Resolve should make sure variables aren't used before they're declared

[pcwalton]

Typestate usually errors out when this happens, but the message is confusing. This should be picked up in resolve.

[graydon]

Disagree. Typestate is the right place to do this, and closures make it unclear anyways. If the error message is bad, that's a different bug.

[pcwalton]

I'm not sure how closures make this unclear.

I guess the issue is that variable declarations in Rust hoist just like JavaScript. Is this intended behavior?

[eholk]

As a C/C++ programmer, it's really weird to me that stuff like this is legal:

fn main() {
    x = 4;
    log_err x;
    auto x;
}

[marijnh]

Fixed by e33af7e