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Matthew Flatt 5500ad5b86 new error message convention
Add `raise-argument-error', `raise-result-error', `raise-arguments-error',
and `raise-range-error'.

The old convention was designed for reporting on a single (sometimes very
long line). The new convention is

 <name>: <short message>
   <field>: <detail>
   ...

If <detail> is long or itself spans multiple lines, then it may
also use the form

   <field>:
    <detail>

where each line of <detail> is indented by 3 spaces.

Backtrace information is shown as a multi-line "context" field.

original commit: 9e7548de615610a5be2adb33c4cf6ee10f9e7589
2012-05-25 15:08:05 -06:00
collects new error message convention 2012-05-25 15:08:05 -06:00