scalaz/scalaz — pull request #492 by xuwei-k (2013-08-27 09:20:06+00:00)
Title: fix EphemeralStream#unzip type constraint

because type inference fail unless explicit

```
tests/src/test/scala/scalaz/EphemeralStreamTest.scala:33: Cannot prove that (Int, Int) =:= (X, Y).
[error] val (firsts, seconds) = xs.unzip
[error] ^
[error] one error found
```