rust-lang/rust — pull request #19827 by japaric (2014-12-14 03:58:26+00:00)
Title: libcore: make iterator adaptors `Clone`/`Copy`able

closes #12677 (cc @Valloric)
cc #15294

r? @aturon / @alexcrichton

(Because of #19358 I had to move the struct bounds from the `where` clause into the parameter list)