[Issue 11178] New: Class may implement same interface multiple times with different interface pointers, breaking (a is b) semantics

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11178

           Summary: Class may implement same interface multiple times with
                    different interface pointers, breaking (a is b)
                    semantics
           Product: D
           Version: D1 & D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: default_357-line at yahoo.de


--- Comment #0 from FeepingCreature <default_357-line at yahoo.de> 2013-10-05 16:27:12 PDT ---
Consider https://gist.github.com/6847299 . The errant behavior goes away if you
remove the I2 inheritance from C2, indicating that C2 implements I2 _twice_
with different interface pointers. This leads to hilariously hard-to-find
errors, since one generally assumes that casting two objects to the same
interface makes them is-comparable if they're the same object. The second I2 in
C2 should either be made illegal or silently ignored.

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