Section 15.3 paragraph 3 of the Standard lists the rules for
type-matching of thrown exception objects against catch clauses. A
straightforward reading appears to exclude the possibility of thrown
pointer-to-derived being caught by reference-to-pointer-to-base.
However, Defect Report 388 has been filed against this issue
(http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#388) based
on the observation that many compilers have a different behaviour. The
defect has open status. Does anyone here have a view on what the
intended behaviour is in this case, or why the defect remains open?

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