Merge PR #13826: [micromega] Fixes #13794

Reviewed-by: vbgl

1 files changed, 39 insertions, 0 deletions

diff --git a/test-suite/micromega/bug_13794.v b/test-suite/micromega/bug_13794.v
new file mode 100644
index 0000000000..5e303a0b7f
--- /dev/null
+++ b/test-suite/micromega/bug_13794.v
@@ -0,0 +1,39 @@
+From Coq Require Import Lia ZArith.ZArith NArith.NArith.
+Unset Nia Cache.
+
+Open Scope N_scope.
+
+
+Lemma over (n0 n1 n2 n3 n4 n5 n6 : N)
+  (e0 : 1 + 8 * n0 = n1 * n1 + n2)
+  (e1 : n1 - 1 = 2 * n3 + n4)
+  (e2 : n3 * (1 + n3) = 2 * n5)
+  (e3 : n2 + 2 * n4 * n1 - n4 = 8 * n6)
+  (o0 : n4 = 0 \/ n4 = 1) :
+  n6 = n0 - n5.
+Proof.
+  Time nia.
+Qed.
+
+Lemma over2 (n0 n1 n2 n3 n4 n5 n6 : N)
+  (e0 : 1 + 8 * n0 = n1 * n1 + n2)
+  (e1 : n1 + 1 = 2 * n3 + n4)
+  (e2 : n3 * (1 + n3) = 2 * n5)
+  (e3 : n2 + 2 * n4 * n1 + n4 = 8 * n6)
+  (o0 : n4 = 0) :
+  n6 = n0 + n5.
+Proof.
+  Fail nia.
+Abort.
+
+Open Scope Z_scope.
+
+Lemma over3 (n1 n2 n3 n4 n5 : Z)
+  (e : 0 <= n1 /\ 0 <= n2 /\ 0 <= n3 /\ 0 <= n4
+   /\ 0 <= n5)
+  (e1 : n1 + 1 = 20 * n3 + n4)
+  (e3 : n2 + 2 * n4 * n1 + n4 = 8 * n5) :
+  n5 = 0.
+Proof.
+Time Fail nia.
+Abort.