7

Does something already exist to do this?

(defun good (var)
     (and (boundp 'var) var))
14

There is a macro defined in bindings.el that does exactly that:

(defmacro bound-and-true-p (var)
  "Return the value of symbol VAR if it is bound, else nil."
  `(and (boundp (quote ,var)) ,var))
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9

How about this:

bound-and-true-p is a Lisp macro in `bindings.el'.

(bound-and-true-p VAR)

Return the value of symbol VAR if it is bound, else nil.
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