enum equality no longer works

[jesse99]

With master pulled on Sep 22, 2012 it fails with failed to find an implementation of trait @core::cmp::Eq for MyEnum.

(I know that this is a known issue, but it's good to formally track it, especially if it isn't fixed for 0.4).

[jesse99]

Not sure what the best work around is. Enums are often complicated enough that hand-writing an equality function is a pita. I've been using fmt!("%?", my_enum) in unit tests which more or less works. But that is now broken for recursive enums, see #3556.

[pcwalton]

We will need the deriving feature to be added for this to work. For enums with no payloads (self as uint) == (other as uint) works fine. But for others it's a nuisance.

[kud1ing]

Can this be closed?

[thestinger]

Closing since #[deriving_eq] exists now.