[plt-scheme] Problems with dynamic-require and eval

Hi all,

The following snippet produces the output:

     (1 2 3). reference to undefined identifier: mergesort

Why?

   (let ((n (make-namespace)))
       (parameterize ([current-namespace n])
         (dynamic-require '(lib "list.ss") 'mergesort)
         (display (mergesort '(2 1 3) <))
         (eval '(mergesort '(5 4 6) <))))

The documentation for dynamic-require states that
the the name is imported into the current namespace,
which is what eval uses to evaluate the given expression.

For my purpose, I can use namespace-require in stead,
but I am curious to know, what I have missed.

-- 
Jens Axel Søgaard