diff --git a/Cargo.nix b/Cargo.nix
deleted file mode 100644
index facad84..0000000
--- a/Cargo.nix
+++ /dev/null
@@ -1,2717 +0,0 @@
-
-# This file was @generated by crate2nix 0.9.0-alpha.1 with the command:
-#   "generate"
-# See https://github.com/kolloch/crate2nix for more info.
-
-{ nixpkgs ? <nixpkgs>
-, pkgs ? import nixpkgs { config = {}; }
-, lib ? pkgs.lib
-, stdenv ? pkgs.stdenv
-, buildRustCrate ? pkgs.buildRustCrate
-  # This is used as the `crateOverrides` argument for `buildRustCrate`.
-, defaultCrateOverrides ? pkgs.defaultCrateOverrides
-  # The features to enable for the root_crate or the workspace_members.
-, rootFeatures ? [ "default" ]
-  # If true, throw errors instead of issueing deprecation warnings.
-, strictDeprecation ? false
-  # Used for conditional compilation based on CPU feature detection.
-, targetFeatures ? []
-  # Whether to perform release builds: longer compile times, faster binaries.
-, release ? true
-  # Additional crate2nix configuration if it exists.
-, crateConfig
-  ? if builtins.pathExists ./crate-config.nix
-    then pkgs.callPackage ./crate-config.nix {}
-    else {}
-}:
-
-rec {
-  #
-  # "public" attributes that we attempt to keep stable with new versions of crate2nix.
-  #
-
-  rootCrate = rec {
-    packageId = "colmena";
-
-    # Use this attribute to refer to the derivation building your root crate package.
-    # You can override the features with rootCrate.build.override { features = [ "default" "feature1" ... ]; }.
-    build = internal.buildRustCrateWithFeatures {
-      inherit packageId;
-    };
-
-    # Debug support which might change between releases.
-    # File a bug if you depend on any for non-debug work!
-    debug = internal.debugCrate { inherit packageId; };
-  };
-  # Refer your crate build derivation by name here.
-  # You can override the features with
-  # workspaceMembers."${crateName}".build.override { features = [ "default" "feature1" ... ]; }.
-  workspaceMembers = {
-    "colmena" = rec {
-      packageId = "colmena";
-      build = internal.buildRustCrateWithFeatures {
-        packageId = "colmena";
-      };
-
-      # Debug support which might change between releases.
-      # File a bug if you depend on any for non-debug work!
-      debug = internal.debugCrate { inherit packageId; };
-    };
-  };
-
-  # A derivation that joins the outputs of all workspace members together.
-  allWorkspaceMembers = pkgs.symlinkJoin {
-      name = "all-workspace-members";
-      paths =
-        let members = builtins.attrValues workspaceMembers;
-        in builtins.map (m: m.build) members;
-  };
-
-  #
-  # "internal" ("private") attributes that may change in every new version of crate2nix.
-  #
-
-  internal = rec {
-    # Build and dependency information for crates.
-    # Many of the fields are passed one-to-one to buildRustCrate.
-    #
-    # Noteworthy:
-    # * `dependencies`/`buildDependencies`: similar to the corresponding fields for buildRustCrate.
-    #   but with additional information which is used during dependency/feature resolution.
-    # * `resolvedDependencies`: the selected default features reported by cargo - only included for debugging.
-    # * `devDependencies` as of now not used by `buildRustCrate` but used to
-    #   inject test dependencies into the build
-
-    crates = {
-      "ansi_term" = rec {
-        crateName = "ansi_term";
-        version = "0.11.0";
-        edition = "2015";
-        sha256 = "16wpvrghvd0353584i1idnsgm0r3vchg8fyrm0x8ayv1rgvbljgf";
-        authors = [
-          "ogham@bsago.me"
-          "Ryan Scheel (Havvy) <ryan.havvy@gmail.com>"
-          "Josh Triplett <josh@joshtriplett.org>"
-        ];
-        dependencies = [
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: (target."os" == "windows");
-            features = [ "errhandlingapi" "consoleapi" "processenv" ];
-          }
-        ];
-        
-      };
-      "async-trait" = rec {
-        crateName = "async-trait";
-        version = "0.1.42";
-        edition = "2018";
-        sha256 = "0gd13pqgw5m6l4bqwjkickq13c4v0jxzxs5i4dwmldrlgvklafld";
-        procMacro = true;
-        authors = [
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2";
-          }
-          {
-            name = "quote";
-            packageId = "quote";
-          }
-          {
-            name = "syn";
-            packageId = "syn";
-            features = [ "full" "visit-mut" ];
-          }
-        ];
-        
-      };
-      "atty" = rec {
-        crateName = "atty";
-        version = "0.2.14";
-        edition = "2015";
-        sha256 = "1s7yslcs6a28c5vz7jwj63lkfgyx8mx99fdirlhi9lbhhzhrpcyr";
-        authors = [
-          "softprops <d.tangren@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "hermit-abi";
-            packageId = "hermit-abi";
-            target = { target, features }: (target."os" == "hermit");
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-            usesDefaultFeatures = false;
-            target = { target, features }: target."unix";
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "consoleapi" "processenv" "minwinbase" "minwindef" "winbase" ];
-          }
-        ];
-        
-      };
-      "autocfg" = rec {
-        crateName = "autocfg";
-        version = "1.0.1";
-        edition = "2015";
-        sha256 = "0jj6i9zn4gjl03kjvziqdji6rwx8ykz8zk2ngpc331z2g3fk3c6d";
-        authors = [
-          "Josh Stone <cuviper@gmail.com>"
-        ];
-        
-      };
-      "bitflags" = rec {
-        crateName = "bitflags";
-        version = "1.2.1";
-        edition = "2015";
-        sha256 = "14qnd5nq8p2almk79m4m8ydqhd413yaxsyjp5xd19g3mikzf47fg";
-        authors = [
-          "The Rust Project Developers"
-        ];
-        features = {
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "bytes" = rec {
-        crateName = "bytes";
-        version = "0.6.0";
-        edition = "2018";
-        sha256 = "05ivrcbgl4f7z2zzm9hbsi8cy66spi70xlm6fp16zsq4ylsvrp70";
-        authors = [
-          "Carl Lerche <me@carllerche.com>"
-          "Sean McArthur <sean@seanmonstar.com>"
-        ];
-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
-      };
-      "cfg-if 0.1.10" = rec {
-        crateName = "cfg-if";
-        version = "0.1.10";
-        edition = "2018";
-        sha256 = "08h80ihs74jcyp24cd75wwabygbbdgl05k6p5dmq8akbr78vv1a7";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        features = {
-          "rustc-dep-of-std" = [ "core" "compiler_builtins" ];
-        };
-      };
-      "cfg-if 1.0.0" = rec {
-        crateName = "cfg-if";
-        version = "1.0.0";
-        edition = "2018";
-        sha256 = "1za0vb97n4brpzpv8lsbnzmq5r8f2b0cpqqr0sy8h5bn751xxwds";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        features = {
-          "rustc-dep-of-std" = [ "core" "compiler_builtins" ];
-        };
-      };
-      "clap" = rec {
-        crateName = "clap";
-        version = "2.33.3";
-        edition = "2015";
-        sha256 = "00i065a58987k1sbzqmlz721rw521zcg08jmsh40gi3khp3qmr9p";
-        authors = [
-          "Kevin K. <kbknapp@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "ansi_term";
-            packageId = "ansi_term";
-            optional = true;
-            target = { target, features }: (!target."windows");
-          }
-          {
-            name = "atty";
-            packageId = "atty";
-            optional = true;
-          }
-          {
-            name = "bitflags";
-            packageId = "bitflags";
-          }
-          {
-            name = "strsim";
-            packageId = "strsim";
-            optional = true;
-          }
-          {
-            name = "textwrap";
-            packageId = "textwrap";
-          }
-          {
-            name = "unicode-width";
-            packageId = "unicode-width";
-          }
-          {
-            name = "vec_map";
-            packageId = "vec_map";
-            optional = true;
-          }
-        ];
-        features = {
-          "color" = [ "ansi_term" "atty" ];
-          "default" = [ "suggestions" "color" "vec_map" ];
-          "doc" = [ "yaml" ];
-          "lints" = [ "clippy" ];
-          "suggestions" = [ "strsim" ];
-          "wrap_help" = [ "term_size" "textwrap/term_size" ];
-          "yaml" = [ "yaml-rust" ];
-        };
-        resolvedDefaultFeatures = [ "ansi_term" "atty" "color" "default" "strsim" "suggestions" "vec_map" ];
-      };
-      "colmena" = rec {
-        crateName = "colmena";
-        version = "0.1.0";
-        edition = "2018";
-        crateBin = [
-          { name = "colmena"; path = "src/main.rs"; }
-        ];
-        src = lib.cleanSourceWith { filter = sourceFilter;  src = ./.; };
-        authors = [
-          "Zhaofeng Li <hello@zhaofeng.li>"
-        ];
-        dependencies = [
-          {
-            name = "async-trait";
-            packageId = "async-trait";
-          }
-          {
-            name = "clap";
-            packageId = "clap";
-          }
-          {
-            name = "console";
-            packageId = "console";
-          }
-          {
-            name = "futures";
-            packageId = "futures";
-          }
-          {
-            name = "glob";
-            packageId = "glob";
-          }
-          {
-            name = "indicatif";
-            packageId = "indicatif";
-          }
-          {
-            name = "log";
-            packageId = "log";
-          }
-          {
-            name = "serde";
-            packageId = "serde";
-            features = [ "derive" ];
-          }
-          {
-            name = "serde_json";
-            packageId = "serde_json";
-          }
-          {
-            name = "snafu";
-            packageId = "snafu";
-          }
-          {
-            name = "tempfile";
-            packageId = "tempfile";
-          }
-          {
-            name = "tokio";
-            packageId = "tokio";
-            features = [ "full" ];
-          }
-        ];
-        
-      };
-      "console" = rec {
-        crateName = "console";
-        version = "0.13.0";
-        edition = "2018";
-        sha256 = "022ai0jbbawngrx396qppwgzk4pk3v2fdwckzamvz6h154jsn2m5";
-        authors = [
-          "Armin Ronacher <armin.ronacher@active-4.com>"
-        ];
-        dependencies = [
-          {
-            name = "encode_unicode";
-            packageId = "encode_unicode";
-            target = { target, features }: target."windows";
-          }
-          {
-            name = "lazy_static";
-            packageId = "lazy_static";
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-          }
-          {
-            name = "regex";
-            packageId = "regex";
-            optional = true;
-            usesDefaultFeatures = false;
-            features = [ "std" ];
-          }
-          {
-            name = "terminal_size";
-            packageId = "terminal_size";
-          }
-          {
-            name = "unicode-width";
-            packageId = "unicode-width";
-            optional = true;
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "winbase" "winuser" "consoleapi" "processenv" "wincon" ];
-          }
-          {
-            name = "winapi-util";
-            packageId = "winapi-util";
-            optional = true;
-            target = { target, features }: target."windows";
-          }
-        ];
-        features = {
-          "ansi-parsing" = [ "regex" ];
-          "default" = [ "unicode-width" "ansi-parsing" "windows-console-colors" ];
-          "windows-console-colors" = [ "ansi-parsing" "winapi-util" ];
-        };
-        resolvedDefaultFeatures = [ "ansi-parsing" "default" "regex" "unicode-width" "winapi-util" "windows-console-colors" ];
-      };
-      "doc-comment" = rec {
-        crateName = "doc-comment";
-        version = "0.3.3";
-        edition = "2015";
-        sha256 = "043sprsf3wl926zmck1bm7gw0jq50mb76lkpk49vasfr6ax1p97y";
-        libName = "doc_comment";
-        authors = [
-          "Guillaume Gomez <guillaume1.gomez@gmail.com>"
-        ];
-        features = {
-        };
-      };
-      "encode_unicode" = rec {
-        crateName = "encode_unicode";
-        version = "0.3.6";
-        edition = "2015";
-        sha256 = "07w3vzrhxh9lpjgsg2y5bwzfar2aq35mdznvcp3zjl0ssj7d4mx3";
-        authors = [
-          "Torbjørn Birch Moltu <t.b.moltu@lyse.net>"
-        ];
-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
-      };
-      "futures" = rec {
-        crateName = "futures";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "1l434mh7p5na5c3c7lih575hszqc515r9idk62fm5rhz1820qfwv";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "futures-channel";
-            packageId = "futures-channel";
-            usesDefaultFeatures = false;
-            features = [ "sink" ];
-          }
-          {
-            name = "futures-core";
-            packageId = "futures-core";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-executor";
-            packageId = "futures-executor";
-            optional = true;
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-io";
-            packageId = "futures-io";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-sink";
-            packageId = "futures-sink";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-task";
-            packageId = "futures-task";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-util";
-            packageId = "futures-util";
-            usesDefaultFeatures = false;
-            features = [ "sink" ];
-          }
-        ];
-        features = {
-          "alloc" = [ "futures-core/alloc" "futures-task/alloc" "futures-sink/alloc" "futures-channel/alloc" "futures-util/alloc" ];
-          "async-await" = [ "futures-util/async-await" "futures-util/async-await-macro" ];
-          "bilock" = [ "futures-util/bilock" ];
-          "cfg-target-has-atomic" = [ "futures-core/cfg-target-has-atomic" "futures-task/cfg-target-has-atomic" "futures-channel/cfg-target-has-atomic" "futures-util/cfg-target-has-atomic" ];
-          "compat" = [ "std" "futures-util/compat" ];
-          "default" = [ "std" "async-await" "executor" ];
-          "executor" = [ "std" "futures-executor/std" ];
-          "io-compat" = [ "compat" "futures-util/io-compat" ];
-          "read-initializer" = [ "futures-io/read-initializer" "futures-util/read-initializer" ];
-          "std" = [ "alloc" "futures-core/std" "futures-task/std" "futures-io/std" "futures-sink/std" "futures-util/std" "futures-util/io" "futures-util/channel" ];
-          "thread-pool" = [ "executor" "futures-executor/thread-pool" ];
-          "unstable" = [ "futures-core/unstable" "futures-task/unstable" "futures-channel/unstable" "futures-io/unstable" "futures-util/unstable" ];
-          "write-all-vectored" = [ "futures-util/write-all-vectored" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "async-await" "default" "executor" "futures-executor" "std" ];
-      };
-      "futures-channel" = rec {
-        crateName = "futures-channel";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "0r7y228kkhwx9jj3ny5ppmw2gvw0capm6ig8dzppgqd4g9l0jwab";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "futures-core";
-            packageId = "futures-core";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-sink";
-            packageId = "futures-sink";
-            optional = true;
-            usesDefaultFeatures = false;
-          }
-        ];
-        features = {
-          "alloc" = [ "futures-core/alloc" ];
-          "cfg-target-has-atomic" = [ "futures-core/cfg-target-has-atomic" ];
-          "default" = [ "std" ];
-          "sink" = [ "futures-sink" ];
-          "std" = [ "alloc" "futures-core/std" ];
-          "unstable" = [ "futures-core/unstable" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "futures-sink" "sink" "std" ];
-      };
-      "futures-core" = rec {
-        crateName = "futures-core";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "0j0pixxv8dmqas1h5cgy92z4r9lpmnlis8ls22v17yrgnwqy2z44";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        features = {
-          "default" = [ "std" ];
-          "std" = [ "alloc" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "default" "std" ];
-      };
-      "futures-executor" = rec {
-        crateName = "futures-executor";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "0r8ayj6g08d1i0hj2v6g5zr3hzlkxpqlkpf1awq0105qd0mjpajc";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "futures-core";
-            packageId = "futures-core";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-task";
-            packageId = "futures-task";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-util";
-            packageId = "futures-util";
-            usesDefaultFeatures = false;
-          }
-        ];
-        features = {
-          "default" = [ "std" ];
-          "std" = [ "futures-core/std" "futures-task/std" "futures-util/std" ];
-          "thread-pool" = [ "std" "num_cpus" ];
-        };
-        resolvedDefaultFeatures = [ "std" ];
-      };
-      "futures-io" = rec {
-        crateName = "futures-io";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "1frh7d0n96lczy22al3bkgwpq0p1agbgax5kqh9vv8da33738631";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "std" ];
-      };
-      "futures-macro" = rec {
-        crateName = "futures-macro";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "0mjmb46zapb59iilsbljpj7l0hq6w19df0f03p3br5qz5xlqlh3p";
-        procMacro = true;
-        authors = [
-          "Taylor Cramer <cramertj@google.com>"
-          "Taiki Endo <te316e89@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "proc-macro-hack";
-            packageId = "proc-macro-hack";
-          }
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2";
-          }
-          {
-            name = "quote";
-            packageId = "quote";
-          }
-          {
-            name = "syn";
-            packageId = "syn";
-            features = [ "full" ];
-          }
-        ];
-        
-      };
-      "futures-sink" = rec {
-        crateName = "futures-sink";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "0gfb1z97q861ki6lqsvpgfn3hnm9w3vkrf82dc00xrff95d1jy7q";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        features = {
-          "default" = [ "std" ];
-          "std" = [ "alloc" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "std" ];
-      };
-      "futures-task" = rec {
-        crateName = "futures-task";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "03ad39v8scy353src2f9dkkvcs24n736iavi8xn45cj8pyslwmbw";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "once_cell";
-            packageId = "once_cell";
-            optional = true;
-            usesDefaultFeatures = false;
-            features = [ "std" ];
-          }
-        ];
-        features = {
-          "default" = [ "std" ];
-          "std" = [ "alloc" "once_cell" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "once_cell" "std" ];
-      };
-      "futures-util" = rec {
-        crateName = "futures-util";
-        version = "0.3.8";
-        edition = "2018";
-        sha256 = "1lnbhpyrypn9giw6122af0pffxfijfz3zm7phrwzp75rlzscy16k";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "futures-channel";
-            packageId = "futures-channel";
-            optional = true;
-            usesDefaultFeatures = false;
-            features = [ "std" ];
-          }
-          {
-            name = "futures-core";
-            packageId = "futures-core";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-io";
-            packageId = "futures-io";
-            optional = true;
-            usesDefaultFeatures = false;
-            features = [ "std" ];
-          }
-          {
-            name = "futures-macro";
-            packageId = "futures-macro";
-            optional = true;
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-sink";
-            packageId = "futures-sink";
-            optional = true;
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "futures-task";
-            packageId = "futures-task";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "memchr";
-            packageId = "memchr";
-            optional = true;
-          }
-          {
-            name = "pin-project";
-            packageId = "pin-project";
-          }
-          {
-            name = "pin-utils";
-            packageId = "pin-utils";
-          }
-          {
-            name = "proc-macro-hack";
-            packageId = "proc-macro-hack";
-            optional = true;
-          }
-          {
-            name = "proc-macro-nested";
-            packageId = "proc-macro-nested";
-            optional = true;
-          }
-          {
-            name = "slab";
-            packageId = "slab";
-            optional = true;
-          }
-        ];
-        features = {
-          "alloc" = [ "futures-core/alloc" "futures-task/alloc" ];
-          "async-await-macro" = [ "async-await" "futures-macro" "proc-macro-hack" "proc-macro-nested" ];
-          "cfg-target-has-atomic" = [ "futures-core/cfg-target-has-atomic" "futures-task/cfg-target-has-atomic" ];
-          "channel" = [ "std" "futures-channel" ];
-          "compat" = [ "std" "futures_01" ];
-          "default" = [ "std" "async-await" "async-await-macro" ];
-          "io" = [ "std" "futures-io" "memchr" ];
-          "io-compat" = [ "io" "compat" "tokio-io" ];
-          "read-initializer" = [ "io" "futures-io/read-initializer" "futures-io/unstable" ];
-          "sink" = [ "futures-sink" ];
-          "std" = [ "alloc" "futures-core/std" "futures-task/std" "slab" ];
-          "unstable" = [ "futures-core/unstable" "futures-task/unstable" ];
-          "write-all-vectored" = [ "io" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "async-await" "async-await-macro" "channel" "futures-channel" "futures-io" "futures-macro" "futures-sink" "io" "memchr" "proc-macro-hack" "proc-macro-nested" "sink" "slab" "std" ];
-      };
-      "getrandom" = rec {
-        crateName = "getrandom";
-        version = "0.1.15";
-        edition = "2018";
-        sha256 = "1rj7psnlrnmsgyj6x2ag4c6367laq4g8kfd6pzamac99xk07nn7w";
-        authors = [
-          "The Rand Project Developers"
-        ];
-        dependencies = [
-          {
-            name = "cfg-if";
-            packageId = "cfg-if 0.1.10";
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-            usesDefaultFeatures = false;
-            target = { target, features }: target."unix";
-          }
-          {
-            name = "wasi";
-            packageId = "wasi";
-            target = { target, features }: (target."os" == "wasi");
-          }
-        ];
-        features = {
-          "rustc-dep-of-std" = [ "compiler_builtins" "core" ];
-          "test-in-browser" = [ "wasm-bindgen" ];
-        };
-        resolvedDefaultFeatures = [ "std" ];
-      };
-      "glob" = rec {
-        crateName = "glob";
-        version = "0.3.0";
-        edition = "2015";
-        sha256 = "0x25wfr7vg3mzxc9x05dcphvd3nwlcmbnxrvwcvrrdwplcrrk4cv";
-        authors = [
-          "The Rust Project Developers"
-        ];
-        
-      };
-      "hermit-abi" = rec {
-        crateName = "hermit-abi";
-        version = "0.1.17";
-        edition = "2018";
-        sha256 = "1s1ss7xypnbpjglmj5k39svzsmni1rqp57a91qi5pyv0yxjmbjjs";
-        authors = [
-          "Stefan Lankes"
-        ];
-        dependencies = [
-          {
-            name = "libc";
-            packageId = "libc";
-            usesDefaultFeatures = false;
-          }
-        ];
-        features = {
-          "rustc-dep-of-std" = [ "core" "compiler_builtins/rustc-dep-of-std" "libc/rustc-dep-of-std" ];
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "indicatif" = rec {
-        crateName = "indicatif";
-        version = "0.15.0";
-        edition = "2018";
-        sha256 = "1r4n50mclyi4c7b9c9mlma1rhchjamw71r3z8vgqcmp24mhvbakv";
-        authors = [
-          "Armin Ronacher <armin.ronacher@active-4.com>"
-        ];
-        dependencies = [
-          {
-            name = "console";
-            packageId = "console";
-          }
-          {
-            name = "lazy_static";
-            packageId = "lazy_static";
-          }
-          {
-            name = "number_prefix";
-            packageId = "number_prefix";
-          }
-          {
-            name = "regex";
-            packageId = "regex";
-            usesDefaultFeatures = false;
-            features = [ "std" ];
-          }
-        ];
-        features = {
-          "improved_unicode" = [ "unicode-segmentation" "unicode-width" "console/unicode-width" ];
-          "with_rayon" = [ "rayon" ];
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "instant" = rec {
-        crateName = "instant";
-        version = "0.1.9";
-        edition = "2018";
-        sha256 = "1v659qqm55misvjijfbl1p7azjp4yynjbwldan8836ynpgp4w4k1";
-        authors = [
-          "sebcrozet <developer@crozet.re>"
-        ];
-        dependencies = [
-          {
-            name = "cfg-if";
-            packageId = "cfg-if 1.0.0";
-          }
-        ];
-        features = {
-          "now" = [ "time" ];
-          "wasm-bindgen" = [ "js-sys" "wasm-bindgen_rs" "web-sys" ];
-        };
-      };
-      "itoa" = rec {
-        crateName = "itoa";
-        version = "0.4.6";
-        edition = "2015";
-        sha256 = "1rnpb7rr8df76gnlk07b9086cn7fc0dxxy1ghh00q6nip7bklvyw";
-        authors = [
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        features = {
-          "default" = [ "std" ];
-        };
-      };
-      "lazy_static" = rec {
-        crateName = "lazy_static";
-        version = "1.4.0";
-        edition = "2015";
-        sha256 = "0in6ikhw8mgl33wjv6q6xfrb5b9jr16q8ygjy803fay4zcisvaz2";
-        authors = [
-          "Marvin Löbel <loebel.marvin@gmail.com>"
-        ];
-        features = {
-          "spin_no_std" = [ "spin" ];
-        };
-      };
-      "libc" = rec {
-        crateName = "libc";
-        version = "0.2.81";
-        edition = "2015";
-        sha256 = "1jsk82v5snd286ba92lir5snrxl18qm3kjkagz8c97hn0q9q50hl";
-        authors = [
-          "The Rust Project Developers"
-        ];
-        features = {
-          "default" = [ "std" ];
-          "rustc-dep-of-std" = [ "align" "rustc-std-workspace-core" ];
-          "use_std" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "align" "default" "std" ];
-      };
-      "lock_api" = rec {
-        crateName = "lock_api";
-        version = "0.4.2";
-        edition = "2018";
-        sha256 = "04hkhfq308agxg9wwmzh7ncfiyyyhn0d49n07abppzdj6p8zz5nx";
-        authors = [
-          "Amanieu d'Antras <amanieu@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "scopeguard";
-            packageId = "scopeguard";
-            usesDefaultFeatures = false;
-          }
-        ];
-        features = {
-        };
-      };
-      "log" = rec {
-        crateName = "log";
-        version = "0.4.11";
-        edition = "2015";
-        sha256 = "12xzqaflpiljn5cmxsbnbv9sjaj13ykhwsvll0gysbx4blbyvasg";
-        authors = [
-          "The Rust Project Developers"
-        ];
-        dependencies = [
-          {
-            name = "cfg-if";
-            packageId = "cfg-if 0.1.10";
-          }
-        ];
-        features = {
-          "kv_unstable_sval" = [ "kv_unstable" "sval/fmt" ];
-        };
-      };
-      "memchr" = rec {
-        crateName = "memchr";
-        version = "2.3.4";
-        edition = "2015";
-        sha256 = "098m9clfs495illlw00hv2gg67mhm7jflld3msyclvi5m9xc9q8f";
-        authors = [
-          "Andrew Gallant <jamslam@gmail.com>"
-          "bluss"
-        ];
-        features = {
-          "default" = [ "std" ];
-          "use_std" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
-      };
-      "mio" = rec {
-        crateName = "mio";
-        version = "0.7.6";
-        edition = "2018";
-        sha256 = "12qsvmsmpijnghgci5i0liskvwxrbg2dz6hc09kgvwaf0s3whfzk";
-        authors = [
-          "Carl Lerche <me@carllerche.com>"
-        ];
-        dependencies = [
-          {
-            name = "libc";
-            packageId = "libc";
-            target = { target, features }: target."unix";
-          }
-          {
-            name = "log";
-            packageId = "log";
-          }
-          {
-            name = "miow";
-            packageId = "miow";
-            target = { target, features }: target."windows";
-          }
-          {
-            name = "ntapi";
-            packageId = "ntapi";
-            target = { target, features }: target."windows";
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "winsock2" "mswsock" ];
-          }
-        ];
-        features = {
-          "os-ext" = [ "os-poll" ];
-          "os-util" = [ "os-ext" ];
-          "pipe" = [ "os-ext" ];
-          "tcp" = [ "net" ];
-          "udp" = [ "net" ];
-          "uds" = [ "net" ];
-        };
-        resolvedDefaultFeatures = [ "default" "net" "os-ext" "os-poll" "os-util" "tcp" "udp" "uds" ];
-      };
-      "miow" = rec {
-        crateName = "miow";
-        version = "0.3.6";
-        edition = "2018";
-        sha256 = "15sqdhh29dqgw5xh59clwv6scbsbvdkbmdc16hbfvyq7b2sw2css";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "socket2";
-            packageId = "socket2";
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            features = [ "std" "fileapi" "handleapi" "ioapiset" "minwindef" "namedpipeapi" "ntdef" "synchapi" "winerror" "winsock2" "ws2def" "ws2ipdef" ];
-          }
-        ];
-        
-      };
-      "ntapi" = rec {
-        crateName = "ntapi";
-        version = "0.3.6";
-        edition = "2018";
-        sha256 = "0i5daj9sr8wyi5jkpwpybln2jqpn59z0mqfc0dpdidipwh1bjsrz";
-        authors = [
-          "MSxDOS <melcodos@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "winapi";
-            packageId = "winapi";
-            features = [ "cfg" "evntrace" "in6addr" "inaddr" "minwinbase" "ntsecapi" "windef" "winioctl" ];
-          }
-        ];
-        features = {
-          "default" = [ "user" ];
-          "impl-default" = [ "winapi/impl-default" ];
-        };
-        resolvedDefaultFeatures = [ "default" "user" ];
-      };
-      "num_cpus" = rec {
-        crateName = "num_cpus";
-        version = "1.13.0";
-        edition = "2015";
-        sha256 = "1cv6yxhz2zbnwn8pn1yn8grg7zsnd523947fby41a737aqvryj85";
-        authors = [
-          "Sean McArthur <sean@seanmonstar.com>"
-        ];
-        dependencies = [
-          {
-            name = "hermit-abi";
-            packageId = "hermit-abi";
-            target = { target, features }: (((target."arch" == "x86_64") || (target."arch" == "aarch64")) && (target."os" == "hermit"));
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-          }
-        ];
-        
-      };
-      "number_prefix" = rec {
-        crateName = "number_prefix";
-        version = "0.3.0";
-        edition = "2015";
-        sha256 = "0slm4mqmpgs6hvz22ycny9lvyvl9ivs80a1lncslp7lszz02zc0p";
-        authors = [
-          "Benjamin Sago <ogham@bsago.me>"
-        ];
-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
-      };
-      "once_cell" = rec {
-        crateName = "once_cell";
-        version = "1.5.2";
-        edition = "2018";
-        sha256 = "183zs1dbmsv24mkafjypf9qwjrx46an58vb004a162l113sl3g8k";
-        authors = [
-          "Aleksey Kladov <aleksey.kladov@gmail.com>"
-        ];
-        features = {
-          "default" = [ "std" ];
-          "std" = [ "alloc" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "default" "std" ];
-      };
-      "parking_lot" = rec {
-        crateName = "parking_lot";
-        version = "0.11.1";
-        edition = "2018";
-        sha256 = "1sqmgaia8zfd5fbnqw2w13ijh7crk3lf9vw4cb52vwlx0an48xvd";
-        authors = [
-          "Amanieu d'Antras <amanieu@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "instant";
-            packageId = "instant";
-          }
-          {
-            name = "lock_api";
-            packageId = "lock_api";
-          }
-          {
-            name = "parking_lot_core";
-            packageId = "parking_lot_core";
-          }
-        ];
-        features = {
-          "deadlock_detection" = [ "parking_lot_core/deadlock_detection" ];
-          "nightly" = [ "parking_lot_core/nightly" "lock_api/nightly" ];
-          "owning_ref" = [ "lock_api/owning_ref" ];
-          "serde" = [ "lock_api/serde" ];
-          "stdweb" = [ "instant/stdweb" ];
-          "wasm-bindgen" = [ "instant/wasm-bindgen" ];
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "parking_lot_core" = rec {
-        crateName = "parking_lot_core";
-        version = "0.8.1";
-        edition = "2018";
-        sha256 = "1l6fhxks1xc8vbcwlz2119canmaql5hfhny51552hibl8awdkinp";
-        authors = [
-          "Amanieu d'Antras <amanieu@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "cfg-if";
-            packageId = "cfg-if 1.0.0";
-          }
-          {
-            name = "instant";
-            packageId = "instant";
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-            target = { target, features }: target."unix";
-          }
-          {
-            name = "redox_syscall";
-            packageId = "redox_syscall";
-            target = { target, features }: (target."os" == "redox");
-          }
-          {
-            name = "smallvec";
-            packageId = "smallvec";
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "winnt" "ntstatus" "minwindef" "winerror" "winbase" "errhandlingapi" "handleapi" ];
-          }
-        ];
-        features = {
-          "deadlock_detection" = [ "petgraph" "thread-id" "backtrace" ];
-        };
-      };
-      "pin-project" = rec {
-        crateName = "pin-project";
-        version = "1.0.2";
-        edition = "2018";
-        sha256 = "19qw2nm2kk38v9j16nsm8j3fkh0g8pjq0k4cplx7i2f4q8vj5k4w";
-        authors = [
-          "Taiki Endo <te316e89@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "pin-project-internal";
-            packageId = "pin-project-internal";
-            usesDefaultFeatures = false;
-          }
-        ];
-        
-      };
-      "pin-project-internal" = rec {
-        crateName = "pin-project-internal";
-        version = "1.0.2";
-        edition = "2018";
-        sha256 = "0pwy3m32scf3ypjb9ai151lmaa27vyj06lc64i28l0r31fzx5s7q";
-        procMacro = true;
-        authors = [
-          "Taiki Endo <te316e89@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2";
-          }
-          {
-            name = "quote";
-            packageId = "quote";
-          }
-          {
-            name = "syn";
-            packageId = "syn";
-            features = [ "full" "visit-mut" ];
-          }
-        ];
-        
-      };
-      "pin-project-lite" = rec {
-        crateName = "pin-project-lite";
-        version = "0.2.0";
-        edition = "2018";
-        sha256 = "070klqy200alrhxb79fxarrrrn0vbwg95dmqw9062vhqxibky1kb";
-        authors = [
-          "Taiki Endo <te316e89@gmail.com>"
-        ];
-        
-      };
-      "pin-utils" = rec {
-        crateName = "pin-utils";
-        version = "0.1.0";
-        edition = "2018";
-        sha256 = "117ir7vslsl2z1a7qzhws4pd01cg2d3338c47swjyvqv2n60v1wb";
-        authors = [
-          "Josef Brandl <mail@josefbrandl.de>"
-        ];
-        
-      };
-      "ppv-lite86" = rec {
-        crateName = "ppv-lite86";
-        version = "0.2.10";
-        edition = "2018";
-        sha256 = "0ms8198kclg4h96ggbziixxmsdl847s648kmbx11zlmjsqjccx5c";
-        authors = [
-          "The CryptoCorrosion Contributors"
-        ];
-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "simd" "std" ];
-      };
-      "proc-macro-hack" = rec {
-        crateName = "proc-macro-hack";
-        version = "0.5.19";
-        edition = "2018";
-        sha256 = "1rg0kzsj7lj00qj602d3h77spwfz48vixn1wbjp7a4yrq65w9w6v";
-        procMacro = true;
-        authors = [
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        
-      };
-      "proc-macro-nested" = rec {
-        crateName = "proc-macro-nested";
-        version = "0.1.6";
-        edition = "2015";
-        sha256 = "0nnwm9bvp1fmr8nqjp8ynrkj97yzpsdh3062li8b0f4hzgd818gb";
-        authors = [
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        
-      };
-      "proc-macro2" = rec {
-        crateName = "proc-macro2";
-        version = "1.0.24";
-        edition = "2018";
-        sha256 = "0wcabxzrddcjmryndw8fpyxcq6rw63m701vx86xxf03y3bp081qy";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "unicode-xid";
-            packageId = "unicode-xid";
-          }
-        ];
-        features = {
-          "default" = [ "proc-macro" ];
-        };
-        resolvedDefaultFeatures = [ "default" "proc-macro" ];
-      };
-      "quote" = rec {
-        crateName = "quote";
-        version = "1.0.7";
-        edition = "2018";
-        sha256 = "0drzd6pq7whq7qhdvvs8wn6pbb0hhc12pz8wv80fb05ixhbksmma";
-        authors = [
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2";
-            usesDefaultFeatures = false;
-          }
-        ];
-        features = {
-          "default" = [ "proc-macro" ];
-          "proc-macro" = [ "proc-macro2/proc-macro" ];
-        };
-        resolvedDefaultFeatures = [ "default" "proc-macro" ];
-      };
-      "rand" = rec {
-        crateName = "rand";
-        version = "0.7.3";
-        edition = "2018";
-        sha256 = "00sdaimkbz491qgi6qxkv582yivl32m2jd401kzbn94vsiwicsva";
-        authors = [
-          "The Rand Project Developers"
-          "The Rust Project Developers"
-        ];
-        dependencies = [
-          {
-            name = "getrandom";
-            packageId = "getrandom";
-            rename = "getrandom_package";
-            optional = true;
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-            optional = true;
-            usesDefaultFeatures = false;
-            target = { target, features }: target."unix";
-          }
-          {
-            name = "rand_chacha";
-            packageId = "rand_chacha";
-            usesDefaultFeatures = false;
-            target = { target, features }: (!(target."os" == "emscripten"));
-          }
-          {
-            name = "rand_core";
-            packageId = "rand_core";
-          }
-          {
-            name = "rand_hc";
-            packageId = "rand_hc";
-            target = { target, features }: (target."os" == "emscripten");
-          }
-        ];
-        devDependencies = [
-          {
-            name = "rand_hc";
-            packageId = "rand_hc";
-          }
-        ];
-        features = {
-          "alloc" = [ "rand_core/alloc" ];
-          "default" = [ "std" ];
-          "getrandom" = [ "getrandom_package" "rand_core/getrandom" ];
-          "nightly" = [ "simd_support" ];
-          "simd_support" = [ "packed_simd" ];
-          "small_rng" = [ "rand_pcg" ];
-          "std" = [ "rand_core/std" "rand_chacha/std" "alloc" "getrandom" "libc" ];
-          "stdweb" = [ "getrandom_package/stdweb" ];
-          "wasm-bindgen" = [ "getrandom_package/wasm-bindgen" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "default" "getrandom" "getrandom_package" "libc" "std" ];
-      };
-      "rand_chacha" = rec {
-        crateName = "rand_chacha";
-        version = "0.2.2";
-        edition = "2018";
-        sha256 = "00il36fkdbsmpr99p9ksmmp6dn1md7rmnwmz0rr77jbrca2yvj7l";
-        authors = [
-          "The Rand Project Developers"
-          "The Rust Project Developers"
-          "The CryptoCorrosion Contributors"
-        ];
-        dependencies = [
-          {
-            name = "ppv-lite86";
-            packageId = "ppv-lite86";
-            usesDefaultFeatures = false;
-            features = [ "simd" ];
-          }
-          {
-            name = "rand_core";
-            packageId = "rand_core";
-          }
-        ];
-        features = {
-          "default" = [ "std" "simd" ];
-          "std" = [ "ppv-lite86/std" ];
-        };
-        resolvedDefaultFeatures = [ "std" ];
-      };
-      "rand_core" = rec {
-        crateName = "rand_core";
-        version = "0.5.1";
-        edition = "2018";
-        sha256 = "06bdvx08v3rkz451cm7z59xwwqn1rkfh6v9ay77b14f8dwlybgch";
-        authors = [
-          "The Rand Project Developers"
-          "The Rust Project Developers"
-        ];
-        dependencies = [
-          {
-            name = "getrandom";
-            packageId = "getrandom";
-            optional = true;
-          }
-        ];
-        features = {
-          "serde1" = [ "serde" ];
-          "std" = [ "alloc" "getrandom" "getrandom/std" ];
-        };
-        resolvedDefaultFeatures = [ "alloc" "getrandom" "std" ];
-      };
-      "rand_hc" = rec {
-        crateName = "rand_hc";
-        version = "0.2.0";
-        edition = "2018";
-        sha256 = "0g31sqwpmsirdlwr0svnacr4dbqyz339im4ssl9738cjgfpjjcfa";
-        authors = [
-          "The Rand Project Developers"
-        ];
-        dependencies = [
-          {
-            name = "rand_core";
-            packageId = "rand_core";
-          }
-        ];
-        
-      };
-      "redox_syscall" = rec {
-        crateName = "redox_syscall";
-        version = "0.1.57";
-        edition = "2015";
-        sha256 = "1kh59fpwy33w9nwd5iyc283yglq8pf2s41hnhvl48iax9mz0zk21";
-        libName = "syscall";
-        authors = [
-          "Jeremy Soller <jackpot51@gmail.com>"
-        ];
-        
-      };
-      "regex" = rec {
-        crateName = "regex";
-        version = "1.4.2";
-        edition = "2015";
-        sha256 = "172bw2yryv65whn3n5vkww4kgk0bq08lx0zbln8xwia7xl9jrkrq";
-        authors = [
-          "The Rust Project Developers"
-        ];
-        dependencies = [
-          {
-            name = "regex-syntax";
-            packageId = "regex-syntax";
-            usesDefaultFeatures = false;
-          }
-        ];
-        features = {
-          "default" = [ "std" "perf" "unicode" "regex-syntax/default" ];
-          "perf" = [ "perf-cache" "perf-dfa" "perf-inline" "perf-literal" ];
-          "perf-cache" = [ "thread_local" ];
-          "perf-literal" = [ "aho-corasick" "memchr" ];
-          "unicode" = [ "unicode-age" "unicode-bool" "unicode-case" "unicode-gencat" "unicode-perl" "unicode-script" "unicode-segment" "regex-syntax/unicode" ];
-          "unicode-age" = [ "regex-syntax/unicode-age" ];
-          "unicode-bool" = [ "regex-syntax/unicode-bool" ];
-          "unicode-case" = [ "regex-syntax/unicode-case" ];
-          "unicode-gencat" = [ "regex-syntax/unicode-gencat" ];
-          "unicode-perl" = [ "regex-syntax/unicode-perl" ];
-          "unicode-script" = [ "regex-syntax/unicode-script" ];
-          "unicode-segment" = [ "regex-syntax/unicode-segment" ];
-          "unstable" = [ "pattern" ];
-          "use_std" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "std" ];
-      };
-      "regex-syntax" = rec {
-        crateName = "regex-syntax";
-        version = "0.6.21";
-        edition = "2015";
-        sha256 = "12d176jkgw9749g07zjxz0n78nyvb2nqx3j4sp5aqyphvji1n61v";
-        authors = [
-          "The Rust Project Developers"
-        ];
-        features = {
-          "default" = [ "unicode" ];
-          "unicode" = [ "unicode-age" "unicode-bool" "unicode-case" "unicode-gencat" "unicode-perl" "unicode-script" "unicode-segment" ];
-        };
-      };
-      "remove_dir_all" = rec {
-        crateName = "remove_dir_all";
-        version = "0.5.3";
-        edition = "2015";
-        sha256 = "1rzqbsgkmr053bxxl04vmvsd1njyz0nxvly97aip6aa2cmb15k9s";
-        authors = [
-          "Aaronepower <theaaronepower@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "std" "errhandlingapi" "winerror" "fileapi" "winbase" ];
-          }
-        ];
-        
-      };
-      "ryu" = rec {
-        crateName = "ryu";
-        version = "1.0.5";
-        edition = "2018";
-        sha256 = "0vpqv1dj7fksa6hm3zpk5rbsjs0ifbfy7xwzsyyil0rx37a03lvi";
-        authors = [
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        features = {
-        };
-      };
-      "scopeguard" = rec {
-        crateName = "scopeguard";
-        version = "1.1.0";
-        edition = "2015";
-        sha256 = "1kbqm85v43rq92vx7hfiay6pmcga03vrjbbfwqpyj3pwsg3b16nj";
-        authors = [
-          "bluss"
-        ];
-        features = {
-          "default" = [ "use_std" ];
-        };
-      };
-      "serde" = rec {
-        crateName = "serde";
-        version = "1.0.118";
-        edition = "2015";
-        sha256 = "0028kv3dh3ix5g7jfws22zb9hcqq4cnpwn2lnlpam1wxhmil5ih6";
-        authors = [
-          "Erick Tryzelaar <erick.tryzelaar@gmail.com>"
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "serde_derive";
-            packageId = "serde_derive";
-            optional = true;
-          }
-        ];
-        devDependencies = [
-          {
-            name = "serde_derive";
-            packageId = "serde_derive";
-          }
-        ];
-        features = {
-          "default" = [ "std" ];
-          "derive" = [ "serde_derive" ];
-        };
-        resolvedDefaultFeatures = [ "default" "derive" "serde_derive" "std" ];
-      };
-      "serde_derive" = rec {
-        crateName = "serde_derive";
-        version = "1.0.118";
-        edition = "2015";
-        sha256 = "1pvj4v8k107ichsnm7jgm9kxyi2lf971x52bmxhm5mcwd4k3akf8";
-        procMacro = true;
-        authors = [
-          "Erick Tryzelaar <erick.tryzelaar@gmail.com>"
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2";
-          }
-          {
-            name = "quote";
-            packageId = "quote";
-          }
-          {
-            name = "syn";
-            packageId = "syn";
-            features = [ "visit" ];
-          }
-        ];
-        features = {
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "serde_json" = rec {
-        crateName = "serde_json";
-        version = "1.0.60";
-        edition = "2018";
-        sha256 = "0yapc7xxk8dx12691yj0l13008rgvknmc6krvk8jwj7y4x6yh00m";
-        authors = [
-          "Erick Tryzelaar <erick.tryzelaar@gmail.com>"
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "itoa";
-            packageId = "itoa";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "ryu";
-            packageId = "ryu";
-          }
-          {
-            name = "serde";
-            packageId = "serde";
-            usesDefaultFeatures = false;
-          }
-        ];
-        features = {
-          "alloc" = [ "serde/alloc" ];
-          "default" = [ "std" ];
-          "preserve_order" = [ "indexmap" ];
-          "std" = [ "serde/std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
-      };
-      "signal-hook-registry" = rec {
-        crateName = "signal-hook-registry";
-        version = "1.2.2";
-        edition = "2015";
-        sha256 = "1ar0dd9q1w952knhs0fx7qfh4iq5jvcvwkw1xg5fmmandh6flcnf";
-        authors = [
-          "Michal 'vorner' Vaner <vorner@vorner.cz>"
-          "Masaki Hara <ackie.h.gmai@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "libc";
-            packageId = "libc";
-          }
-        ];
-        
-      };
-      "slab" = rec {
-        crateName = "slab";
-        version = "0.4.2";
-        edition = "2015";
-        sha256 = "1y59xsa27jk84sxzswjk60xcjf8b4fm5960jwpznrrcmasyva4f1";
-        authors = [
-          "Carl Lerche <me@carllerche.com>"
-        ];
-        
-      };
-      "smallvec" = rec {
-        crateName = "smallvec";
-        version = "1.5.1";
-        edition = "2018";
-        sha256 = "0xcxvc2lh2fj02d91v4dx1l4q14m5rb4yac788bhwxvxdl2lylmf";
-        authors = [
-          "The Servo Project Developers"
-        ];
-        features = {
-        };
-      };
-      "snafu" = rec {
-        crateName = "snafu";
-        version = "0.6.10";
-        edition = "2018";
-        sha256 = "19wwqxwb85pl040qk5xylj0vlznib3xzy9hcv2q0h8qv4qy2vcga";
-        authors = [
-          "Jake Goulding <jake.goulding@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "doc-comment";
-            packageId = "doc-comment";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "snafu-derive";
-            packageId = "snafu-derive";
-          }
-        ];
-        features = {
-          "backtraces" = [ "std" "backtrace" ];
-          "backtraces-impl-backtrace-crate" = [ "backtraces" ];
-          "default" = [ "std" "guide" ];
-          "futures" = [ "futures-core-crate" "pin-project" ];
-          "futures-01" = [ "futures-01-crate" ];
-          "internal-dev-dependencies" = [ "futures-crate" ];
-          "unstable-backtraces-impl-std" = [ "backtraces" "snafu-derive/unstable-backtraces-impl-std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "guide" "std" ];
-      };
-      "snafu-derive" = rec {
-        crateName = "snafu-derive";
-        version = "0.6.10";
-        edition = "2018";
-        sha256 = "0nri7ma06g5kimpcdcm8359a55nmps5f3kcngy0j6bin7jhfy20m";
-        procMacro = true;
-        authors = [
-          "Jake Goulding <jake.goulding@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2";
-          }
-          {
-            name = "quote";
-            packageId = "quote";
-          }
-          {
-            name = "syn";
-            packageId = "syn";
-            features = [ "full" ];
-          }
-        ];
-        features = {
-        };
-      };
-      "socket2" = rec {
-        crateName = "socket2";
-        version = "0.3.17";
-        edition = "2018";
-        sha256 = "00k98q2ab98j9ffmmsh0wlwck2apy83a7v5bfy122apfpmx98a9c";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "cfg-if";
-            packageId = "cfg-if 1.0.0";
-            target = { target, features }: (target."unix" || (target."os" == "redox"));
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-            target = { target, features }: (target."unix" || (target."os" == "redox"));
-            features = [ "align" ];
-          }
-          {
-            name = "redox_syscall";
-            packageId = "redox_syscall";
-            target = { target, features }: (target."os" == "redox");
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "handleapi" "ws2def" "ws2ipdef" "ws2tcpip" "minwindef" ];
-          }
-        ];
-        features = {
-        };
-      };
-      "strsim" = rec {
-        crateName = "strsim";
-        version = "0.8.0";
-        edition = "2015";
-        sha256 = "0sjsm7hrvjdifz661pjxq5w4hf190hx53fra8dfvamacvff139cf";
-        authors = [
-          "Danny Guo <dannyguo91@gmail.com>"
-        ];
-        
-      };
-      "syn" = rec {
-        crateName = "syn";
-        version = "1.0.54";
-        edition = "2018";
-        sha256 = "0i3z22zvzzsmrsbhi0ivpmv71fgxkcywjnf3alid8srxlrbzjals";
-        authors = [
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "quote";
-            packageId = "quote";
-            optional = true;
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "unicode-xid";
-            packageId = "unicode-xid";
-          }
-        ];
-        features = {
-          "default" = [ "derive" "parsing" "printing" "clone-impls" "proc-macro" ];
-          "printing" = [ "quote" ];
-          "proc-macro" = [ "proc-macro2/proc-macro" "quote/proc-macro" ];
-          "test" = [ "syn-test-suite/all-features" ];
-        };
-        resolvedDefaultFeatures = [ "clone-impls" "default" "derive" "full" "parsing" "printing" "proc-macro" "quote" "visit" "visit-mut" ];
-      };
-      "tempfile" = rec {
-        crateName = "tempfile";
-        version = "3.1.0";
-        edition = "2018";
-        sha256 = "1a9cfdqw70n7bcnkx05aih9xdba8lqazmqlkjpkmn2la6gcj8vks";
-        authors = [
-          "Steven Allen <steven@stebalien.com>"
-          "The Rust Project Developers"
-          "Ashley Mannix <ashleymannix@live.com.au>"
-          "Jason White <jasonaw0@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "cfg-if";
-            packageId = "cfg-if 0.1.10";
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-            target = { target, features }: target."unix";
-          }
-          {
-            name = "rand";
-            packageId = "rand";
-          }
-          {
-            name = "redox_syscall";
-            packageId = "redox_syscall";
-            target = { target, features }: (target."os" == "redox");
-          }
-          {
-            name = "remove_dir_all";
-            packageId = "remove_dir_all";
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "fileapi" "handleapi" "winbase" ];
-          }
-        ];
-        
-      };
-      "terminal_size" = rec {
-        crateName = "terminal_size";
-        version = "0.1.15";
-        edition = "2018";
-        sha256 = "1qfb07d040wh3m4yfnbxknda7i5fr56ypnwdwdgmzb1zpn1x3ljb";
-        authors = [
-          "Andrew Chin <achin@eminence32.net>"
-        ];
-        dependencies = [
-          {
-            name = "libc";
-            packageId = "libc";
-            target = { target, features }: (!target."windows");
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "handleapi" "processenv" "winbase" "wincon" "winnt" ];
-          }
-        ];
-        
-      };
-      "textwrap" = rec {
-        crateName = "textwrap";
-        version = "0.11.0";
-        edition = "2015";
-        sha256 = "0q5hky03ik3y50s9sz25r438bc4nwhqc6dqwynv4wylc807n29nk";
-        authors = [
-          "Martin Geisler <martin@geisler.net>"
-        ];
-        dependencies = [
-          {
-            name = "unicode-width";
-            packageId = "unicode-width";
-          }
-        ];
-        
-      };
-      "tokio" = rec {
-        crateName = "tokio";
-        version = "0.3.6";
-        edition = "2018";
-        sha256 = "0z78l7kn4y2qvghsp9dyqgvr1kjvv63pjq3d8nzi31q74lfa42vj";
-        authors = [
-          "Tokio Contributors <team@tokio.rs>"
-        ];
-        dependencies = [
-          {
-            name = "bytes";
-            packageId = "bytes";
-            optional = true;
-          }
-          {
-            name = "futures-core";
-            packageId = "futures-core";
-            optional = true;
-          }
-          {
-            name = "libc";
-            packageId = "libc";
-            optional = true;
-            target = { target, features }: target."unix";
-          }
-          {
-            name = "memchr";
-            packageId = "memchr";
-            optional = true;
-          }
-          {
-            name = "mio";
-            packageId = "mio";
-            optional = true;
-          }
-          {
-            name = "num_cpus";
-            packageId = "num_cpus";
-            optional = true;
-          }
-          {
-            name = "once_cell";
-            packageId = "once_cell";
-            optional = true;
-          }
-          {
-            name = "parking_lot";
-            packageId = "parking_lot";
-            optional = true;
-          }
-          {
-            name = "pin-project-lite";
-            packageId = "pin-project-lite";
-          }
-          {
-            name = "signal-hook-registry";
-            packageId = "signal-hook-registry";
-            optional = true;
-            target = { target, features }: target."unix";
-          }
-          {
-            name = "slab";
-            packageId = "slab";
-            optional = true;
-          }
-          {
-            name = "tokio-macros";
-            packageId = "tokio-macros";
-            optional = true;
-          }
-          {
-            name = "winapi";
-            packageId = "winapi";
-            optional = true;
-            usesDefaultFeatures = false;
-            target = { target, features }: target."windows";
-          }
-        ];
-        buildDependencies = [
-          {
-            name = "autocfg";
-            packageId = "autocfg";
-          }
-        ];
-        devDependencies = [
-          {
-            name = "libc";
-            packageId = "libc";
-            target = {target, features}: target."unix";
-          }
-        ];
-        features = {
-          "full" = [ "fs" "io-util" "io-std" "macros" "net" "parking_lot" "process" "rt" "rt-multi-thread" "signal" "stream" "sync" "time" ];
-          "io-util" = [ "memchr" "bytes" ];
-          "macros" = [ "tokio-macros" ];
-          "net" = [ "libc" "mio/os-poll" "mio/os-util" "mio/tcp" "mio/udp" "mio/uds" ];
-          "process" = [ "bytes" "once_cell" "libc" "mio/os-poll" "mio/os-util" "mio/uds" "signal-hook-registry" "winapi/threadpoollegacyapiset" ];
-          "rt" = [ "slab" ];
-          "rt-multi-thread" = [ "num_cpus" "rt" ];
-          "signal" = [ "once_cell" "libc" "mio/os-poll" "mio/uds" "mio/os-util" "signal-hook-registry" "winapi/consoleapi" ];
-          "stream" = [ "futures-core" ];
-        };
-        resolvedDefaultFeatures = [ "bytes" "default" "fs" "full" "futures-core" "io-std" "io-util" "libc" "macros" "memchr" "mio" "net" "num_cpus" "once_cell" "parking_lot" "process" "rt" "rt-multi-thread" "signal" "signal-hook-registry" "slab" "stream" "sync" "time" "tokio-macros" "winapi" ];
-      };
-      "tokio-macros" = rec {
-        crateName = "tokio-macros";
-        version = "0.3.1";
-        edition = "2018";
-        sha256 = "0iaw1k9qcn3fjgl4qcqwl8if8jjdkldam4cn0j8qybfwnpdhzlr1";
-        procMacro = true;
-        authors = [
-          "Tokio Contributors <team@tokio.rs>"
-        ];
-        dependencies = [
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2";
-          }
-          {
-            name = "quote";
-            packageId = "quote";
-          }
-          {
-            name = "syn";
-            packageId = "syn";
-            features = [ "full" ];
-          }
-        ];
-        
-      };
-      "unicode-width" = rec {
-        crateName = "unicode-width";
-        version = "0.1.8";
-        edition = "2015";
-        sha256 = "1qxizyi6xbcqyi4z79p523ywvmgsfcgfqb3zv3c8i6x1jcc5jdwk";
-        authors = [
-          "kwantam <kwantam@gmail.com>"
-          "Manish Goregaokar <manishsmail@gmail.com>"
-        ];
-        features = {
-          "rustc-dep-of-std" = [ "std" "core" "compiler_builtins" ];
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "unicode-xid" = rec {
-        crateName = "unicode-xid";
-        version = "0.2.1";
-        edition = "2015";
-        sha256 = "0r6mknipyy9vpz8mwmxvkx65ff2ha1n2pxqjj6f46lcn8yrhpzpp";
-        authors = [
-          "erick.tryzelaar <erick.tryzelaar@gmail.com>"
-          "kwantam <kwantam@gmail.com>"
-        ];
-        features = {
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "vec_map" = rec {
-        crateName = "vec_map";
-        version = "0.8.2";
-        edition = "2015";
-        sha256 = "1481w9g1dw9rxp3l6snkdqihzyrd2f8vispzqmwjwsdyhw8xzggi";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-          "Jorge Aparicio <japaricious@gmail.com>"
-          "Alexis Beingessner <a.beingessner@gmail.com>"
-          "Brian Anderson <>"
-          "tbu- <>"
-          "Manish Goregaokar <>"
-          "Aaron Turon <aturon@mozilla.com>"
-          "Adolfo Ochagavía <>"
-          "Niko Matsakis <>"
-          "Steven Fackler <>"
-          "Chase Southwood <csouth3@illinois.edu>"
-          "Eduard Burtescu <>"
-          "Florian Wilkens <>"
-          "Félix Raimundo <>"
-          "Tibor Benke <>"
-          "Markus Siemens <markus@m-siemens.de>"
-          "Josh Branchaud <jbranchaud@gmail.com>"
-          "Huon Wilson <dbau.pp@gmail.com>"
-          "Corey Farwell <coref@rwell.org>"
-          "Aaron Liblong <>"
-          "Nick Cameron <nrc@ncameron.org>"
-          "Patrick Walton <pcwalton@mimiga.net>"
-          "Felix S Klock II <>"
-          "Andrew Paseltiner <apaseltiner@gmail.com>"
-          "Sean McArthur <sean.monstar@gmail.com>"
-          "Vadim Petrochenkov <>"
-        ];
-        features = {
-          "eders" = [ "serde" ];
-        };
-      };
-      "wasi" = rec {
-        crateName = "wasi";
-        version = "0.9.0+wasi-snapshot-preview1";
-        edition = "2018";
-        sha256 = "06g5v3vrdapfzvfq662cij7v8a1flwr2my45nnncdv2galrdzkfc";
-        authors = [
-          "The Cranelift Project Developers"
-        ];
-        features = {
-          "default" = [ "std" ];
-          "rustc-dep-of-std" = [ "compiler_builtins" "core" "rustc-std-workspace-alloc" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
-      };
-      "winapi" = rec {
-        crateName = "winapi";
-        version = "0.3.9";
-        edition = "2015";
-        sha256 = "06gl025x418lchw1wxj64ycr7gha83m44cjr5sarhynd9xkrm0sw";
-        authors = [
-          "Peter Atashian <retep998@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "winapi-i686-pc-windows-gnu";
-            packageId = "winapi-i686-pc-windows-gnu";
-            target = { target, features }: (stdenv.hostPlatform.config == "i686-pc-windows-gnu");
-          }
-          {
-            name = "winapi-x86_64-pc-windows-gnu";
-            packageId = "winapi-x86_64-pc-windows-gnu";
-            target = { target, features }: (stdenv.hostPlatform.config == "x86_64-pc-windows-gnu");
-          }
-        ];
-        features = {
-          "debug" = [ "impl-debug" ];
-        };
-        resolvedDefaultFeatures = [ "cfg" "consoleapi" "errhandlingapi" "evntrace" "fileapi" "handleapi" "in6addr" "inaddr" "ioapiset" "minwinbase" "minwindef" "mswsock" "namedpipeapi" "ntdef" "ntsecapi" "ntstatus" "processenv" "std" "synchapi" "threadpoollegacyapiset" "winbase" "wincon" "windef" "winerror" "winioctl" "winnt" "winsock2" "winuser" "ws2def" "ws2ipdef" "ws2tcpip" ];
-      };
-      "winapi-i686-pc-windows-gnu" = rec {
-        crateName = "winapi-i686-pc-windows-gnu";
-        version = "0.4.0";
-        edition = "2015";
-        sha256 = "1dmpa6mvcvzz16zg6d5vrfy4bxgg541wxrcip7cnshi06v38ffxc";
-        authors = [
-          "Peter Atashian <retep998@gmail.com>"
-        ];
-        
-      };
-      "winapi-util" = rec {
-        crateName = "winapi-util";
-        version = "0.1.5";
-        edition = "2018";
-        sha256 = "0y71bp7f6d536czj40dhqk0d55wfbbwqfp2ymqf1an5ibgl6rv3h";
-        authors = [
-          "Andrew Gallant <jamslam@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "winapi";
-            packageId = "winapi";
-            target = { target, features }: target."windows";
-            features = [ "std" "consoleapi" "errhandlingapi" "fileapi" "minwindef" "processenv" "winbase" "wincon" "winerror" "winnt" ];
-          }
-        ];
-        
-      };
-      "winapi-x86_64-pc-windows-gnu" = rec {
-        crateName = "winapi-x86_64-pc-windows-gnu";
-        version = "0.4.0";
-        edition = "2015";
-        sha256 = "0gqq64czqb64kskjryj8isp62m2sgvx25yyj3kpc2myh85w24bki";
-        authors = [
-          "Peter Atashian <retep998@gmail.com>"
-        ];
-        
-      };
-    };
-
-    #
-# crate2nix/default.nix (excerpt start)
-#
-
-  /* Target (platform) data for conditional dependencies.
-     This corresponds roughly to what buildRustCrate is setting.
-  */
-  defaultTarget = {
-    unix = true;
-    windows = false;
-    fuchsia = true;
-    test = false;
-
-    # This doesn't appear to be officially documented anywhere yet.
-    # See https://github.com/rust-lang-nursery/rust-forge/issues/101.
-    os =
-      if stdenv.hostPlatform.isDarwin
-      then "macos"
-      else stdenv.hostPlatform.parsed.kernel.name;
-    arch = stdenv.hostPlatform.parsed.cpu.name;
-    family = "unix";
-    env = "gnu";
-    endian =
-      if stdenv.hostPlatform.parsed.cpu.significantByte.name == "littleEndian"
-      then "little" else "big";
-    pointer_width = toString stdenv.hostPlatform.parsed.cpu.bits;
-    vendor = stdenv.hostPlatform.parsed.vendor.name;
-    debug_assertions = false;
-  };
-
-  /* Filters common temp files and build files. */
-  # TODO(pkolloch): Substitute with gitignore filter
-  sourceFilter = name: type:
-    let
-      baseName = builtins.baseNameOf (builtins.toString name);
-    in
-      ! (
-        # Filter out git
-        baseName == ".gitignore"
-        || (type == "directory" && baseName == ".git")
-
-        # Filter out build results
-        || (
-          type == "directory" && (
-            baseName == "target"
-            || baseName == "_site"
-            || baseName == ".sass-cache"
-            || baseName == ".jekyll-metadata"
-            || baseName == "build-artifacts"
-          )
-        )
-
-        # Filter out nix-build result symlinks
-        || (
-          type == "symlink" && lib.hasPrefix "result" baseName
-        )
-
-        # Filter out IDE config
-        || (
-          type == "directory" && (
-            baseName == ".idea" || baseName == ".vscode"
-          )
-        ) || lib.hasSuffix ".iml" baseName
-
-        # Filter out nix build files
-        || baseName == "Cargo.nix"
-
-        # Filter out editor backup / swap files.
-        || lib.hasSuffix "~" baseName
-        || builtins.match "^\\.sw[a-z]$$" baseName != null
-        || builtins.match "^\\..*\\.sw[a-z]$$" baseName != null
-        || lib.hasSuffix ".tmp" baseName
-        || lib.hasSuffix ".bak" baseName
-        || baseName == "tests.nix"
-      );
-
-  /* Returns a crate which depends on successful test execution
-     of crate given as the second argument.
-
-     testCrateFlags: list of flags to pass to the test exectuable
-     testInputs: list of packages that should be available during test execution
-  */
-  crateWithTest = { crate, testCrate, testCrateFlags, testInputs }:
-    assert builtins.typeOf testCrateFlags == "list";
-    assert builtins.typeOf testInputs == "list";
-    let
-      # override the `crate` so that it will build and execute tests instead of
-      # building the actual lib and bin targets We just have to pass `--test`
-      # to rustc and it will do the right thing.  We execute the tests and copy
-      # their log and the test executables to $out for later inspection.
-      test =
-        let
-          drv = testCrate.override
-            (
-              _: {
-                buildTests = true;
-              }
-            );
-        in
-        pkgs.runCommand "run-tests-${testCrate.name}"
-          {
-            inherit testCrateFlags;
-            buildInputs = testInputs;
-          } ''
-          set -ex
-
-          export RUST_BACKTRACE=1
-
-          # recreate a file hierarchy as when running tests with cargo
-
-          # the source for test data
-          ${pkgs.xorg.lndir}/bin/lndir ${crate.src}
-
-          # build outputs
-          testRoot=target/debug
-          mkdir -p $testRoot
-
-          # executables of the crate
-          # we copy to prevent std::env::current_exe() to resolve to a store location
-          for i in ${crate}/bin/*; do
-            cp "$i" "$testRoot"
-          done
-          chmod +w -R .
-
-          # test harness executables are suffixed with a hash, like cargo does
-          # this allows to prevent name collision with the main
-          # executables of the crate
-          hash=$(basename $out)
-          for file in ${drv}/tests/*; do
-            f=$testRoot/$(basename $file)-$hash
-            cp $file $f
-            $f $testCrateFlags 2>&1 | tee -a $out
-          done
-        '';
-    in
-    pkgs.runCommand "${crate.name}-linked"
-      {
-        inherit (crate) outputs crateName;
-        passthru = (crate.passthru or { }) // {
-          inherit test;
-        };
-      } ''
-      echo tested by ${test}
-      ${lib.concatMapStringsSep "\n" (output: "ln -s ${crate.${output}} ${"$"}${output}") crate.outputs}
-    '';
-
-  /* A restricted overridable version of builtRustCratesWithFeatures. */
-  buildRustCrateWithFeatures =
-    { packageId
-    , features ? rootFeatures
-    , crateOverrides ? defaultCrateOverrides
-    , buildRustCrateFunc ? null
-    , runTests ? false
-    , testCrateFlags ? [ ]
-    , testInputs ? [ ]
-    }:
-    lib.makeOverridable
-      (
-        { features
-        , crateOverrides
-        , runTests
-        , testCrateFlags
-        , testInputs
-        }:
-        let
-          buildRustCrateFuncOverriden =
-            if buildRustCrateFunc != null
-            then buildRustCrateFunc
-            else
-              (
-                if crateOverrides == pkgs.defaultCrateOverrides
-                then buildRustCrate
-                else
-                  buildRustCrate.override {
-                    defaultCrateOverrides = crateOverrides;
-                  }
-              );
-          builtRustCrates = builtRustCratesWithFeatures {
-            inherit packageId features;
-            buildRustCrateFunc = buildRustCrateFuncOverriden;
-            runTests = false;
-          };
-          builtTestRustCrates = builtRustCratesWithFeatures {
-            inherit packageId features;
-            buildRustCrateFunc = buildRustCrateFuncOverriden;
-            runTests = true;
-          };
-          drv = builtRustCrates.${packageId};
-          testDrv = builtTestRustCrates.${packageId};
-          derivation =
-            if runTests then
-              crateWithTest
-                {
-                  crate = drv;
-                  testCrate = testDrv;
-                  inherit testCrateFlags testInputs;
-                }
-            else drv;
-        in
-        derivation
-      )
-      { inherit features crateOverrides runTests testCrateFlags testInputs; };
-
-  /* Returns an attr set with packageId mapped to the result of buildRustCrateFunc
-     for the corresponding crate.
-  */
-  builtRustCratesWithFeatures =
-    { packageId
-    , features
-    , crateConfigs ? crates
-    , buildRustCrateFunc
-    , runTests
-    , target ? defaultTarget
-    } @ args:
-      assert (builtins.isAttrs crateConfigs);
-      assert (builtins.isString packageId);
-      assert (builtins.isList features);
-      assert (builtins.isAttrs target);
-      assert (builtins.isBool runTests);
-      let
-        rootPackageId = packageId;
-        mergedFeatures = mergePackageFeatures
-          (
-            args // {
-              inherit rootPackageId;
-              target = target // { test = runTests; };
-            }
-          );
-        buildByPackageId = packageId: buildByPackageIdImpl packageId;
-
-        # Memoize built packages so that reappearing packages are only built once.
-        builtByPackageId =
-          lib.mapAttrs (packageId: value: buildByPackageId packageId) crateConfigs;
-        buildByPackageIdImpl = packageId:
-          let
-            features = mergedFeatures."${packageId}" or [ ];
-            crateConfig' = crateConfigs."${packageId}";
-            crateConfig =
-              builtins.removeAttrs crateConfig' [ "resolvedDefaultFeatures" "devDependencies" ];
-            devDependencies =
-              lib.optionals
-                (runTests && packageId == rootPackageId)
-                (crateConfig'.devDependencies or [ ]);
-            dependencies =
-              dependencyDerivations {
-                inherit builtByPackageId features target;
-                dependencies =
-                  (crateConfig.dependencies or [ ])
-                  ++ devDependencies;
-              };
-            buildDependencies =
-              dependencyDerivations {
-                inherit builtByPackageId features target;
-                dependencies = crateConfig.buildDependencies or [ ];
-              };
-            filterEnabledDependenciesForThis = dependencies: filterEnabledDependencies {
-              inherit dependencies features target;
-            };
-            dependenciesWithRenames =
-              lib.filter (d: d ? "rename")
-                (
-                  filterEnabledDependenciesForThis
-                    (
-                      (crateConfig.buildDependencies or [ ])
-                      ++ (crateConfig.dependencies or [ ])
-                      ++ devDependencies
-                    )
-                );
-            # Crate renames have the form:
-            #
-            # {
-            #    crate_name = [
-            #       { version = "1.2.3"; rename = "crate_name01"; }
-            #    ];
-            #    # ...
-            # }
-            crateRenames =
-              let
-                grouped =
-                  lib.groupBy
-                    (dependency: dependency.name)
-                    dependenciesWithRenames;
-                versionAndRename = dep:
-                  let
-                    package = builtByPackageId."${dep.packageId}";
-                  in
-                  { inherit (dep) rename; version = package.version; };
-              in
-              lib.mapAttrs (name: choices: builtins.map versionAndRename choices) grouped;
-          in
-          buildRustCrateFunc
-            (
-              crateConfig // {
-                src = crateConfig.src or (
-                  pkgs.fetchurl rec {
-                    name = "${crateConfig.crateName}-${crateConfig.version}.tar.gz";
-                    # https://www.pietroalbini.org/blog/downloading-crates-io/
-                    # Not rate-limited, CDN URL.
-                    url = "https://static.crates.io/crates/${crateConfig.crateName}/${crateConfig.crateName}-${crateConfig.version}.crate";
-                    sha256 =
-                      assert (lib.assertMsg (crateConfig ? sha256) "Missing sha256 for ${name}");
-                      crateConfig.sha256;
-                  }
-                );
-                extraRustcOpts = lib.lists.optional (targetFeatures != [ ]) "-C target-feature=${stdenv.lib.concatMapStringsSep "," (x: "+${x}") targetFeatures}";
-                inherit features dependencies buildDependencies crateRenames release;
-              }
-            );
-      in
-      builtByPackageId;
-
-  /* Returns the actual derivations for the given dependencies. */
-  dependencyDerivations =
-    { builtByPackageId
-    , features
-    , dependencies
-    , target
-    }:
-      assert (builtins.isAttrs builtByPackageId);
-      assert (builtins.isList features);
-      assert (builtins.isList dependencies);
-      assert (builtins.isAttrs target);
-      let
-        enabledDependencies = filterEnabledDependencies {
-          inherit dependencies features target;
-        };
-        depDerivation = dependency: builtByPackageId.${dependency.packageId};
-      in
-      map depDerivation enabledDependencies;
-
-  /* Returns a sanitized version of val with all values substituted that cannot
-     be serialized as JSON.
-  */
-  sanitizeForJson = val:
-    if builtins.isAttrs val
-    then lib.mapAttrs (n: v: sanitizeForJson v) val
-    else if builtins.isList val
-    then builtins.map sanitizeForJson val
-    else if builtins.isFunction val
-    then "function"
-    else val;
-
-  /* Returns various tools to debug a crate. */
-  debugCrate = { packageId, target ? defaultTarget }:
-    assert (builtins.isString packageId);
-    let
-      debug = rec {
-        # The built tree as passed to buildRustCrate.
-        buildTree = buildRustCrateWithFeatures {
-          buildRustCrateFunc = lib.id;
-          inherit packageId;
-        };
-        sanitizedBuildTree = sanitizeForJson buildTree;
-        dependencyTree = sanitizeForJson
-          (
-            buildRustCrateWithFeatures {
-              buildRustCrateFunc = crate: {
-                "01_crateName" = crate.crateName or false;
-                "02_features" = crate.features or [ ];
-                "03_dependencies" = crate.dependencies or [ ];
-              };
-              inherit packageId;
-            }
-          );
-        mergedPackageFeatures = mergePackageFeatures {
-          features = rootFeatures;
-          inherit packageId target;
-        };
-        diffedDefaultPackageFeatures = diffDefaultPackageFeatures {
-          inherit packageId target;
-        };
-      };
-    in
-    { internal = debug; };
-
-  /* Returns differences between cargo default features and crate2nix default
-     features.
-
-     This is useful for verifying the feature resolution in crate2nix.
-  */
-  diffDefaultPackageFeatures =
-    { crateConfigs ? crates
-    , packageId
-    , target
-    }:
-      assert (builtins.isAttrs crateConfigs);
-      let
-        prefixValues = prefix: lib.mapAttrs (n: v: { "${prefix}" = v; });
-        mergedFeatures =
-          prefixValues
-            "crate2nix"
-            (mergePackageFeatures { inherit crateConfigs packageId target; features = [ "default" ]; });
-        configs = prefixValues "cargo" crateConfigs;
-        combined = lib.foldAttrs (a: b: a // b) { } [ mergedFeatures configs ];
-        onlyInCargo =
-          builtins.attrNames
-            (lib.filterAttrs (n: v: !(v ? "crate2nix") && (v ? "cargo")) combined);
-        onlyInCrate2Nix =
-          builtins.attrNames
-            (lib.filterAttrs (n: v: (v ? "crate2nix") && !(v ? "cargo")) combined);
-        differentFeatures = lib.filterAttrs
-          (
-            n: v:
-              (v ? "crate2nix")
-              && (v ? "cargo")
-              && (v.crate2nix.features or [ ]) != (v."cargo".resolved_default_features or [ ])
-          )
-          combined;
-      in
-      builtins.toJSON {
-        inherit onlyInCargo onlyInCrate2Nix differentFeatures;
-      };
-
-  /* Returns an attrset mapping packageId to the list of enabled features.
-
-     If multiple paths to a dependency enable different features, the
-     corresponding feature sets are merged. Features in rust are additive.
-  */
-  mergePackageFeatures =
-    { crateConfigs ? crates
-    , packageId
-    , rootPackageId ? packageId
-    , features ? rootFeatures
-    , dependencyPath ? [ crates.${packageId}.crateName ]
-    , featuresByPackageId ? { }
-    , target
-      # Adds devDependencies to the crate with rootPackageId.
-    , runTests ? false
-    , ...
-    } @ args:
-      assert (builtins.isAttrs crateConfigs);
-      assert (builtins.isString packageId);
-      assert (builtins.isString rootPackageId);
-      assert (builtins.isList features);
-      assert (builtins.isList dependencyPath);
-      assert (builtins.isAttrs featuresByPackageId);
-      assert (builtins.isAttrs target);
-      assert (builtins.isBool runTests);
-      let
-        crateConfig = crateConfigs."${packageId}" or (builtins.throw "Package not found: ${packageId}");
-        expandedFeatures = expandFeatures (crateConfig.features or { }) features;
-        depWithResolvedFeatures = dependency:
-          let
-            packageId = dependency.packageId;
-            features = dependencyFeatures expandedFeatures dependency;
-          in
-          { inherit packageId features; };
-        resolveDependencies = cache: path: dependencies:
-          assert (builtins.isAttrs cache);
-          assert (builtins.isList dependencies);
-          let
-            enabledDependencies = filterEnabledDependencies {
-              inherit dependencies target;
-              features = expandedFeatures;
-            };
-            directDependencies = map depWithResolvedFeatures enabledDependencies;
-            foldOverCache = op: lib.foldl op cache directDependencies;
-          in
-          foldOverCache
-            (
-              cache: { packageId, features }:
-                let
-                  cacheFeatures = cache.${packageId} or [ ];
-                  combinedFeatures = sortedUnique (cacheFeatures ++ features);
-                in
-                if cache ? ${packageId} && cache.${packageId} == combinedFeatures
-                then cache
-                else
-                  mergePackageFeatures {
-                    features = combinedFeatures;
-                    featuresByPackageId = cache;
-                    inherit crateConfigs packageId target runTests rootPackageId;
-                  }
-            );
-        cacheWithSelf =
-          let
-            cacheFeatures = featuresByPackageId.${packageId} or [ ];
-            combinedFeatures = sortedUnique (cacheFeatures ++ expandedFeatures);
-          in
-          featuresByPackageId // {
-            "${packageId}" = combinedFeatures;
-          };
-        cacheWithDependencies =
-          resolveDependencies cacheWithSelf "dep"
-            (
-              crateConfig.dependencies or [ ]
-              ++ lib.optionals
-                (runTests && packageId == rootPackageId)
-                (crateConfig.devDependencies or [ ])
-            );
-        cacheWithAll =
-          resolveDependencies
-            cacheWithDependencies "build"
-            (crateConfig.buildDependencies or [ ]);
-      in
-      cacheWithAll;
-
-  /* Returns the enabled dependencies given the enabled features. */
-  filterEnabledDependencies = { dependencies, features, target }:
-    assert (builtins.isList dependencies);
-    assert (builtins.isList features);
-    assert (builtins.isAttrs target);
-
-    lib.filter
-      (
-        dep:
-        let
-          targetFunc = dep.target or (features: true);
-        in
-        targetFunc { inherit features target; }
-        && (
-          !(dep.optional or false)
-          || builtins.any (doesFeatureEnableDependency dep) features
-        )
-      )
-      dependencies;
-
-  /* Returns whether the given feature should enable the given dependency. */
-  doesFeatureEnableDependency = { name, rename ? null, ... }: feature:
-    let
-      prefix = "${name}/";
-      len = builtins.stringLength prefix;
-      startsWithPrefix = builtins.substring 0 len feature == prefix;
-    in
-    (rename == null && feature == name)
-    || (rename != null && rename == feature)
-    || startsWithPrefix;
-
-  /* Returns the expanded features for the given inputFeatures by applying the
-     rules in featureMap.
-
-     featureMap is an attribute set which maps feature names to lists of further
-     feature names to enable in case this feature is selected.
-  */
-  expandFeatures = featureMap: inputFeatures:
-    assert (builtins.isAttrs featureMap);
-    assert (builtins.isList inputFeatures);
-    let
-      expandFeature = feature:
-        assert (builtins.isString feature);
-        [ feature ] ++ (expandFeatures featureMap (featureMap."${feature}" or [ ]));
-      outFeatures = lib.concatMap expandFeature inputFeatures;
-    in
-    sortedUnique outFeatures;
-
-  /*
-     Returns the actual features for the given dependency.
-
-     features: The features of the crate that refers this dependency.
-  */
-  dependencyFeatures = features: dependency:
-    assert (builtins.isList features);
-    assert (builtins.isAttrs dependency);
-    let
-      defaultOrNil =
-        if dependency.usesDefaultFeatures or true
-        then [ "default" ]
-        else [ ];
-      explicitFeatures = dependency.features or [ ];
-      additionalDependencyFeatures =
-        let
-          dependencyPrefix = (dependency.rename or dependency.name) + "/";
-          dependencyFeatures =
-            builtins.filter (f: lib.hasPrefix dependencyPrefix f) features;
-        in
-        builtins.map (lib.removePrefix dependencyPrefix) dependencyFeatures;
-    in
-    defaultOrNil ++ explicitFeatures ++ additionalDependencyFeatures;
-
-  /* Sorts and removes duplicates from a list of strings. */
-  sortedUnique = features:
-    assert (builtins.isList features);
-    assert (builtins.all builtins.isString features);
-    let
-      outFeaturesSet = lib.foldl (set: feature: set // { "${feature}" = 1; }) { } features;
-      outFeaturesUnique = builtins.attrNames outFeaturesSet;
-    in
-    builtins.sort (a: b: a < b) outFeaturesUnique;
-
-  deprecationWarning = message: value:
-    if strictDeprecation
-    then builtins.throw "strictDeprecation enabled, aborting: ${message}"
-    else builtins.trace message value;
-
-  #
-  # crate2nix/default.nix (excerpt end)
-  #
-
-  };
-}
diff --git a/README.md b/README.md
index 731e004..62d99a3 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,9 @@ Colmena is still an early prototype.
 
 ## Tutorial
 
-Enter a `nix-shell` with `colmena` with:
+Enter a shell with `colmena` with:
 ```
-nix-shell test-shell.nix
+nix-shell
 ```
 
 Colmena should work with your existing NixOps and Morph configurations with minimal modification.
diff --git a/default.nix b/default.nix
index 07888cd..10454d4 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,14 @@
 {
   pkgs ? import ./pkgs.nix {},
 }: let
-  cargo = pkgs.callPackage ./Cargo.nix {};
-in cargo.rootCrate.build
+  rustPlatform = if pkgs ? pinnedRust then pkgs.makeRustPlatform {
+    rustc = pkgs.pinnedRust;
+    cargo = pkgs.pinnedRust;
+  } else pkgs.rustPlatform;
+in rustPlatform.buildRustPackage {
+  name = "colmena-dev";
+  version = "0.1.0";
+
+  src = ./.;
+  cargoSha256 = "06qw50wd8w9b6j7hayx75c9hvff9kxa0cllaqg8x854b1ww9pk8j";
+}
diff --git a/test-shell.nix b/dev-shell.nix
similarity index 66%
rename from test-shell.nix
rename to dev-shell.nix
index 812d748..d1bd66e 100644
--- a/test-shell.nix
+++ b/dev-shell.nix
@@ -2,6 +2,6 @@ let
   pkgs = import ./pkgs.nix {};
 in pkgs.mkShell {
   buildInputs = with pkgs; [
-    (import ./Cargo.nix {}).rootCrate.build
+    pinnedRust
   ];
 }
diff --git a/nix/sources.json b/nix/sources.json
index f2d8a9f..ef8887e 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -1,16 +1,4 @@
 {
-    "crate2nix": {
-        "branch": "master",
-        "description": "nix build file generator for rust crates",
-        "homepage": "",
-        "owner": "kolloch",
-        "repo": "crate2nix",
-        "rev": "0c81027889259c6a45221a157f9c4a56e7235c85",
-        "sha256": "0wp1i83ralnz0v6a95122d0hfzwlg1281lvv3mzrxcxl8mka8z3n",
-        "type": "tarball",
-        "url": "https://github.com/kolloch/crate2nix/archive/0c81027889259c6a45221a157f9c4a56e7235c85.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
     "niv": {
         "branch": "master",
         "description": "Easy dependency management for Nix projects",
diff --git a/pkgs.nix b/pkgs.nix
index 26bb456..b01ded9 100644
--- a/pkgs.nix
+++ b/pkgs.nix
@@ -11,11 +11,9 @@
           date = rustNightly;
         };
       in rec {
-        rustc = rustChannel.rust.override {
+        pinnedRust = rustChannel.rust.override {
           extensions = [ "rust-src" ];
         };
-        inherit (rustChannel) cargo rust-fmt rust-std clippy;
-        crate2nix = super.callPackage sources.crate2nix {};
       })
     ];
   };
diff --git a/shell.nix b/shell.nix
index c3260a2..c1ce7c2 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,8 +1,7 @@
 let
   pkgs = import ./pkgs.nix {};
 in pkgs.mkShell {
-  buildInputs = with pkgs; [
-    #rust
-    crate2nix
+  buildInputs = [
+    (import ./default.nix {})
   ];
 }