From fa2fa0b2e6ca0fbfb9a9278af211d4ef533b6791 Mon Sep 17 00:00:00 2001
From: Hugo Herbelin <Hugo.Herbelin@inria.fr>
Date: Sat, 9 Apr 2016 16:15:15 +0200
Subject: Simplifying code for printing VERNAC EXTEND.

---
 printing/ppvernac.ml | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/printing/ppvernac.ml b/printing/ppvernac.ml
index 0b761881d..9054ba0b6 100644
--- a/printing/ppvernac.ml
+++ b/printing/ppvernac.ml
@@ -1213,22 +1213,15 @@ module Make
         with Failure _ -> str "<error in " ++ str (fst s) ++ str ">" in
       try
         let rl = Egramml.get_extend_vernac_rule s in
-        let start,rl,cl =
-          match rl with
-            | Egramml.GramTerminal s :: rl -> str s, rl, cl
-            | Egramml.GramNonTerminal _ :: rl -> pr_arg (List.hd cl), rl, List.tl cl
-            | [] -> anomaly (Pp.str "Empty entry") in
-        let (pp,_) =
-          List.fold_left
-            (fun (strm,args) pi ->
-              let pp,args = match pi with
-                | Egramml.GramNonTerminal _ -> (pr_arg (List.hd args), List.tl args)
-                | Egramml.GramTerminal s -> (str s, args) in
-              (strm ++ spc() ++ pp), args)
-            (start,cl) rl in
-        hov 1 pp
+        let rec aux rl cl =
+          match rl, cl with
+          | Egramml.GramNonTerminal _ :: rl, arg :: cl -> pr_arg arg :: aux rl cl
+          | Egramml.GramTerminal s :: rl, cl -> str s :: aux rl cl
+          | [], [] -> []
+          | _ -> assert false in
+        hov 1 (pr_sequence (fun x -> x) (aux rl cl))
       with Not_found ->
-        hov 1 (str "TODO(" ++ str (fst s) ++ prlist_with_sep sep pr_arg cl ++ str ")")
+        hov 1 (str "TODO(" ++ str (fst s) ++ spc () ++ prlist_with_sep sep pr_arg cl ++ str ")")
 
     in pr_vernac
 
-- 
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