Common Lisp the Language, 2nd Edition
X3J13 voted in March 1989 (DESTRUCTURING-BIND)
to make the destructuring feature of defmacro
available as a separate facility.
[Macro]
destructuring-bind lambda-list expression {declaration}* {form}*
This macro binds the variables specified in lambda-list to the corresponding values in the tree structure resulting from evaluating the expression, then executes the forms as an implicit progn.
A destructuring-bind lambda-list may contain the lambda-list keywords &optional, &rest, &key, &allow-other-keys, and &aux; &body and &whole may also be used as they are in defmacro, but &environment may not be used. Nested and dotted lambda-lists are also permitted as for defmacro. The idea is that a destructuring-bind lambda-list has the same format as inner levels of a defmacro lambda-list.
If the result of evaluating the expression does not match the
destructuring pattern, an error should be signaled.
