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| ANSI Common Lisp 17 Sequences 17.3 Dictionary of Sequences
17.3.3 elt | Accessor
  Syntax: elt sequence index object (setf (elt sequence index) new-object) Arguments and Values: sequence - a proper sequence. index - a valid sequence index for sequence. object - an object. new-object - an object. Description: Accesses the element of sequence specified by index. Examples:
       (setq str (copy-seq "0123456789"))  "0123456789"
       (elt str 6)  #\6
       (setf (elt str 0) #\#)  #\#
       str  "#123456789"
Exceptional Situations: Should be prepared to signal an error of type type-error if sequence is not a proper sequence. Should signal an error of type type-error if index is not a valid sequence index for sequence. See Also: aref, nth, Section 3.2.1 Compiler Terminology Notes: aref may be used to access vector elements that are beyond the vector's fill pointer. Allegro CL Implementation Details: None.

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