clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
(* Title: HOL/HOLCF/Plain_HOLCF.thy
Author: Brian Huffman
*)
section {* Plain HOLCF *}
theory Plain_HOLCF
imports Cfun Sfun Cprod Sprod Ssum Up Discrete Lift One Tr Fix
begin
text {*
Basic HOLCF concepts and types; does not include definition packages.
*}
hide_const (open) Filter.principal
end