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local-eval and quote

Hi,

I did some experiments with local-eval and found a funny behaviour of
"defined?". Is it not possible to quote for a local evaluation?

  (define the-environment
    (procedure->macro (lambda (exp env) `',env)))

  (define e (let ((a 3)) (the-environment)))

  (local-eval 'a e)              => 3
  (local-eval '(defined? 'a) e)  => #f

The variable a evaluates to 3 but Guile says, that it is not defined.

-- 
/* In the beginning was the Word: */
typedef long SCM;