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diff --git a/src/SpecificGen/GF25519_32Reflective/Reified/Pack.v b/src/SpecificGen/GF25519_32Reflective/Reified/Pack.v
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+++ b/src/SpecificGen/GF25519_32Reflective/Reified/Pack.v
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+Require Import Crypto.SpecificGen.GF25519_32Reflective.CommonUnOpFEToWire.
+
+Definition rpackZ_sig : rexpr_unop_FEToWire_sig pack. Proof. reify_sig. Defined.
+Definition rpackW := Eval vm_compute in rword_of_Z rpackZ_sig.
+Lemma rpackW_correct_and_bounded_gen : correct_and_bounded_genT rpackW rpackZ_sig.
+Proof. rexpr_correct. Qed.
+Definition rpack_output_bounds := Eval vm_compute in compute_bounds rpackW ExprUnOpFEToWire_bounds.
+Local Obligation Tactic := intros; vm_compute; constructor.
+Program Definition rpackW_correct_and_bounded
+ := ExprUnOpFEToWire_correct_and_bounded
+ rpackW pack rpackZ_sig rpackW_correct_and_bounded_gen
+ _ _.
+
+Local Open Scope string_scope.
+Compute ("Pack", compute_bounds_for_display rpackW ExprUnOpFEToWire_bounds).
+Compute ("Pack overflows? ", sanity_compute rpackW ExprUnOpFEToWire_bounds).
+Compute ("Pack overflows (error if it does)? ", sanity_check rpackW ExprUnOpFEToWire_bounds).