'+' (read+write) asm outputs not supported

[kmcallister]

#[feature(asm)];

fn main() {
    unsafe {
        let x: uint = 0;
        asm!("" : "+r"(x));
    }
}

$ rustc -v
rustc 0.10-pre (68a4f7d 2014-02-24 12:42:02 -0800)
host: x86_64-unknown-linux-gnu

$ rustc foo.rs
foo.rs:6:19: 6:23 error: internal compiler error: unimplemented '+' (read+write) output operand constraint modifier
This message reflects a bug in the Rust compiler. 
We would appreciate a bug report: http://static.rust-lang.org/doc/master/complement-bugreport.html
foo.rs:6         asm!("" : "+r"(x));

[alexcrichton]

Closed by #12798 (just an out of date rustc)