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| ANSI Common Lisp 10 Symbols 10.2 Dictionary of Symbols
10.2.17 boundp | Function
  Syntax: boundp symbol generalized-boolean Arguments and Values: symbol - a symbol. generalized-boolean - a generalized boolean. Description: Returns true if symbol is bound; otherwise, returns false. Examples:
       (setq x 1)  1
       (boundp 'x)  true
       (makunbound 'x)   X
       (boundp 'x)  false
       (let ((x 2)) (boundp 'x))  false
       (let ((x 2)) (declare (special x)) (boundp 'x))  true
Exceptional Situations: Should signal an error of type type-error if symbol is not a symbol. See Also: set, setq, symbol-value, makunbound Notes: The function bound determines only whether a symbol has a value in the global environment; any lexical bindings are ignored. Allegro CL Implementation Details: None.

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