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{ nixpkgs }: let pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ ]; config = { problems.matchers = [ { package = "a"; handler = "error"; } ]; }; }; in pkgs.stdenvNoCC.mkDerivation { pname = "a"; version = "0"; meta.maintainers = [ "hello" ]; meta.description = "Some package"; }