Bug 19130 – Disabling opAssign in aliasing struct hides all opAssigns in subtyped alias

struct A { void opAssign(int) {} } struct B { A a; alias a this; @disable void opAssign(string) {}; } void main() { B b; b = 3; } Produces Error: function `onlineapp.B.opAssign` is not callable because it is annotated with @disable This kind of functionality is very useful for proxy types that have an alias T this, but want to disable copying (i.e this(this) and copy opAssign)

Works as designed. As I mentioned in the forum thread, when you override one overload of a base function, you override them all. With classes, you can alias in the base class definitions of the function, but with alias this, that is not an option (there will be a `this` type mismatch). The workaround is to forward the other overloads back to the base. e.g.: auto opAssign(int x) { return a.opAssign(x); }