5.2.1. Toplevel definitions, on p. 19, does not specify what happens
when we encounter

   (define foo 1)

if FOO has already been previously bound to a transformer by a syntax
definition.  And vice versa for par. 5.3.

This has some consequences for the literal matching rules on p 17.  For example,
the following is well defined

(define else 1)
(define-syntax cond .......)
(define else 2)  ; this is just a set! so does not change the location to
                  ; which ELSE is bound
(cond (else "matches else"))  ==> matches else

but the following isn't well-defined

(define-syntax else .......)
(define-syntax cond .......)
(define else 2)  ; not just a set! any more
(cond (else "matches else"))  ==> does this match ELSE or not?

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