[ Bellevue: ]

How could this be implemented in a way that the dynamic type is cloned?

The feature is designed to create an exception_ptr from an object whose static type is identical to the dynamic type and thus there is no slicing involved.

It could be I did not understand the design rationale, but I thought copy_exception would produce an exception_ptr to the most-derived (dynamic) type of the passed exception. Instead it slices, which appears to be less useful, and a likely source of FAQ questions in the future.

(Peter Dimov suggests NAD)