lvalue-xvalue-prvalue
• iM: has identity and cannot be moved from
• im: has identity and can be moved from (e.g. the result of casting an lvalue to a rvalue reference)
• Im: does not have identity and can be moved from
• iM: has identity and cannot be moved from
• im: has identity and can be moved from (e.g. the result of casting an lvalue to a rvalue reference)
• Im: does not have identity and can be moved from
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