StackOverFlowError When Applying Filter to a Stream

Hello,


Please can some one explain why the following code blows the stack:


val fibs: Stream[BigInt] = BigInt(0) #:: BigInt(1) #:: fibs.zip(fibs.tail).map { n => n._1 + n._2 }.takeWhile(x => x < 4000000).filter(x => x % 2 == 0)

scala> fibs foreach println01
java.lang.StackOverflowError

If I take out the filter and apply it to the stream in another expression 
as follows, it is fine:

scala> val fibs: Stream[BigInt] = BigInt(0) #:: BigInt(1) #:: fibs.zip(fibs.tail).map { n => n._1 + n._2 }.takeWhile(x => x < 4000000)
fibs: Stream[scala.math.BigInt] = Stream(0, ?)

scala> fibs filter ( x => x % 2 == 0)
res8: scala.collection.immutable.Stream[scala.math.BigInt] = Stream(0, ?)

scala> fibs filter ( x => x % 2 == 0) foreach println02834144610258410946463681964188320403524578

Why does it blow the stack with the first approach but not the second?


Thanks

Iftikhar

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