I'd like to create a new exception type, 'exn:fail:insufficient-space',
something like this:
(struct exn:fail:insufficient-space exn:fail (requested available source))
I would like to do two things:
1) Make the exn-message field be standardized so that the person throwing
the exception doesn't need to (or, ideally, cannot) set it.
2) Apply a contract so that only valid arguments can be supplied.
I could do both of these with a 'guard' statement and an external function
definition:
(define/contract (zot msg ccm req avail src type)
(values "Insufficient space" ccm req avail src))
(struct exn:fail:insufficient-space exn:fail (requested available source)
#:guard zot)
...but this gives me a top-level definition that I don't want and need to
remember to not export. I've been through the sections on contracts and
local bindings and I don't see a way to apply one to a raw lamdba -- is
there one?
I also don't see a way to make it so that the fields inherited from the
superclass will default and not need to be specified by the caller. There
is the 'struct-defaults' package but that is lacking documentation and I'm
not sure it works for defaulting the fields of a superclass.
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