
- line 2
  line 3
! line 4
! line 5
  line 6
--- 1,8 ----
  line 1
  line 3
! 
!   line 4 - modified
!   modified line 5
  line 6
+ line 7
+ line 8