I think the change in 1.6 to array-map! to check for no source args is
too strict, it rejects one source arg, eg.

	(array-map! #(1 2) noop #(3 4))
	=>
	<unnamed port>:1:7: In procedure array-map! in expression (array-map! #(1 2) noop ...):
	<unnamed port>:1:7: At least one source array is required.
	ABORT: (misc-error)

I'm thinking of

        * ramap.c (scm_array_map_x): Correction to sources list check, only
        need at least one source, not two.  And use SCM_WRONG_NUM_ARGS() for
        the error.

Likewise in the head (which hasn't had this check at all yet).