module type LOG =sig..end
type 
type 
type 
val state : state -> unit
val shift : terminal ->
       state -> unit
val reduce_or_accept : production -> unit
val lookahead_token : terminal ->
       Lexing.position -> Lexing.position -> unit
val initiating_error_handling : unit -> unit
val resuming_error_handling : unit -> unit
val handling_error : state -> unit