Compilation failure with @disable

[rcorre]

Given

struct S {
    mixin Witchcraft;
    @disable bool opEquals;
}

I see

|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/methods.d-mixin-168(168,58): Error: function app.S.opEquals is not callable because it is annotated with @disable
|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/structs.d(29,51): Error: template instance app.S.Witchcraft!().metaof.WitchcraftMethod!().MethodMixin!(S, "opEquals", 0LU) error instantiating
|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/base.d(43,37):        instantiated from here: StructMixin!(S)
|| dmd failed with exit code 1.

[rcorre]

For a more common example of disabling the default constructor:

struct S {
    mixin Witchcraft;
    @disable this();
    this(int i) { }
}

The error is a little different:

|| /usr/include/dlang/dmd/std/variant.d(755,22): Error: variable std.variant.VariantN!32LU.VariantN.get!(S).get.result default construction is disabled for type S
|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/methods.d(159,40): Error: template instance std.variant.VariantN!32LU.VariantN.get!(S) error instantiating
|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/structs.d(29,51):        instantiated from here: MethodMixin!(S, "getMetaType", 0LU)
|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/base.d(43,37):        instantiated from here: StructMixin!(S)
|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/constructors.d(144,37): Error: constructor app.S.this is not callable because it is annotated with @disable
|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/structs.d(58,41): Error: template instance app.S.Witchcraft!().metaof.WitchcraftConstructor!().ConstructorMixin!(S, 0LU) error instantiating
|| ../.dub/packages/witchcraft-0.1.9/witchcraft/source/witchcraft/mixins/base.d(43,37):        instantiated from here: StructMixin!(S)