Doug Gregor 70ee642072 [Stdlib] Eliminate LazyFilterIndex. ...

Eliminate the vestigial type `LazyFilterIndex`, which was
necessary pre-Swift-3 to allow the index to move. Swift 3's indexing
model means that the movement of indices is on the collection itself,
so we no longer need `LazyFilterIndex`: instead, the `Index` type of
the lazy filtered collection is simply the `Index` type of the base
collection, which is a nice convenience: it means you can take indices
from a lazy wrapper around a given collection C and use them with the
collection C (and, with care, vice-versa) without jumping through
extra hoops.

2017-04-20 16:15:41 -07:00

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