[Issue 20756] ImplicitConversionTargets ignores interface inheritance

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20756

--- Comment #6 from FeepingCreature <default_357-line at yahoo.de> ---
ImplicitConversionTargets has been deprecated. AllImplicitConversionTargets
supports interface inheritance.

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