David Rönnqvist b5d47fc37b [stdlib] Add unit tests for the two reduce variants ...

This checks:
 - The examples from the documentation of `reduce(_:_:)` and `reduce(into:_:)`.
 - Different levels of inference in the closure arguments being passed.
 - That the value passed as the `initialResult` remains unmodified.

2017-07-16 17:08:15 +02:00

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