E2559 Can't initialize rvalue reference of type '%s' with lvalue of type '%s' (C++)

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This error message occurs when attempting to bind an lvalue to an rvalue reference. When converting to an rvalue reference type, the source must not be an lvalue (such as a named variable) or an rvalue reference to a function type.

Example: 

    A&  a_ref3 = A();  // Error!
    A&& a_ref4 = A();  // Ok
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