Re: [Scheme-reports] Exception handling

[Vincent Manis <vmanis@x>]

On 2011-05-02, at 07:18, Aaron W. Hsu wrote:
> On Mon, 02 May 2011 06:35:59 -0400, Alaric Snell-Pym  
> <alaric@x> wrote:
> 
>> Same here. I wasn't suggesting standardising it, merely that for
>> implementations that have this concept, a way of providing it across
>> ERROR exceptions and more complex hierarchical exceptions would be nice.
> 
> This was discussed extensively, and as yet, while we would all like  
> something like this, we have not been able to find a way to do it that  
> accurately reflects current practice well enough for widespread adoption.

 
I found this recent discussion interesting, but somewhat tangential to my original proposal, which attempted merely to make error handling usable in a WG1 setting. I'm quite happy with the object raised by ERROR being implementation-defined in WG1. Accessing the message and irritants of an error gives you about the level of functionality enjoyed by LOGO programmers 30 years ago: they could catch errors and write out the message produced by an error. I feel comfortable saying that this part of the proposal in no way reflects new language design, but merely long-standing practice. 

On the subject of (raise 4), I would be dubious of any argument about exception types based upon errno. :) 

-- vincent
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