[Issue 2511] Covariant return type doesn't work with circular import

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=2511



--- Comment #4 from Rainer Schuetze <r.sagitario at gmx.de> 2009-09-18 01:07:31 PDT ---
Created an attachment (id=456)
better detection if a base class is forward referenced

The current implementation (as of DMD 2.032) defers covariance analysis only if
the base class is not yet semantically analysed and it is not an interface. The
patch refines this condition by testing whether the class has any forward
referenced base classes or interfaces.

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