// stdio.asm:	WORD p_unstream,'UNSTREAM',fasm

anchor:p_unstream[]

=== Word: UNSTREAM
....
Data stack: ( stream* -- )
....

"UNSTREAM" is a function word that releases the memory allocated for a
stream, and closes the associated file if it's a file stream.

==== File descriptor backed stream

This kind of stream has the stream header as a prefix within the
allocated memory. Thus, stream* is the base address for the memory to
reclaim, and the size of this is determined from the cell at (stream*
+ 16) plus the 32 bytes head itself.

==== Memory block backed STREAM

This kind of stream has a separate header which points at the memory
area to reclaim. The cell at stream* is the base address, and the cell
at (stream* + 16) is its size.