proposition: Lemma FixInt_exp2_Word_pow2_N {size} : FixInt.exp2 size = N.of_nat (Word.pow2 size).
proof: Proof. rewrite <- Npow2_nat'; apply FixInt_exp2_Word_Npow2. Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat CertifiedExtraction.Extraction.BinEncoders.Basics Coq.Lists.List Bedrock.Word Program