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> > The only way to supply contructor functions in SRFI-10 is by doing > > (define-reader-ctor <symbol> <proc>). > > No. The only requirement SRFI-10 mandates is that "There must be a way > to declare an association between a symbolic tag and the corresponding > constructor-procedure." SRFI-10 goes on to _suggest_ that an > implementation may want to implement a define-reader-ctor function for > that purpose. SRFI-10 does not say that define-reader-ctor is the > required method to build tag-constructor associations, let alone that > it is the only method (see also below). There is another alternative for defining the constructors within the source code. You could simply use the #,(...) form itself to perform a definition while the program is being read. For example you could: '#,(define-reader-ctor 'box list) '#,(define-reader-ctor 'f32 f32vector) (define x '(things #,(box 123) #,(f32 1.0 2.0 3.0))) Note that this assumes that define-reader-ctor is itself declared as a reader constructor. This doesn't solve the problem of specifying to the compiler any non-standard procedures that are to be passed to define-reader-ctor, but at least it will work when the constructors can be expressed in standard Scheme. I don't actually like this approach, but I mention it for the record. Marc