On 22 Jun 2018, at 23:55, Stas Boukarev wrote:

On Fri, Jun 22, 2018 at 5:13 PM Robert Goldman <rpgold...@sift.info> wrote:

I have a library that provides DEF-UNIMPLEMENTED as a macro for defining stub functions. When you compile a file with unimplemented functions, you
get a warning of the type FOO:UNIMPLEMENTED-STUB in my library FOO.

I'd like to put in an asdf system definition a file spec something like

(:file "file-with-stubs"
:method (:around (o c) 
 (handler-bind ((foo:unimplemented-stub
                              #'(lambda (c)
                                  (print c)
                                  (muffle-warning c))

but, of course, the package foo doesn't exist when this is read (although I could put (asdf:load-system "foo") upstream of the enclosing defsystem).

This isn't a case that's nicely consistent with Faré's hack for
translating strings or keyword symbols, nor does it seem easy to use
find-symbol for this purpose.

You could still use FIND-SYMBOL:
(handler-bind ((error (lambda (c) (when (typep c (find-symbol x :foo))))))

That's a good point, and effectively what I ended up doing. But it's certainly not pleasing, because we end up doing our own type dispatch, on top of that which is built into CL with `handler-bind`. Still, this might be the best I can do.


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