Note that, in a try/catch/finally construct, you can already omit the catch
clause if there is a finally clause. The effect, of course, is not to swallow
the exception, but, on the contrary, to propagate it as if there was `catch (e)
{ throw e }`. (The useful part of such a construct is the finally clause.)
Also, in languages and dialects supporting conditional catch clauses, if the
thrown exception does not match the condition of any catch clause, it is
propagated.
So, the rule is: If there a matching catch clause, the exception is handled by
it; otherwise, it is propagated. Reversing that rule (“propagated” → “not
propagated”) is very dubious, to start (regardless of any other consideration).
—Claude
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