rust/src/test/run-pass/shadow.rs

// -*- rust -*-
fn foo(c: [int]) {
    let a: int = 5;
    let b: [int] = ~[];


    alt none::<int> {
        some::<int>(_) { for i: int in c { log a; let a = 17; b += ~[a]; } }
      _ {}
    }
}

tag t<T> { none; some(T); }

fn main() {
    let x = 10;
    let x = x + 20;
    assert x == 30;
    foo(~[]);
}