nested `for` loops in global scope can't share a control variable

[egranata]

This test program fails:

import aria.range.int_extension;

val inner = 0;
val outer = 0;
for i in 0.to(12) {
    for i in 0.to(500) {
        inner += 1;
    }
    outer += 1;
}

assert inner == 6000;
assert outer == 12;

because it only goes through the outer loop once, it sees i == 500 at the end of the first iteration and gets out

The program behaves correctly if embedded in a func main()

[egranata]

Yeah - I have discovered this bug before: #121

I would say out of scope for Aria 1.0, although maybe it warrants being documented