rust/src/test/compile-fail/liveness-dead.rs

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fn f1(x: &mut int) {
*x = 1; // no error
}
fn f2() {
let mut x = 3; //~ WARNING value assigned to `x` is never read
x = 4;
copy x;
}
fn f3() {
let mut x = 3;
copy x;
x = 4; //~ WARNING value assigned to `x` is never read
}
fn main() { // leave this in here just to trigger compile-fail:
let x: int;
copy x; //~ ERROR use of possibly uninitialized variable: `x`
}