## Function: COMMON-LISP:MACROEXPAND
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> Repetitively call MACROEXPAND-1 until the form can no longer be expanded.
> Returns the final resultant form, and T if it was expanded. ENV is the
> lexical environment to expand in, or NIL (the default) for the null
> environment.

### Lambda list
```cl
(sb-kernel:form &optional sb-impl::env)
```