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* Fixed an issue with ListSet getting confused ab...Paul Phillips2010-09-181-0/+6
| | | | | | Fixed an issue with ListSet getting confused about what goes forward and what goes backward. No review.
* Some tweaks to ListSet to make it less patholog...Paul Phillips2010-09-171-0/+13
Some tweaks to ListSet to make it less pathological in its outlook. We can see some modest improvements in run time and answer quality via the enclosed test case: // with this patch: 2.250s elapsed, assertions pass. // without this patch: 51.441s elapsed, and it's a mercy killing: java.lang.StackOverflowError at scala.collection.immutable.ListSet$Node.contains(ListSet.scala:117) at scala.collection.immutable.ListSet$Node.contains(ListSet.scala:117) Closes #3822, review by community.