Correct usage of destructuring-bind

I'm experimenting with destructuring-bind as follows:

(destructuring-bind
           (a  b) '(1  2) (list a b)))

When I evaluate this in the REPL I get:

READ from #1=#<INPUT STRING-INPUT-STREAM>: an object cannot start with #\)
 开发者_运维问答  [Condition of type SYSTEM::SIMPLE-READER-ERROR]

I expected the result to be

(1 2)

The error doesn't mean anything to me, in the context of the code above.

I realise that I'm just binding a simple list of arguments, rather than a tree, but I still expecteded this to work. Any clues as to where I've gone wrong?

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Remove the extra ) on the end. Works fine.

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While we are at it, the usual formatting is:

(destructuring-bind (a  b)
    '(1  2)
  (list a b))

It also makes it easier to see how the parentheses match. Generally the editor will also help. Placing the cursor after a closing parenthesis should highlight the corresponding opening parenthesis. Also note that all self-respecting Lisp-syntax-capable editors have a command to find non-matching parentheses.