Documentation / technical / api-xdiff-interface.txton commit set_try_to_free_routine(NULL) means "do nothing special" (00b0d7f)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)