Using the included file:

emacs -Q foo.c
C-x h
C-M-\

Please note that after (and before) this the define
_connector_write_block_next_rec is indented at level 8 instead of 4
unlike all the other defines.  Removing and/or shortening the previous
defines in many cases seems to remove this strangeness, so it's likely
that there's a corner case involving a limit.