/usr/lib/s9fes/help/close-input-port is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 | 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.
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