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(librep.info)Function Exits

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Function Exits
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   `librep' has no explicit `return' statement, as found in most other
languages. Where a value has to returned from a function before the
function would normally exit, a `catch'/`throw' pair may be used.

   For example:

     (defun foo (x y)
       (catch 'return
          (when (= x 2)
            (throw 'return nil))
          ...