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Aaron Turon e91d810b9b Libs: Unify concat and concat_vec
We've long had traits `StrVector` and `VectorVector` providing
`concat`/`connect` and `concat_vec`/`connect_vec` respectively. The
reason for the distinction is that coherence rules did not used to be
robust enough to allow impls on e.g. `Vec<String>` versus `Vec<&[T]>`.

This commit consolidates the traits into a single `SliceConcatExt` trait
provided by `slice` and the preldue (where it replaces `StrVector`,
which is removed.)

[breaking-change]
2014-12-30 12:02:22 -08:00
..
2014-12-21 23:31:42 -08:00
2014-12-30 12:02:22 -08:00
2014-12-30 12:02:22 -08:00