diff -r 2ba4d3b74ba8 -r 05a16c19967e mercurial/cffi/mpatch.py
--- a/mercurial/cffi/mpatch.py	Fri May 19 11:44:05 2017 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,35 +0,0 @@
-from __future__ import absolute_import
-
-import cffi
-import os
-
-ffi = cffi.FFI()
-mpatch_c = os.path.join(os.path.join(os.path.dirname(__file__), '..',
-                                     'mpatch.c'))
-ffi.set_source("_mpatch_cffi", open(mpatch_c).read(),
-               include_dirs=["mercurial"])
-ffi.cdef("""
-
-struct mpatch_frag {
-       int start, end, len;
-       const char *data;
-};
-
-struct mpatch_flist {
-       struct mpatch_frag *base, *head, *tail;
-};
-
-extern "Python" struct mpatch_flist* cffi_get_next_item(void*, ssize_t);
-
-int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist** res);
-ssize_t mpatch_calcsize(size_t len, struct mpatch_flist *l);
-void mpatch_lfree(struct mpatch_flist *a);
-static int mpatch_apply(char *buf, const char *orig, size_t len,
-                        struct mpatch_flist *l);
-struct mpatch_flist *mpatch_fold(void *bins,
-                       struct mpatch_flist* (*get_next_item)(void*, ssize_t),
-                       ssize_t start, ssize_t end);
-""")
-
-if __name__ == '__main__':
-    ffi.compile()