[stdlib] Adopt conditional conformance for Indices, Slice, ReversedCollection (#12913)

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* Refactor Indices and Slice to use conditional conformance

* Replace ReversedRandomAccessCollection with a conditional extension

* Refactor some types into struct+extensions

* Revise Slice documentation

* Fix test cases for adoption of conditional conformances.

* [RangeReplaceableCollection] Eliminate unnecessary slicing subscript operator.

* Add -enable-experimental-conditional-conformances to test.

* Gruesome workaround for crasher in MutableSlice tests

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This commit is contained in:

Ben Cohen

2017-11-30 09:10:22 -08:00

committed by GitHub

parent eea5e5db47

commit c4f0b5fe94

25 changed files with 347 additions and 680 deletions

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