[phobos] Exception chaining

[Andrei Alexandrescu]

On 1/11/11 4:03 PM, Jonathan M Davis wrote:
> On Tuesday, January 11, 2011 15:50:52 Andrei Alexandrescu wrote:
>> I don't think that's helpful. It complicates the flow a lot because now
>> understanding how the program acts depends not on the types anymore, but
>> on what happens dynamically. Makes it more difficult, not easier, to
>> write robust code.
>>
>> If I throw a FileException, I must catch a FileException with
>> catch(FileException) regardless of what collateral exceptions have
>> happened.
>
> I agree as long as it's other Exceptions that have been thrown. But Errors?
> Aren't they typically supposed to kill your program?
>
> - Jonathan M Davis

I agree that non-Exception Throwables are an out-of-band method of 
communication that deserves special attention.

Don, would it be difficult to make a non-Exception Throwable thrown 
during unwinding essentially come to the top of the foodchain and save 
everything in its tail?


Andrei