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Anonymous sum types · Issue #294 · rust-lang/rfcs
https://github.com/rust-lang/rfcs/issues/294
直和型と合併型の混乱に始まり、終いには実質的に生存期間パラメタに関するリフレクションの発明を求めるような要望が飛び出していて、収拾が付かなくなりつつあるように見える
