[phobos] Printing exceptions

[Sean Kelly]

The display when an exception escapes main() will include the stack trace no matter what.  I'm mostly wondering what toString is intended for with exceptions.
On Apr 7, 2010, at 9:37 AM, David Simcha wrote:

> IMHO the reasonable default if a program crashes due to a completely unexpected exception is for the stack trace to be printed.  Therefore, yes, toString should add the stack trace.
> 
> On Wed, Apr 7, 2010 at 12:36 PM, Sean Kelly <sean at invisibleduck.org> wrote:
> Related question: should toString add the stack trace or not?
> 
> On Apr 7, 2010, at 8:39 AM, Andrei Alexandrescu wrote:
> 
> > At what point do you need to print exceptions in runtime? Is that if an exception leaves main()?
> >
> > Andrei
> >
> > On 04/07/2010 10:29 AM, Sean Kelly wrote:
> >> The runtime can do one of two things: print exceptions according to a standard format and inject the msg field in the proper place or it can call toString.  Which should be done?  I prefer the former because it makes for a standard presentation and doesn't risk allocating memory needlessly, but I can see how people might do fancy stuff in toString that they expect to be used instead.  This came up because I'm adding a default stack trace handler, and the current behavior prints the stack trace twice, so something needs to change.
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