From 4bc80f8513d05f3aceb8d052b8dd59a6b00e3e60 Mon Sep 17 00:00:00 2001
From: letouzey
Date: Mon, 4 Jul 2011 18:05:17 +0000
Subject: Set Extraction KeepSingleton: an option for not decapsulating
 singleton types

 A informative inductive type with one constructor C and one informative arg to C
 is normally extracted as an identity, with C removed, see for example
 the "sig" type. When this new option is set, these singleton types
 are left untouch, providing extracted code which is closer to the initial
 Coq development.

 Feature requested by Wouter Swiestra.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14260 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 plugins/extraction/haskell.ml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'plugins/extraction/haskell.ml')

diff --git a/plugins/extraction/haskell.ml b/plugins/extraction/haskell.ml
index b51a957af3..32ad45c937 100644
--- a/plugins/extraction/haskell.ml
+++ b/plugins/extraction/haskell.ml
@@ -83,7 +83,8 @@ let rec pp_type par vl t =
     | Tmeta _ | Tvar' _ -> assert false
     | Tvar i -> (try pr_id (List.nth vl (pred i)) with _ -> (str "a" ++ int i))
     | Tglob (r,[]) -> pp_global Type r
-    | Tglob (IndRef(kn,0),l) when kn = mk_ind "Coq.Init.Specif" "sig" ->
+    | Tglob (IndRef(kn,0),l)
+	when not (keep_singleton ()) && kn = mk_ind "Coq.Init.Specif" "sig" ->
 	  pp_type true vl (List.hd l)
     | Tglob (r,l) ->
 	  pp_par par
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