Dave Abrahams 1a6c80a93d [stdlib] .first and .last are var:T?, not func->T ...

The global first() and last() algorithms return T?, nil when empty

All .first() and .last() methods became T? vars that are nil when the
Collection is empty

Swift SVN r20326

2014-07-22 19:30:42 +00:00

2.0 KiB

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