create ()
returns a new tail.
extend t v
extends the stream, and will raise an exception if t
has been
closed.
close_exn t
closes t
. Subsequent calls to close_exn
or extend
will raise an exception.
close_if_open t
closes t
, if it's not already closed. If t
is already
closed, then this is a no-op.
is_closed t
returns true iff the stream t
is closed.