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(librep.info)Destroying File Objects

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Destroying File Objects
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   The easiest way to close a file is simply to eliminate all
references to it, subsequently the garbage collector will close it for
you. It is better to close files explicitly though since only a limited
number of files may be opened concurrently.

 - Function: close-file file-object
     This function closes the file pointed to by the file object
     FILE-OBJECT.

     Subsequently, any stream accesses FILE-OBJECT are illegal and will
     signal an error.