Zig: Proposal: Make unary minus for unsigned types a compile error

[Snektron]

fn negate(x: u32) u32 {
    return -x;
}

This is currently safety-checked undefined behaviour, however, this misstake can already be catched
at compile time.

[Snektron]

Another option is to make -unsigned return a signed type of higher bitness, so

fn negate(x: u32) i33 {
  return -x;
}

would be valid.

[pixelherodev]

Compiler error makes more sense IMO. If you want to change signed <-> unsigned, you should have to use an explicit cast.

[andrewrk]

Related: #1770

[Snektron]

Closed by #5654