bors 5a83fa271d Auto merge of #25120 - bluss:sliceconcatext, r=alexcrichton
collections: Convert SliceConcatExt to use associated types

Coherence now allows this, we have `SliceConcatExt<T> for [V] where T: Sized + Clone` and` SliceConcatExt<str> for [S]`, these don't conflict because
str is never Sized.
2015-05-06 11:56:15 +00:00
..
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