[swift-evolution] Equatability for enums with associated values

[Anton Zhilin]

That seems pretty close to Rust’s derive. Why not invent a similar syntax
in Swift? Otherwise it will make us look through all the sources to make
sure deriving is used.

enum Option: @derive Equatable {
    ...
}

Also, we can get better looking compilation errors, like:

ERROR at line 1, col 14: could not derive Equatable for Option
enum Option: @derive Equatable {
             ^~~~~~~~~~~~~~~~~

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