Bug 2794 – Compatibility between class and interface

Object references and those to interfaces shall be compatible. //----------------------------------------------------- interface I {} I i1 = getInstance(); I i2 = getAnotherInstance(); Object[] array; // this does not compile, but it should: bool res = (i1 == i2); array ~= i1; // instead this is atm needed: bool res = (cast(Object)i1).opEquals( cast(Object) i2 ); array ~= cast(Object)i1; //----------------------------------------------------- That implies, each interface shall have the methods from Object. Each interface shall be implicit castable to Object. For the case, an interface is derived from IUnknown the compiler can handle those interfaces special, and remove the compatibility.

I changed to D2 compiler.

*** This issue has been marked as a duplicate of issue 4088 ***