Incorrect 'cannot bind by-move with sub-bindings` error

[brson]

                while self.from_content.peek() {                                                                   
                    match self.from_content.recv() {                                                               
                        move msg @ BuildMsg(*) => {                                                                
                            last_build_msg = Some(move msg);                                                       
                        }                                                                                          
                        move msg => {                                                                              
                            enqueue_last_build_msg();                                                              
                            // Other messages need responses                                                       
                            request_queue_chan.send(msg);                                                          
                        }                                                                                          
                    }                                                                                              
                } 

/home/brian/dev/servo/src/servo/layout/layout_task.rs:241:24: 241:49 error: cannot bind by-move with sub-bindings
/home/brian/dev/servo/src/servo/layout/layout_task.rs:241                         move msg @ BuildMsg(*) => {
                                                                                  ^~~~~~~~~~~~~~~~~~~~~~~~~

There aren't any sub-bindings there.

[pcwalton]

Still a problem, but I don't think this is a backwards compatibility issue.

[pcwalton]

Minimal test case:

struct Foo(~str);

fn main() {
    match Foo(~"hi") {
        msg @ Foo(_) => {}
    }
}

[pnkfelix]

accepted for feature complete milestone

[huonw]

Triage visit; will be fixed when #8508 lands.