On Tuesday, 5 September 2017 at 21:44:07 UTC, jmh530 wrote:

This is related to Issue 2538:
https://issues.dlang.org/show_bug.cgi?id=2538

The spec has more information on interfaces here
https://dlang.org/spec/interface.html

And here is a simpler example:

interface I1
{
    void A();
}

interface I2: I1
{
    final void A() { }
}

class B: I2
{
//It is an error to declare this class either with A or without it
}

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