diff options
author | Enrico Tassi <gareuselesinge@debian.org> | 2016-12-27 16:53:30 +0100 |
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committer | Enrico Tassi <gareuselesinge@debian.org> | 2016-12-27 18:33:25 +0100 |
commit | 1b92c226e563643da187b8614d5888dc4855eb43 (patch) | |
tree | c4c3d204b36468b58cb71050ba95f06b8dd7bc2e /test-suite/bugs/closed/4745.v | |
parent | 7c9b0a702976078b813e6493c1284af62a3f093c (diff) |
Imported Upstream version 8.6
Diffstat (limited to 'test-suite/bugs/closed/4745.v')
-rw-r--r-- | test-suite/bugs/closed/4745.v | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/test-suite/bugs/closed/4745.v b/test-suite/bugs/closed/4745.v new file mode 100644 index 00000000..c090125e --- /dev/null +++ b/test-suite/bugs/closed/4745.v @@ -0,0 +1,35 @@ +(*I get an Anomaly in the following code. + +```*) +Require Vector. + +Module M. + Lemma Vector_map_map : + forall A B C (f : A -> B) (g : B -> C) n (v : Vector.t A n), + Vector.map g (Vector.map f v) = Vector.map (fun a => g (f a)) v. + Proof. + induction v; simpl; auto using f_equal. + Qed. + + Lemma Vector_map_map_transparent : + forall A B C (f : A -> B) (g : B -> C) n (v : Vector.t A n), + Vector.map g (Vector.map f v) = Vector.map (fun a => g (f a)) v. + Proof. + induction v; simpl; auto using f_equal. + Defined. + (* Anomaly: constant not found in kind_of_head: Coq.Vectors.Vector.t_ind. Please report. *) + + (* strangely, explicitly passing the principle to induction works *) + Lemma Vector_map_map_transparent' : + forall A B C (f : A -> B) (g : B -> C) n (v : Vector.t A n), + Vector.map g (Vector.map f v) = Vector.map (fun a => g (f a)) v. + Proof. + induction v using Vector.t_ind; simpl; auto using f_equal. + Defined. +End M. +(*``` + +Changing any of the following things eliminates the Anomaly + * moving the lemma out of the module M to the top level + * proving the lemma as a Fixpoint instead of using induction + * proving the analogous lemma on lists instead of vectors*) |