The Consing Dot (ANSI and GNU Common Lisp Document)

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#### 2.3.3 The Consing Dot

If a token consists solely of dots (with no escape characters), then an error of type reader-error is signaled, except in one circumstance: if the token is a single dot and appears in a situation where dotted pair notation permits a dot, then it is accepted as part of such syntax and no error is signaled. See Left-Parenthesis.