From a4c7f8bd98be2a200489325ff7c5061cf80ab4f3 Mon Sep 17 00:00:00 2001
From: Enrico Tassi <gareuselesinge@debian.org>
Date: Tue, 27 Dec 2016 16:53:30 +0100
Subject: Imported Upstream version 8.6

---
 test-suite/failure/positivity.v | 46 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

(limited to 'test-suite/failure/positivity.v')

diff --git a/test-suite/failure/positivity.v b/test-suite/failure/positivity.v
index 91de8733..8089de2b 100644
--- a/test-suite/failure/positivity.v
+++ b/test-suite/failure/positivity.v
@@ -5,5 +5,47 @@
 (*    //   *      This file is distributed under the terms of the       *)
 (*         *       GNU Lesser General Public License Version 2.1        *)
 (************************************************************************)
-Fail Inductive t : Set :=
-    c : (t -> nat) -> t.
+
+(* Negative occurrence *)
+Fail Inductive t : Type :=
+  c : (t -> nat) -> t.
+
+(* Non-strictely positive occurrence *)
+Fail Inductive t : Type :=
+  c : ((t -> nat) -> nat) -> t.
+
+(* Self-nested type (no proof of
+   soundness yet *)
+Fail Inductive t (A:Type) : Type :=
+  c : t (t A) -> t A.
+
+(* Nested inductive types *)
+
+Inductive pos (A:Type) :=
+  p : pos A -> pos A.
+
+Inductive nnpos (A:Type) :=
+  nnp : ((A -> nat) -> nat) -> nnpos A.
+
+Inductive neg (A:Type) :=
+  n : (A->neg A) -> neg A.
+
+Inductive arg : Type -> Prop :=
+  a : forall A, arg A -> arg A.
+
+(* Strictly covariant parameter: accepted. *)
+Fail Fail Inductive t :=
+  c : pos t -> t.
+
+(* Non-strictly covariant parameter: not
+   strictly positive. *)
+Fail Inductive t :=
+  c : nnpos t -> t.
+
+(* Contravariant parameter: not positive. *)
+Fail Inductive t :=
+  c : neg t -> t.
+
+(* Strict index: not positive. *)
+Fail Inductive t :=
+  c : arg t -> t.
-- 
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