Nested function calls

Have you ever asked yourself what the following snippet will produce?

function my(num)
    assign num plus 1 to num
    return num
end

print(my(my(0)))

You are right! The output will be

jask ~> 2.0

The interpreter first executes my(0). Because a value was pushed and not a variable, a new variable is locally created on the function heap. The heap will be transfered to the second my() call and furthermore to the print call where it is destroyed.