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{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc865", doBenchmark ? false } : let variant = if doBenchmark then nixpkgs.pkgs.haskell.lib.doBenchmark else nixpkgs.pkgs.lib.id; verismith = nixpkgs.pkgs.haskellPackages.callCabal2nix "verismith" (./.) {}; in variant verismith