scala/scala — pull request #4 by szeiger (2011-12-01 14:03:23+00:00)
Title: Improved BitSet implementations

- Mutable and immutable BitSets now extend SortedSet, using a fixed
Ordering.Int and an efficient bit mask based rangeImpl()
- fromArray methods in both implementations are deprecated in favor of
new fromBitMask and fromBitMaskNoCopy methods
- New toBitMask method for converting bit sets back to Array[Long] bit
masks
- immutable.BitSet uses a more efficient Builder, based on
mutable.BitSet (closes SI-4647)
- Delete scala.tools.nsc.util.BitSet (not used anywhere)

Review by @odersky