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  ANSI Common Lisp   2 Syntax   2.4 Standard Macro Characters   2.4.8 Sharpsign Sharpsign Dot is read as the object resulting from the evaluation of the object represented by foo. The evaluation is done during the read process, when the #. notation is encountered. The #. syntax therefore performs a read-time evaluation of foo.

The normal effect of #. is inhibited when the value of *read-eval* is false. In that situation, an error of type reader-error is signaled.

For an object that does not have a convenient printed representation, a form that computes the object can be given using the #. notation.

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