(guile.info.gz) Eval Variable

 
 14.3.1.2 Evaluating a Variable Reference
 ........................................
 
 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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