From 95b4a54ec6a9aacffe8c11df1b443d36b9f6dda7 Mon Sep 17 00:00:00 2001
From: Pierre Letouzey
Date: Tue, 12 May 2015 16:48:01 +0200
Subject: Extraction: fix the detection of the "polyprop" situation

 The ~polyprop argument wasn't propagated properly anymore,
 leading the extraction to try to operate on situations it cannot
 handle (yet). Cf Table.error_singleton_become_prop for more details.

 Regression test added.
---
 kernel/inductive.ml                      |  2 +-
 test-suite/success/extraction_polyprop.v | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 test-suite/success/extraction_polyprop.v

diff --git a/kernel/inductive.ml b/kernel/inductive.ml
index ca814f497c..088b99b9e0 100644
--- a/kernel/inductive.ml
+++ b/kernel/inductive.ml
@@ -214,7 +214,7 @@ let constrained_type_of_inductive_knowing_parameters env ((mib,mip),u as pind) a
     (ty, cst)
 
 let type_of_inductive_knowing_parameters env ?(polyprop=false) mip args = 
-  type_of_inductive_gen env mip args
+  type_of_inductive_gen ~polyprop env mip args
 
 (* The max of an array of universes *)
 
diff --git a/test-suite/success/extraction_polyprop.v b/test-suite/success/extraction_polyprop.v
new file mode 100644
index 0000000000..7215bd9905
--- /dev/null
+++ b/test-suite/success/extraction_polyprop.v
@@ -0,0 +1,11 @@
+(* The current extraction cannot handle this situation,
+   and shouldn't try, otherwise it might produce some Ocaml
+   code that segfaults. See Table.error_singleton_become_prop
+   or S. Glondu's thesis for more details. *)
+
+Definition f {X} (p : (nat -> X) * True) : X * nat :=
+  (fst p 0, 0).
+
+Definition f_prop := f ((fun _ => I),I).
+
+Fail Extraction f_prop.
-- 
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