+ | NDot _ -> "##."
+ | NSemicolon _ -> "##;"
+ | NBranch _ -> "##["
+ | NShift _ -> "##|"
+ | NPos (_, l) -> "##" ^String.concat "," (List.map string_of_int l)^ ":"
+ | NWildcard _ -> "##*:"
+ | NMerge _ -> "##]"
+ | NFocus (_,l) ->
+ Printf.sprintf "##focus %s"
+ (String.concat " " (List.map string_of_int l))
+ | NUnfocus _ -> "##unfocus"
+ | NSkip _ -> "##skip"
+ | NTry (_,tac) -> "ntry (" ^ pp_ntactic ~map_unicode_to_tex tac ^ ")"
+ | NAssumption _ -> "nassumption"