## Generic-function: SB-GRAY:STREAM-READ-CHAR-NO-HANG
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> This is used to implement READ-CHAR-NO-HANG. It returns either a
> character, or NIL if no input is currently available, or :EOF if
> end-of-file is reached. The default method provided by
> FUNDAMENTAL-CHARACTER-INPUT-STREAM simply calls STREAM-READ-CHAR; this
> is sufficient for file streams, but interactive streams should define
> their own method.

### Lambda list
```cl
(stream)
```