[Networkagent-developers] Re: Potential change in error type

[Theodore H. <tw...@do...>]

"Francis G. McCabe" <fg...@ca...> wrote:
> the list of codes I have come up with so far is:
> 
> @table @code
> @item 'matcherr
> This is raised when a match failed in a situation where it is not safe
> for it to do so.
> @item 'privileged
> This is raised when a privilege violation is flagged -- such as
> attempting to execute a privileged operation, or an invalid access to
> teh file system.
> @item 'system
> This is raised when the operation is potentially correct but the system
> could not honour it -- due to space limitation for example.
> @item 'exec
> This is raised when attempting an illegal instruction or executing
> non-valid code.
> @item 'compval
> This is raised when attempting to compare incomparible values -- such as
> two code segments.
> @item 'invalid
> This is raised when arguments have invalid values -- such as attempting
> to take the square root of a negative number.

This is pretty broad.  A separate 'list error would be useful -- like trying
to take the head of an empty list, or to reduce a list of one element.
Also 'bounds -- trying to reference a list index that is out of bounds.

> @item 'arith
> This is raised when an arithmetic operation raised a problem -- such as
> divide by zero.
> @item 'abort
> This is raised when the user causes the system to abort.
> @item 'fail
> This is raised when an operation fails -- such as attempting to open a
> nn-existent for reading.

Also pretty broad -- I'd like to see this expanded a bit more, maybe
like 'io (file I/O error), 'net (network error), any others?

> @item 'eof
> This is raised when attempting to read past the end of file.
> @end table

Where does a cast error go?  (trying to unsuccessfully cast a value from
one type to another, like number%%"qqq").

theo