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+Module Foo. 
+  Inductive True2:Prop:= I2: (False->True2)->True2.
+
+  Axiom Heq: (False->True2)=True2.
+  
+  Fail Fixpoint con (x:True2) :False :=
+    match x with
+        I2 f => con (match Heq with @eq_refl _ _ => f end)
+    end.
+End Foo.
+
+Require Import ClassicalFacts.
+
+Inductive True1 : Prop := I1 : True1
+with True2 : Prop := I2 : True1 -> True2.
+
+Section func_unit_discr.
+
+Hypothesis Heq : True1 = True2.
+
+Fail Fixpoint contradiction (u : True2) : False :=
+contradiction (
+    match u with
+      | I2 Tr =>
+         match Heq in (_ = T) return T with
+         | eq_refl => Tr
+         end
+    end).
+
+End func_unit_discr.
+
+Require Import Vectors.VectorDef.
+
+About caseS.
+About tl.
+Open Scope vector_scope.
+Local Notation "[]" := (@nil _).
+Local Notation "h :: t" := (@cons _ h _ t) (at level 60, right associativity).
+Definition is_nil {A n} (v : t A n) : bool := match v with [] => true | _ => false end.
+
+Fixpoint id {A n} (v : t A n) : t A n :=
+  match v in t _ n' return t A n' with
+    | (h :: t) as v' => h :: id (tl v')
+    |_ => []
+  end.