#!+sb-doc
"If NAME names a compiler-macro in ENV, return the expansion function, else
return NIL. Can be set with SETF when ENV is NIL."
+ (declare (ignore env))
(legal-fun-name-or-type-error name)
;; Note: CMU CL used to return NIL here when a NOTINLINE declaration
;; was in force. That's fairly logical, given the specified effect