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/usr/lib/s9fes/help/close-input-port is in scheme9 2010.11.13-2.

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R4RS 6.10  (close-input-port input-port)    ==>  unspecific
           (close-output-port output-port)  ==>  unspecific

Closes the file associated with INPUT-PORT or OUTPUT-PORT respectively,
rendering the port incapable of delivering or accepting characters.

These routines have no effect if the file has already been closed.
The value returned is unspecified.