Segmentation fault on safe test panic

[wthrowe]

This is as minimal an example as I've been able to reduce this to so far:

fn f(_: Vec<u32>, _: &Vec<u32>) {
    panic!();
}

fn identity(r: &Vec<u32>) -> &Vec<u32> { r }

#[test]
fn t() {
    f(vec![0], identity(&Vec::new()));
}

$ rustc --version
rustc 1.0.0 (built 2015-05-22)
$ rustc --test foo.rs
$ ./foo 

running 1 test
Segmentation fault
$ 

[sfackler]

Looks like heap corruption. Valgrind output and backtrace: https://gist.github.com/sfackler/4ecc56dc1324ae07a2ce

Nominating.

[alexcrichton]

Confirmed dupe of #25089 (fixed by #26062)