preparation for calling golang func foo for (foo x y z) etc.
	modified:   broom/builtin.go
	modified:   broom/core.brm
	modified:   broom/ea.go
	modified:   broom/pair.go
	modified:   broom/repl.go
	modified:   broom/srfi-1.brm
	modified:   tests/srfi-1.brm