[Chicken-janitors] #416: Make stock errors more usable programmatically

[Chicken Trac]

#416: Make stock errors more usable programmatically
----------------------------+-----------------------------------------------
 Reporter:  syn             |       Owner:       
     Type:  enhancement     |      Status:  new  
 Priority:  minor           |   Milestone:  4.7.0
Component:  core libraries  |     Version:  4.6.x
 Keywords:                  |  
----------------------------+-----------------------------------------------
 If I call {{{(with-input-from-file "foo" read)}}} with foo being a non-
 existant file, I get the following exception:

 {{{
 condition: (exn i/o file)
  exn
         message: "cannot open file - No such file or directory"
         arguments: ("foo")
         location: open-input-file
  i/o
  file
 }}}

 The actual cause of this file i/o error was that the file didn't exist,
 however, only the error message containts this information. It would be
 nice if there was an additional property (maybe a symbol) that would allow
 for better programmatic handling of this other than the message itself
 (which is likely to change in future versions). This probably applies to
 other errors in the core, as well. This is mainly a suggestion. Any
 comments or better ideas?

-- 
Ticket URL: <http://bugs.call-cc.org/ticket/416>
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