Bug 15670 – std.variant.Variant does not allow classes derived from templated classes

The following code does not compile: void main() { import std.variant; class BaseTemplate(T) { this() {} } class Concrete : BaseTemplate!int { this() {} } Algebraic!(Concrete) holder; Concrete a = new Concrete(); holder = Algebraic!Concrete(a); } Error: static assert "Cannot store a Concrete in a VariantN!(8LU, Concrete)" test.d(10): instantiated from here: __ctor!(Concrete)