Macro Forms as Places (ANSI and GNU Common Lisp Document)

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#### 5.1.2.7 Macro Forms as Places

A macro form can be used as a place, in which case Common Lisp expands the macro form

as if by macroexpand-1

and then uses the macro expansion in place of the original place.

Such macro expansion is attempted only after exhausting all other possibilities other than expanding into a call to a function named `(setf reader)`.