Satisfying interface requirements

[Jason House]

Attached is a simple example that demonstrates my problem (with dmd 1.018).  It seems like inheriting from a class that contains functions that would satisfy an interface does not work.  Usually, I work around this by just adding a manual call to super's copy.  Unfortunately, this only works if super's member function is not final.  Any tips on how to work around this?

If line 7 is commented out:
test.d(6): class test.foo interface function bar.start is not implemented

If line 7 is present:
test.d(7): function test.foo.start cannot override final function tango.core.Thread.Thread.start
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