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14.3.1.2 Evaluating a Variable Reference
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When an expression that consists simply of a variable name is evaluated,
the value of the expression is the value of the named variable. The
evaluation of a variable reference expression has no side effects.
So, after
(define key "Paul Evans")
the value of the expression `key' is the string value `"Paul Evans"'.
If KEY is then modified by
(set! key 3.74)
the value of the expression `key' is the numeric value 3.74.
If there is no variable with the specified name, evaluation of the
variable reference expression signals an error.
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