[cmucl-imp] Re: Compiled COMPILE forms at load time Bug

[Nikodemus Siivola]

On 12 March 2010 14:01, Raymond Toy <toy.raymond at gmail.com> wrote:
> On 3/10/10 1:47 PM, Helmut Eller wrote:
>> One more thing:
>>
>> (defmacro bar () 1)
>> (compile 'bar '(lambda () 2))
>>
>> should remove the macro binding for bar.
>>
>
> Hmm.  The CLHS entry for COMPILE says:
>
>        if name is a symbol  that names a macro, its macro function is updated
>
> What is that supposed to mean?  The macro binding should be removed?
> That we're defining a new macro expansion for that symbol?

I believe it means this (which is the SBCL take on the subject):

CL-USER> (defmacro foo () "old FOO")
FOO
CL-USER> (foo)
"old FOO"
CL-USER> (compile 'foo `(lambda (form env)
                          (declare (ignore form env))
                          "new FOO"))
FOO
NIL
NIL
CL-USER> (foo)
"new FOO"

Cheers,

 -- Nikodemus