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  ANSI Common Lisp   2 Syntax   2.1 Character Syntax   2.1.4 Character Syntax Types

2.1.4.3 Invalid Characters

Characters with the constituent trait invalid cannot ever appear in a token except under the control of a single escape character. If an invalid character is encountered while an object is being read, an error of type reader-error is signaled. If an invalid character is preceded by a single escape character, it is treated as an alphabetic2 constituent instead.

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