AddressSet.unify: fix reduction bug #2502
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If AddressSet.unify is ever passed a Seq with a duplicated AddressSet, it will incorrectly widen that AddressSet. This can happen even if you called .distinct before calling AddressSet.unify, because unification can merge two AddressSets into a new AddressSet which collides with a pre-existing overlap/duplicate.
aswaterman
approved these changes
Jun 5, 2020
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If AddressSet.unify is ever passed a Seq with a duplicated AddressSet, it
will incorrectly widen that AddressSet. This can happen even if you called
.distinct before calling AddressSet.unify, because unification can merge two
AddressSets into a new AddressSet which collides with a pre-existing
overlap/duplicate.
Type of change: bug report
Impact: no functional change
Development Phase: implementation
Release Notes
Fixed a very bad bug introduced in 63becef on May 11.