undefined behavior with bare fn pointer

[pfalabella]

compile with opt-level >= 2 (works fine with opt-level=0)

fn identity(a: &u32) -> &u32 { a }

fn print_foo(f: &fn(&u32) -> &u32, x: &u32) {
    println!("{}", (*f)(x));
}

fn main() {
    let x = &4;
    let f: fn(&u32) -> &u32 = identity;

    print_foo(&f, x); // prints 32597 for me
}

rustc 0.13.0-nightly (ad9e75938 2015-01-05 00:26:28 +0000)
binary: rustc
commit-hash: ad9e759382ad7daed26f86732f41f5f83cd673e2
commit-date: 2015-01-05 00:26:28 +0000
host: x86_64-unknown-linux-gnu
release: 0.13.0-nightly

[nikomatsakis]

strange. the program looks legit to me.

[pfalabella]

this works for me now, as of 44a287e

[untitaker]

This prints 4 on all opt levels for me at rustc 1.1.0-nightly (f9e53c7f2 2015-04-24) (built 2015-04-25).