Assigning a mutable owned pointer to itself causes a segfault

[paigeruten]

The following program causes a segmentation fault when dereferencing x.

fn main() {
    let mut x: ~int = ~1;
    x = x;
    println("-");
    let y = *x;
    println("-");
}

My output:

jeremy@slupchik:~/tmp$ rustc -v
rustc 0.9
host: x86_64-unknown-linux-gnu
jeremy@slupchik:~/tmp$ rustc bug.rs
bug.rs:5:9: 5:10 warning: unused variable: `y`, #[warn(unused_variable)] on by default
bug.rs:5     let y = *x;
                 ^
jeremy@slupchik:~/tmp$ ./bug
-
Segmentation fault

[huonw]

Thanks for the report. I'm pretty sure this is fixed on master (I don't have access to a compiler to verify right now, so I won't close).

[sfackler]

Yep, I just verified that it runs correctly on 3eb3a02.

[alexcrichton]

Closing as a dupe of #3290, which I believe has tests already checked in.