scala Stream::filterNot not lazy -


a simple example following:

val set = set(0, 1, 2) stream.from(0).filternot(set).head

it seems loop forever; following code works:

stream.from(0).filter(!set(_)).head

i using 

scala code runner version 2.11.4 -- copyright 2002-2013, lamp/epfl

is bug? or reason this?

according ticket: https://issues.scala-lang.org/browse/si-8627 implementation of filternot applies streams not lazy, manifest in seeing.

so, appears bug , according ticket, no way has been found fix without either significant performance penalties other collections or else breaking binary compatibility, hence seems targeted @ major release (2.12)


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