[swift-evolution] Proposal: Add SequenceType.first

[Brent Royal-Gordon]

> If I don’t sound sympathetic, it’s because nobody has shown a use-case for this functionality, and until I see one I am going to have a hard time believing there’s a problem worth solving.  If you want to make the case that we need something like this, please show me why. 

Didn't this thread start off with a use case?

	seq.lazy.filter(predicate).first		// is not actually lazy, and Swift provides no good way to do this

One way to fix this is to add `first` to `SequenceType`, but it feels strange for a property to potentially consume part of the sequence. `buffered` ultimately has the same problem. By representing this as a function, it at least looks like something that might have side effects.

-- 
Brent Royal-Gordon
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