Open generic function
Writes a string followed by a newline to an output stream.
write-line output-stream string #key start end => ()
<stream>.
<string>.
<integer>. Default value: 0.
<integer>. Default value: string.size.
io
streams
Writes string followed by a newline sequence to output-stream.
The default method behaves as though it calls write on string and then calls new-line.
If supplied, start and end delimit the portion of string to write to the stream.