Conclusions of the exception discussion

[Martin Nowak]

> It's currently 'catch(auto e : E1, E2, E3)' but changing the syntax is
> trivial if everyone decides they want it.
>
We should be consistent and allow to specify a type instead of auto.
The exception types (E1, E2, E3) should expand TypeTuples similar to how  
you
declare base classes.

alias TypeTuple!(SocketTimeOut, SocketFooBar) SocketExceptions;

try
{
     bind(...);
     listen(...);
}
catch (IOException io : SocketExceptions)
{
}

As for the syntax how about '=' assigning a catched exception.
catch(IOException io = E1, E2, E3)
catch(auto io = E1, E2, E3)

The colon is used for type conversions, where left implicitly converts to  
right.
catch(E1, E2, E3 : IOException io)
catch(E1, E2, E3 : auto io)