math = pyimport "math"

_: Float = math.prod [1.1, 2.1]
print! math.prod ["a", "b"] # ERR
_: Nat = math.prod [1, 2, 3]
_: Str = math.prod [1, 2, 3] # ERR

eq x, y = x == y
print! eq 1, 1
print! eq 1, "a" # ERR