Missing boolean NOT operator

[cardillan]

Currently, there isn't a boolean negation operator. Both negation operators that are currently defined (! and not) compile to an op flip/not instruction (the operator is called "flip" in GUI and "not" in Mindustry "assembly" language), which produces bitwise negation. This means that the following code

while not switch1.enabled
    print("Press the button to start...")
    printflush(message1)
end

won't work (switch1.enabled produces 1 when the button is pressed, and bitwise negation makes it into -2).

I propose creating a new unary operator ~ for bitwise negation, and repurposing both ! and not for boolean negation. However, this change could break existing code. @francois, shall I do this?

[francois]

Yes, you can go ahead.