[Issue 3543] : ? operator can't find common type for classes/interfaces

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3543



--- Comment #8 from Walter Bright <bugzilla at digitalmars.com> 2011-04-06 10:51:03 PDT ---
(In reply to comment #7)
> Interface hierarchies for a single-rooted DAG. In the DAG there are one or more
> common ancestors for any pair of nodes. The most specific one (farthest from
> the root) must be chosen. If there are two or more at the same depth that's an
> ambiguity error.

Interface hierarchies are not necessarily single rooted. They are multiply
inherited.

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