Can't implement the same method for multiple classes

[SSheldon]

Currently, the extern function implementing a method in the method! macro uses the first part of the selector as its name. Unfortunately, if two extern functions anywhere have the same name, rustc crashes. This is described in rust-lang/rust#16403, which was closed as a duplicate of rust-lang/rust#10883, and the discussion there seems to indicate it's an expected error and won't be fixed.

[SSheldon]

The method! macro was removed in 6605b4f. This ICE will still happen, but now that the macro isn't defining the name of the function, it's not my fault and there's nothing I can do to fix it.