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| Allegro CL

| 3.1 Evaluation 3.1.2 The Evaluation Model 3.1.2.1 Form Evaluation 3.1.2.1.1 Symbols as Forms ### 3.1.2.1.1.4 Symbols Naming Both Lexical and Dynamic Variables The same symbol can name both a lexical variable and a dynamic variable, but never in the same lexical environment. In the following example, the symbol `x` is used, at different times, as the name of a lexical variable and as the name of a dynamic variable.
     (let ((x 1))            ;Binds a special variable X
       (declare (special x))
       (let ((x 2))          ;Binds a lexical variable X
         (+ x                ;Reads a lexical variable X
            (locally (declare (special x))
                     x))))   ;Reads a special variable X
     3

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