D-Programming-Language/dmd — pull request #571 by 9rnsr (2011-12-19 12:04:32+00:00)
Title: Issue 6939 & 6940 & 7136 - Fix type combination

Issue 6939 - wrong type qualifier combination
Issue 6940 - immutable(int*)*/immutable(int)** and int** do not combine
Issue 7136 - alias this lookup should run before merging modifiers of both sides.