Ppxlib_print_diff (ppxlib.Ppxlib_print

val print : 
  ?diff_command:string ->
  ?extra_patdiff_args:string list ->
  ?use_color:bool ->
  file1:string ->
  file2:string ->
  unit ->
  unit

Diff two files. Use diff_command to specify what command to use. If not specified patdiff is used, with a fallback to diff -u if patdiff produces no differences.