:a = 5

:$ f(p)
	@a

:$ f(p) = v
	|v={v}
	a = v

:$ f(p) = v::string
	|v2={v}
	a = p

|{f(a)}

f(3) = 50

|{f(a)}

f(3) = "ok"

|{f(a)}