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* SI-7590 TreeSet should fail fast if Ordering is nullSimon Ochsenreither2013-06-251-1/+4
| | | | | | | | | | While migrating scala.tools.nsc.util.TreeSet to scala.collection.mutable.TreeSet, I messed up initialization order and realized that TreeSet accepts null as an Ordering and only fails much later. This change makes mutable.TreeSet and immutable.TreeSet fail immediately.
* Add mutable tree sets to the standard library.aleksandar2012-01-121-0/+67
This implementation is based on AVL trees. The current implementation is contributed by Lucien Pereira. Fixes #4147.