GNU Info

(texinfo)result

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`@result{}' (=>): Indicating Evaluation
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  Use the `@result{}' command to indicate the result of evaluating an
expression.

  The `@result{}' command is displayed as `=>' in Info and as a double
stemmed arrow in the printed output.

  Thus, the following,

     (cdr '(1 2 3))
          => (2 3)

may be read as "`(cdr '(1 2 3))' evaluates to `(2 3)'".