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* James Rhodes:

> However, I want to modify the try-catch so that it can be of the form:
> try
>   -- attempt code
> catch (Engine.DivideByZeroException e) do
>   -- catch Engine.DivideByZeroException
> catch (Engine.Exception e) do
>   -- catch Engine.Exception
> end

What about using guards?

    -- attempt code
  catch e if is(e, Engine.DivideByZeroException) then
    -- catch Engine.DivideByZeroException
  catch e if is(e, Engine.Exception) then
    -- catch Engine.Exception

I think the syntax is still sufficienty concise.

If you follow this path, you don't have to force a particular object
system on users.