Made Stream.collect collect instead of filter.

Glad to see there was a test case; but we have to push harder when
writing tests to include the key characteristics of the function being
tested. No review.

2 files changed, 3 insertions, 5 deletions

diff --git a/src/library/scala/collection/immutable/Stream.scala b/src/library/scala/collection/immutable/Stream.scala
index 771b945dec..50b086a881 100644
--- a/src/library/scala/collection/immutable/Stream.scala
+++ b/src/library/scala/collection/immutable/Stream.scala
@@ -690,7 +690,7 @@ object Stream extends SeqFactory[Stream] {
   }
 
   private[immutable] def collectedTail[A, B, That](stream: Stream[A], pf: PartialFunction[A, B], bf: CanBuildFrom[Stream[A], B, That]) = {
-    new Stream.Cons(stream.head, stream.tail.collect(pf)(bf).asInstanceOf[Stream[B]])
+    new Stream.Cons(pf(stream.head), stream.tail.collect(pf)(bf).asInstanceOf[Stream[B]])
   }
 
   /** A stream containing all elements of a given iterator, in the order they are produced.
diff --git a/test/files/run/t4294.scala b/test/files/run/t4294.scala
index 588fa90f76..50c83ac819 100644
--- a/test/files/run/t4294.scala
+++ b/test/files/run/t4294.scala
@@ -1,9 +1,7 @@
-
-
-
-
 object Test {
   def main(args: Array[String]) {
     (Stream.from(1).collect{case x if x > 5000000 => x}: Stream[Int])
+
+    assert((Stream from 1 take 10 collect { case x if x <= 3 => x*x }).sum == 14)
   }
 }