[SR-361] Implement SE-0008: Add a Lazy flatMap for Sequences of Optionals

[DougGregor]

Previous ID	SR-361
Radar	None
Original Reporter	@DougGregor
Type	New Feature
Status	Resolved
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s	Standard Library
Labels	New Feature
Assignee	russ (JIRA)
Priority	Medium

md5: 7b93a665c171cf85a8676fbf35cb55ab

Issue Description:

Implement SE-0008

https://github.com/apple/swift-evolution/blob/master/proposals/0008-lazy-flatmap-for-optionals.md

[lattner]

this got implemented in Swift 2.2

[natecook1000]

@lattner I haven't seen an implementation of this in either 2.2 or 3.0.

[lattner]

Ah, you're right!

[swift-ci]

Comment by Russ Bishop (JIRA)

I'm halfway through the implementation of this unless someone has objections.

[lattner]

Great!

[swift-ci]

Comment by Russ Bishop (JIRA)

PR #2461

[swift-ci]

Comment by Russ Bishop (JIRA)

Merged in #2461