Expected loop bounds to be constant

[dark64]

Description

Loop bounds are not propagated correctly

Environment

• Compiler version: 0.8.7
• Operating system: Ubuntu

Steps to Reproduce

import "utils/casts/field_to_u32";

def main() {
    u32 bound = field_to_u32(2);
    for u32 i in 0..bound {
        log("{}", i);
    }
}

Error: Expected loop bounds to be constant, found 0..bound˙