unique pointers + macros → rust: task failed at 'assertion failed: !bcx.ccx().maps.moves_map.contains(&arg_expr.id)'

[jld]

Minimized test case:

macro_rules! thing {
    ($e:expr) => { thing!($e, $e) };
    ($e0:expr, $e1:expr) => {{
        let e = $e0;
        assert!(e == $e1);
    }}
}

pub fn main() {
    thing!(~17);
}

Note that substituting thing!(~17, ~17) works, and similarly for let e = $e0; let ee = $e1; assert!(e == ee). Gist of the ::rt::backtrace: https://gist.github.com/jld/5435823

[metajack]

This still happens. Nominating production ready.

[graydon]

accepted for production-ready milestone

[sanxiyn]

No more ICE. Probably fixed by #9088.

[alexcrichton]

Closing as fixed by #9088 (which has many tests already checked in)