ceylon/ceylon-sdk — pull request #213 by loicrouchon (2014-03-08 15:00:37+00:00)
Title: Base HashSet implementation on HashMap

Replaces `HashSet` internal implementation to use `HashMap` as storage.

This allows to factorize storage logic and fixes `HashSet` version of issue #211 (which has been fixed in #211 for `HashMap` only)