White/BlackHole does not generate correct function signatures for functions annotated with return/scope:

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import std.typecons;

interface I
{
    I foo() return scope;
}

void main()
{
    scope i = new BlackHole!I();
    i.foo();
}

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/dlang/dmd/linux/bin64/../../src/phobos/std/typecons.d-mixin-4543(4544): Error: function I std.typecons.AutoImplement!(I, generateEmptyFunction, isAbstractFunction).AutoImplement.foo() does not override any function, did you mean to override scope I onlineapp.I.foo() return?
/dlang/dmd/linux/bin64/../../src/phobos/std/typecons.d(4315): Error: template instance std.typecons.AutoImplement!(I, generateEmptyFunction, isAbstractFunction) error instantiating
onlineapp.d(10):        instantiated from here: BlackHole!(I)