prefer top-down rewriting for output (i.e. uncheck), in accordance to term abbreviations (see 5d2fe4e09354) and AST translations;
(* Title: HOL/HOLCF/IOA/ABP/Action.thy
Author: Olaf Müller
*)
header {* The set of all actions of the system *}
theory Action
imports Packet
begin
datatype 'm action =
Next | S_msg 'm | R_msg 'm
| S_pkt "'m packet" | R_pkt "'m packet"
| S_ack bool | R_ack bool
end