[swift-evolution] [Pitch] Remove destructive consumption from Sequence

Anton Zhilin antonyzhilin at gmail.com
Thu Jun 23 16:04:44 CDT 2016

One practical implication of treating Sequence as infinite is in lazy 
filter. If you pass Sequence, but not Collection, to lazy filter, it will 
guarantee to iterate it only once. If it's a collection, it will feel free 
to iterate it twice.

So one benefit of single-pass sequences is assumptions about behaviour of 
an API: if it can work with sequences, then it will only iterate them 

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