CLHS: Section 3.1.2.1.1.4

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## 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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