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(r5rs) Assignments

Info Catalog (r5rs) Conditionals (r5rs) Primitive expression types
 
 4.1.6 Assignments
 -----------------
 
  -- syntax: set! <variable> <expression>
      <Expression> is evaluated, and the resulting value is stored in
      the location to which <variable> is bound.  <Variable> must be
      bound either in some region enclosing the `set!' expression or at
      top level.  The result of the `set!' expression is unspecified.
 
      (define x 2)
      (+ x 1)                                ==>  3
      (set! x 4)                             ==>  _unspecified_
      (+ x 1)                                ==>  5
 
 
Info Catalog (r5rs) Conditionals (r5rs) Primitive expression types
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