Function: COMMON-LISP:MACROEXPAND-1

package type clhs github

If form is a macro (or symbol macro), expand it once. Return two values, the expanded form and a T-or-NIL flag indicating whether the form was, in fact, a macro. ENV is the lexical environment to expand in, which defaults to the null environment.

Lambda list

(sb-kernel:form &optional sb-impl::env)