[e-lang] scoping rules of when-catch

[Marc Stiegler]

Deprecate it.

--marcs

Mark Miller wrote:

> I just talked to MarcS and clarified that his concern was to ensure
> that the <catchClause> would still be allowed, as indeed it can.
> However, I am thinking about deprecating and eventually removing the
> <funcHeader>. It no longer seems to me that it provides enough value
> to justify its weight. Does anyone see any compelling reason to
> continue to allow the <funcHeader>?
>