Non-const copy constructor and implicit conversions on return value?

The error is quite clear on the list of candidates that were rejected. The problem is that implicit conversion sequences involving a user defined conversion in the C++ language are limited to a single user defined conversion.

Because you cannot do more than one implicit conversion. You would have to go A::A(A::A(int)::operator B()) to make that work, and that's way too many steps for the compiler to figure out on it's own.

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