Ben Cohen 4ddac3fbbd [stdlib] Eradicate IndexDistance associated type (#12641) ...

* Eradicate IndexDistance associated type, replacing with Int everywhere

* Consistently use Int for ExistentialCollection’s IndexDistance type.

* Fix test for IndexDistance removal

* Remove a handful of no-longer-needed explicit types

* Add compatibility shims for non-Int index distances

* Test compatibility shim

* Move IndexDistance typealias into the Collection protocol

2017-12-08 12:00:23 -08:00

785 B

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