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-rw-r--r--test-suite/bugs/closed/bug_11321.v10
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diff --git a/test-suite/bugs/closed/bug_11321.v b/test-suite/bugs/closed/bug_11321.v
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+Require Import Cyclic63.
+
+Goal False.
+Proof.
+assert (4294967296 *c 2147483648 = WW 2 0)%int63 as H.
+ vm_cast_no_check (@eq_refl (zn2z int) (WW 2 0)%int63).
+generalize (f_equal (zn2z_to_Z wB to_Z) H).
+now rewrite mulc_WW_spec.
+Fail Qed.
+Abort.