fact: Definition is_neg_arrow (l:literal) : bool := match l with | POS _ => false | NEG f => is_arrow f.(elt) end.
imports: Cdcl.PatriciaR Cdcl.KeyInt Cdcl.ReifClasses Cdcl.Lib Bool Setoid ZifyBool ZArith Uint63 Lia List Cdcl.Syntax Cdcl.Clause