Lexical environment and compiler macro functions.

G'day,

CMUCL does not shadow the compiler macro function present in the
global environment when introducing a function with the same name in
the current lexical environment. This is demonstrated with the
following example:

  (defun square (x)
    (expt x 2))

  (define-compiler-macro square (&whole form arg)
    (declare (ignore arg))
    form)

  (defun test ()
    (flet ((square (arg)
             (declare (ignore arg))
             (write "SQUARE!")))
      (macrolet ((my-square (arg &environment env)
                   (if (compiler-macro-function 'square env)
                       `(function square)
                       nil)))
        (my-square 1))))

  (test)
  => #<Function (FLET SQUARE TEST) {48704B89}>

Thanks
Mark

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