:f = $(x)x*x

:$g(x)
	@x*x

{f(5)} = {g(5)}

{f(2)} = {g(2)}

:y = 5
:h = $(x)x*x+y

{h(3)} == 14

~ y := 7

{h(5)} == 32

:i = $y*y

{i} == 49