If a @<value-form> is omitted, then the value of the corresponding @<var>
is used. It is conventional usage for a macro to wrap @|once-only| around
its body so as to convert the arguments which it should evaluate into safe
If a @<value-form> is omitted, then the value of the corresponding @<var>
is used. It is conventional usage for a macro to wrap @|once-only| around
its body so as to convert the arguments which it should evaluate into safe