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get_char/[1,2]
ISOget_char(-Char)
get_char(+Stream, -Char)
Unifies Char with the next char from Stream or
with end_of_file
if there are no more characters.
stream_object, must be ground.
Valid input text stream, defaults to the current input stream.
char or one of [end_of_file
]
Stream errors (see ref-iou-sfh-est), plus:
permission_error
Trying to read beyond end of Stream