diff --git a/Cargo.nix b/Cargo.nix
deleted file mode 100644
index 9b00a11..0000000
--- a/Cargo.nix
+++ /dev/null
@@ -1,7223 +0,0 @@
-
-# This file was @generated by crate2nix 0.7.0-rc.2 with the command:
-#   "generate"
-# See https://github.com/kolloch/crate2nix for more info.
-
-{ 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
-}:
-
-rec {
-  #
-  # "public" attributes that we attempt to keep stable with new versions of crate2nix.
-  #
-
-  rootCrate = rec {
-    packageId = "hoc 0.11.5 (path+file:///home/me/Codes/rust/hoc)";
-
-    # 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; };
-  };
-  root_crate =
-    internal.deprecationWarning 
-      "root_crate is deprecated since crate2nix 0.4. Please use rootCrate instead." 
-      rootCrate.build;
-  # Refer your crate build derivation by name here.
-  # You can override the features with
-  # workspaceMembers."${crateName}".build.override { features = [ "default" "feature1" ... ]; }.
-  workspaceMembers = {
-    "hoc" = rec {
-      packageId = "hoc 0.11.5 (path+file:///home/me/Codes/rust/hoc)";
-      build = internal.buildRustCrateWithFeatures {
-        packageId = "hoc 0.11.5 (path+file:///home/me/Codes/rust/hoc)";
-      };
-
-      # Debug support which might change between releases.
-      # File a bug if you depend on any for non-debug work!
-      debug = internal.debugCrate { inherit packageId; };
-    };
-  };
-  workspace_members =
-    internal.deprecationWarning
-      "workspace_members is deprecated in crate2nix 0.4. Please use workspaceMembers instead."
-      lib.mapAttrs (n: v: v.build) workspaceMembers;
-
-  #
-  # "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:
-    # * `crateBin = [{name = ","; path = ",";}];`: a hack to disable building the binary.
-    # * `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 = {
-      "actix-codec 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "actix-codec";
-        version = "0.2.0";
-        edition = "2018";
-        sha256 = "100k0n155fnnjqjz2s1gnwim2fp7s1mw942x0famg89cbh55zr89";
-        libName = "actix_codec";
-        authors = [
-          "Nikolay Kim <fafhrd91@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "bitflags";
-            packageId = "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "bytes";
-            packageId = "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "futures-core";
-            packageId = "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "futures-sink";
-            packageId = "futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "log";
-            packageId = "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "tokio";
-            packageId = "tokio 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "tokio-util";
-            packageId = "tokio-util 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)";
-            usesDefaultFeatures = false;
-            features = [ "codec" ];
-          }
-        ];
-        
-      };
-      "actix-connect 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "actix-connect";
-        version = "1.0.2";
-        edition = "2018";
-        sha256 = "0v77m394gzbrrzg12xkqgli11vwhig0zcxy3yhmq1s91j9bcjp69";
-        libName = "actix_connect";
-        authors = [
-          "Nikolay Kim <fafhrd91@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "actix-codec";
-            packageId = "actix-codec 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-rt";
-            packageId = "actix-rt 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-service";
-            packageId = "actix-service 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-utils";
-            packageId = "actix-utils 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "derive_more";
-            packageId = "derive_more 0.99.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "either";
-            packageId = "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "futures";
-            packageId = "futures 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "http";
-            packageId = "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)";
-            optional = true;
-          }
-          {
-            name = "log";
-            packageId = "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "trust-dns-proto";
-            packageId = "trust-dns-proto 0.18.0-alpha.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "trust-dns-resolver";
-            packageId = "trust-dns-resolver 0.18.0-alpha.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        features = {
-          "default" = [ "uri" ];
-          "openssl" = [ "open-ssl" "tokio-openssl" ];
-          "rustls" = [ "rust-tls" "tokio-rustls" "webpki" ];
-          "uri" = [ "http" ];
-        };
-        resolvedDefaultFeatures = [ "default" "http" "uri" ];
-      };
-      "actix-http 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "actix-http";
-        version = "1.0.1";
-        edition = "2018";
-        sha256 = "06chrs9asbxmxzgiw5sw7ky97yrin9g88nmd6w407a6y9z668rn1";
-        libName = "actix_http";
-        authors = [
-          "Nikolay Kim <fafhrd91@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "actix-codec";
-            packageId = "actix-codec 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-connect";
-            packageId = "actix-connect 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-rt";
-            packageId = "actix-rt 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-service";
-            packageId = "actix-service 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-threadpool";
-            packageId = "actix-threadpool 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-utils";
-            packageId = "actix-utils 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "base64";
-            packageId = "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "bitflags";
-            packageId = "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "brotli2";
-            packageId = "brotli2 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)";
-            optional = true;
-          }
-          {
-            name = "bytes";
-            packageId = "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "chrono";
-            packageId = "chrono 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "copyless";
-            packageId = "copyless 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "derive_more";
-            packageId = "derive_more 0.99.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "either";
-            packageId = "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "encoding_rs";
-            packageId = "encoding_rs 0.8.22 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "failure";
-            packageId = "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)";
-            rename = "fail-ure";
-            optional = true;
-          }
-          {
-            name = "flate2";
-            packageId = "flate2 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)";
-            optional = true;
-          }
-          {
-            name = "futures-channel";
-            packageId = "futures-channel 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "futures-core";
-            packageId = "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "futures-util";
-            packageId = "futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "fxhash";
-            packageId = "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "h2";
-            packageId = "h2 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "http";
-            packageId = "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "httparse";
-            packageId = "httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
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-            packageId = "indexmap 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
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-          }
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-            packageId = "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "log";
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-          }
-          {
-            name = "mime";
-            packageId = "mime 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "percent-encoding";
-            packageId = "percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "pin-project";
-            packageId = "pin-project 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "rand";
-            packageId = "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "regex";
-            packageId = "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
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-          {
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-            packageId = "serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "sha1";
-            packageId = "sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "slab";
-            packageId = "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "time";
-            packageId = "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        devDependencies = [
-          {
-            name = "actix-connect";
-            packageId = "actix-connect 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)";
-            features = [ "openssl" ];
-          }
-        ];
-        features = {
-          "compress" = [ "flate2" "brotli2" ];
-          "failure" = [ "fail-ure" ];
-          "openssl" = [ "actix-tls/openssl" "actix-connect/openssl" ];
-          "rustls" = [ "actix-tls/rustls" "actix-connect/rustls" ];
-          "secure-cookies" = [ "ring" ];
-        };
-        resolvedDefaultFeatures = [ "brotli2" "compress" "default" "fail-ure" "failure" "flate2" ];
-      };
-      "actix-macros 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "actix-macros";
-        version = "0.1.1";
-        edition = "2018";
-        sha256 = "1dhn4fvw79pfnq5sc12pbq0wc06di4xfg4288fcbrr5vfvf5lw11";
-        procMacro = true;
-        authors = [
-          "Nikolay Kim <fafhrd91@gmail.com>"
-        ];
-        dependencies = [
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-          }
-          {
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-            packageId = "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)";
-            features = [ "full" ];
-          }
-        ];
-        
-      };
-      "actix-router 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "actix-router";
-        version = "0.2.4";
-        edition = "2018";
-        sha256 = "1j1y7l4k2dfj3h72p81waskajyxrl6mp6lbwm3kwis4l9p510ylx";
-        libName = "actix_router";
-        authors = [
-          "Nikolay Kim <fafhrd91@gmail.com>"
-        ];
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-        features = {
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-        };
-        resolvedDefaultFeatures = [ "default" "http" ];
-      };
-      "actix-rt 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "actix-rt";
-        version = "1.0.0";
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-        sha256 = "0vgvnljgc4i40xwy5zxgiiyfcraam0k0sbvb94d48ikha1ahlsiz";
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-        authors = [
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-            features = [ "rt-core" "rt-util" "io-driver" "tcp" "uds" "udp" "time" "signal" "stream" ];
-          }
-        ];
-        
-      };
-      "actix-server 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "actix-server";
-        version = "1.0.1";
-        edition = "2018";
-        sha256 = "06l4y449sc74rd62a9snf4gqcjw8bjrjx0kvkpja6g60m9g4blsi";
-        libName = "actix_server";
-        authors = [
-          "Nikolay Kim <fafhrd91@gmail.com>"
-        ];
-        dependencies = [
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-          {
-            name = "actix-rt";
-            packageId = "actix-rt 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "actix-service";
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-            packageId = "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)";
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-          {
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-          {
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-            packageId = "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)";
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-        features = {
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "actix-service 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
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-        version = "1.0.5";
-        edition = "2018";
-        sha256 = "0r3m51fackpwj73awg2fkr4yic4abyw4dfyhn9ql3qm7vyazrr6k";
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-        authors = [
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-        ];
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-          {
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-            packageId = "pin-project 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        
-      };
-      "actix-testing 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "actix-testing";
-        version = "1.0.0";
-        edition = "2018";
-        sha256 = "04f969nz596y9v0f07h8sw1yx8r2nvwslx7q1kzsh3idnx2lfja8";
-        libName = "actix_testing";
-        authors = [
-          "Nikolay Kim <fafhrd91@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "actix-macros";
-            packageId = "actix-macros 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
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-            packageId = "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "serde";
-            packageId = "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)";
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-          {
-            name = "serde_json";
-            packageId = "serde_json 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)";
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-            name = "serde_urlencoded";
-            packageId = "serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
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-        devDependencies = [
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-            name = "actix-http";
-            packageId = "actix-http 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)";
-            features = [ "openssl" ];
-          }
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-        features = {
-          "compress" = [ "actix-http/compress" ];
-          "default" = [ "compress" ];
-          "openssl" = [ "open-ssl" "actix-http/openssl" ];
-          "rustls" = [ "rust-tls" "actix-http/rustls" ];
-        };
-        resolvedDefaultFeatures = [ "compress" ];
-      };
-      "backtrace 0.3.44 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "backtrace";
-        version = "0.3.44";
-        edition = "2018";
-        sha256 = "0djmbf6caj7qm2p7jw6wzjxc83sji9gdd8vjp9mg2g0gyjdnn0z4";
-        authors = [
-          "The Rust Project Developers"
-        ];
-        dependencies = [
-          {
-            name = "backtrace-sys";
-            packageId = "backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)";
-            optional = true;
-          }
-          {
-            name = "cfg-if";
-            packageId = "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "libc";
-            packageId = "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)";
-            usesDefaultFeatures = false;
-          }
-          {
-            name = "rustc-demangle";
-            packageId = "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        features = {
-          "default" = [ "std" "libunwind" "libbacktrace" "dladdr" "dbghelp" ];
-          "gimli-symbolize" = [ "addr2line" "findshlibs" "memmap" "goblin" ];
-          "libbacktrace" = [ "backtrace-sys" ];
-          "rustc-dep-of-std" = [ "backtrace-sys/rustc-dep-of-std" "cfg-if/rustc-dep-of-std" "core" "compiler_builtins" "libc/rustc-dep-of-std" "rustc-demangle/rustc-dep-of-std" ];
-          "serialize-rustc" = [ "rustc-serialize" ];
-          "serialize-serde" = [ "serde" ];
-          "verify-winapi" = [ "winapi/dbghelp" "winapi/handleapi" "winapi/libloaderapi" "winapi/minwindef" "winapi/processthreadsapi" "winapi/synchapi" "winapi/winbase" "winapi/winnt" ];
-        };
-        resolvedDefaultFeatures = [ "backtrace-sys" "dbghelp" "default" "dladdr" "libbacktrace" "libunwind" "std" ];
-      };
-      "backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "backtrace-sys";
-        version = "0.1.32";
-        edition = "2015";
-        sha256 = "14c406z8bdmms8a5l8cv79jfkz1mk10qk5p97izf4vai53qparax";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "libc";
-            packageId = "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)";
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-        buildDependencies = [
-          {
-            name = "cc";
-            packageId = "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)";
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-        features = {
-          "rustc-dep-of-std" = [ "core" "compiler_builtins" ];
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-      };
-      "badge 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "badge";
-        version = "0.2.0";
-        edition = "2015";
-        sha256 = "014np5njm4alz5xsavj2wky8hpx500rs6zq2d87vjdklcbza5f46";
-        libPath = "badge.rs";
-        authors = [
-          "Onur Aslan <onur@onur.im>"
-        ];
-        dependencies = [
-          {
-            name = "base64";
-            packageId = "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "rusttype";
-            packageId = "rusttype 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        
-      };
-      "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "base64";
-        version = "0.11.0";
-        edition = "2018";
-        sha256 = "1iqmims6yvr6vwzyy54qd672zw29ipjj17p8klcr578c9ajpw6xl";
-        authors = [
-          "Alice Maz <alice@alicemaz.com>"
-          "Marshall Pierce <marshall@mpierce.org>"
-        ];
-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
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-      "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "base64";
-        version = "0.9.3";
-        edition = "2015";
-        sha256 = "0hs62r35bgxslawyrn1vp9rmvrkkm76fqv0vqcwd048vs876r7a8";
-        authors = [
-          "Alice Maz <alice@alicemaz.com>"
-          "Marshall Pierce <marshall@mpierce.org>"
-        ];
-        dependencies = [
-          {
-            name = "byteorder";
-            packageId = "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "safemem";
-            packageId = "safemem 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
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-        
-      };
-      "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "bitflags";
-        version = "1.2.1";
-        edition = "2015";
-        sha256 = "14qnd5nq8p2almk79m4m8ydqhd413yaxsyjp5xd19g3mikzf47fg";
-        authors = [
-          "The Rust Project Developers"
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-        features = {
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "brotli-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "brotli-sys";
-        version = "0.3.2";
-        edition = "2015";
-        sha256 = "1kdfdbcba6zwa13xpjwgiplblkdf6vigxjbwwp6l2ascbylxwia4";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "libc";
-            packageId = "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        buildDependencies = [
-          {
-            name = "cc";
-            packageId = "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
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-        
-      };
-      "brotli2 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "brotli2";
-        version = "0.3.2";
-        edition = "2015";
-        sha256 = "13jnhpmfkqy2xar4lxrsk3rx3i12bgnarnsxq4arhc6yxb1kdc0c";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "brotli-sys";
-            packageId = "brotli-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
-            name = "libc";
-            packageId = "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
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-        
-      };
-      "bumpalo 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "bumpalo";
-        version = "3.2.0";
-        edition = "2018";
-        sha256 = "0hpp4wfcn04gnl1ji4a80b85xwknsci81xqyllq174gq9z0rsd8z";
-        authors = [
-          "Nick Fitzgerald <fitzgen@gmail.com>"
-        ];
-        features = {
-        };
-        resolvedDefaultFeatures = [ "default" ];
-      };
-      "bytecount 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "bytecount";
-        version = "0.6.0";
-        edition = "2018";
-        sha256 = "0vplsx73zncb7mz8x0fs3k0p0rz5bmavj09vjk5nqn4z6fa7h0dh";
-        authors = [
-          "Andre Bogus <bogusandre@gmail.de>"
-          "Joshua Landau <joshua@landau.ws>"
-        ];
-        features = {
-          "generic-simd" = [ "packed_simd" ];
-        };
-      };
-      "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "byteorder";
-        version = "1.3.4";
-        edition = "2015";
-        sha256 = "1pkjfhgjnq898g1d38ygcfi0msg3m6756cwv0sgysj1d26p8mi08";
-        authors = [
-          "Andrew Gallant <jamslam@gmail.com>"
-        ];
-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
-      };
-      "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "bytes";
-        version = "0.5.4";
-        edition = "2018";
-        sha256 = "1q9r7si1l8vndg4n2ny2nv833ghp5vyqzk5indb9rmhd5ibaq2hk";
-        authors = [
-          "Carl Lerche <me@carllerche.com>"
-          "Sean McArthur <sean@seanmonstar.com>"
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-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
-      };
-      "bytestring 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "bytestring";
-        version = "0.1.4";
-        edition = "2018";
-        sha256 = "1m7advs49l66s7nj72ic6scx1c1y8ah64k06fj4crxlfymkp89pw";
-        authors = [
-          "Nikolay Kim <fafhrd91@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "bytes";
-            packageId = "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)";
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-        
-      };
-      "c2-chacha 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "c2-chacha";
-        version = "0.2.3";
-        edition = "2018";
-        sha256 = "1fzn2n9k51b8wp4m41pkdzwlk1dbkjb6ha9rqdp4jfmzl753hhi1";
-        authors = [
-          "The CryptoCorrosion Contributors"
-        ];
-        dependencies = [
-          {
-            name = "ppv-lite86";
-            packageId = "ppv-lite86 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)";
-            rename = "ppv-lite86";
-            usesDefaultFeatures = false;
-          }
-        ];
-        features = {
-          "default" = [ "std" "simd" "rustcrypto_api" ];
-          "rustcrypto_api" = [ "stream-cipher" "byteorder" ];
-          "simd" = [ "ppv-lite86/simd" ];
-          "std" = [ "ppv-lite86/std" ];
-        };
-        resolvedDefaultFeatures = [ "simd" "std" ];
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-      "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "cc";
-        version = "1.0.50";
-        edition = "2018";
-        # Hack to suppress building binaries
-        crateBin = [ { name = ","; path = ","; } ];
-        sha256 = "1kdqm8ka7xg9h56b694pcz29ka33fsz27mzrphqc78gx96h8zqlm";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
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-      "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "cfg-if";
-        version = "0.1.10";
-        edition = "2018";
-        sha256 = "08h80ihs74jcyp24cd75wwabygbbdgl05k6p5dmq8akbr78vv1a7";
-        authors = [
-          "Alex Crichton <alex@alexcrichton.com>"
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-        features = {
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-      "chrono 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "chrono";
-        version = "0.4.10";
-        edition = "2015";
-        sha256 = "00dw7k11hmkm7yhc1v9pi0lrk0n28k4r3rh9g9pk3bkb9m50p19i";
-        authors = [
-          "Kang Seonghoon <public+rust@mearie.org>"
-          "Brandon W Maister <quodlibetor@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "num-integer";
-            packageId = "num-integer 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)";
-            usesDefaultFeatures = false;
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-          {
-            name = "num-traits";
-            packageId = "num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)";
-            usesDefaultFeatures = false;
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-          {
-            name = "time";
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-            optional = true;
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-        features = {
-          "bench" = [ "std" ];
-          "clock" = [ "time" "std" ];
-          "default" = [ "clock" "std" ];
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-        resolvedDefaultFeatures = [ "clock" "default" "std" "time" ];
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-      "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "clap";
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-        edition = "2015";
-        sha256 = "1nf6ld3bims1n5vfzhkvcb55pdzh04bbhzf8nil5vvw05nxzarsh";
-        authors = [
-          "Kevin K. <kbknapp@gmail.com>"
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-        dependencies = [
-          {
-            name = "ansi_term";
-            packageId = "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)";
-            optional = true;
-            target = { target, features }: (!target."windows");
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-          {
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-            optional = true;
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-          {
-            name = "bitflags";
-            packageId = "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)";
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-          {
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-            packageId = "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)";
-            optional = true;
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-          {
-            name = "textwrap";
-            packageId = "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)";
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-          {
-            name = "unicode-width";
-            packageId = "unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)";
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-          {
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-            packageId = "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)";
-            optional = true;
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-        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" ];
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-        resolvedDefaultFeatures = [ "ansi_term" "atty" "color" "default" "strsim" "suggestions" "vec_map" ];
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-      "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "cloudabi";
-        version = "0.0.3";
-        edition = "2015";
-        sha256 = "0kxcg83jlihy0phnd2g8c2c303px3l2p3pkjz357ll6llnd5pz6x";
-        libPath = "cloudabi.rs";
-        authors = [
-          "Nuxi (https://nuxi.nl/) and contributors"
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-        dependencies = [
-          {
-            name = "bitflags";
-            packageId = "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)";
-            optional = true;
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-        features = {
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-        resolvedDefaultFeatures = [ "bitflags" "default" ];
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-      "copyless 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "copyless";
-        version = "0.1.4";
-        edition = "2018";
-        sha256 = "09s1fagd14fqch3xq9ijschay014la2i8hqfxw2rr95jkxncbybg";
-        authors = [
-          "Dzmitry Malyshau <kvarkus@gmail.com>"
-        ];
-        
-      };
-      "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "core-foundation";
-        version = "0.6.4";
-        edition = "2015";
-        sha256 = "0va97wf49c8dzm9c8pgyk1jn7z21rl0bj1syf2zz5m2z2hzy1f95";
-        authors = [
-          "The Servo Project Developers"
-        ];
-        dependencies = [
-          {
-            name = "core-foundation-sys";
-            packageId = "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)";
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-          {
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-            packageId = "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)";
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-        features = {
-          "mac_os_10_7_support" = [ "core-foundation-sys/mac_os_10_7_support" ];
-          "mac_os_10_8_features" = [ "core-foundation-sys/mac_os_10_8_features" ];
-          "with-chrono" = [ "chrono" ];
-          "with-uuid" = [ "uuid" ];
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-      "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "core-foundation-sys";
-        version = "0.6.2";
-        edition = "2015";
-        sha256 = "0fzsw1j9g1x598yhwklg59l15hwzc0pyvs01w9fg2kin4598mjp7";
-        authors = [
-          "The Servo Project Developers"
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-        features = {
-        };
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-      "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "crc32fast";
-        version = "1.2.0";
-        edition = "2015";
-        sha256 = "1c9dhkvf3brrzzplcijaywxi2w8wv5578i0ryhcm7x8dmzi5s4ms";
-        authors = [
-          "Sam Rijs <srijs@airpost.net>"
-          "Alex Crichton <alex@alexcrichton.com>"
-        ];
-        dependencies = [
-          {
-            name = "cfg-if";
-            packageId = "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)";
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-        features = {
-          "default" = [ "std" ];
-        };
-        resolvedDefaultFeatures = [ "default" "std" ];
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-      "derive_more 0.99.2 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "derive_more";
-        version = "0.99.2";
-        edition = "2018";
-        sha256 = "1s6a87q7izsj3i786gify9swf05h9c1ygg0mhgk6v5kr542bwn91";
-        procMacro = true;
-        authors = [
-          "Jelte Fennema <github-tech@jeltef.nl>"
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-        dependencies = [
-          {
-            name = "proc-macro2";
-            packageId = "proc-macro2 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)";
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-          {
-            name = "quote";
-            packageId = "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-          {
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-            packageId = "syn 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)";
-            features = [ "extra-traits" ];
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-        features = {
-          "default" = [ "add_assign" "add" "as_mut" "as_ref" "constructor" "deref" "deref_mut" "display" "from" "from_str" "index" "index_mut" "into" "into_iterator" "iterator" "mul_assign" "mul" "not" "sum" "try_into" ];
-          "generate-parsing-rs" = [ "peg" ];
-        };
-        resolvedDefaultFeatures = [ "add" "add_assign" "as_mut" "as_ref" "constructor" "default" "deref" "deref_mut" "display" "from" "from_str" "index" "index_mut" "into" "into_iterator" "iterator" "mul" "mul_assign" "not" "sum" "try_into" ];
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-      "dtoa 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "dtoa";
-        version = "0.4.5";
-        edition = "2015";
-        sha256 = "18qycvcp0vaqzw0j784ansbxgs39l54ini9v719cy2cs3ghsjn23";
-        authors = [
-          "David Tolnay <dtolnay@gmail.com>"
-        ];
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-            name = "winapi-i686-pc-windows-gnu";
-            packageId = "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)";
-            target = { target, features }: (stdenv.hostPlatform.config == "i686-pc-windows-gnu");
-          }
-          {
-            name = "winapi-x86_64-pc-windows-gnu";
-            packageId = "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)";
-            target = { target, features }: (stdenv.hostPlatform.config == "x86_64-pc-windows-gnu");
-          }
-        ];
-        features = {
-          "debug" = [ "impl-debug" ];
-        };
-        resolvedDefaultFeatures = [ "consoleapi" "errhandlingapi" "fileapi" "handleapi" "impl-debug" "impl-default" "lmcons" "minschannel" "minwinbase" "minwindef" "ntdef" "ntstatus" "processenv" "processthreadsapi" "profileapi" "schannel" "securitybaseapi" "sspi" "std" "sysinfoapi" "timezoneapi" "winbase" "wincon" "wincrypt" "winerror" "winnt" "winreg" "winsock2" "wow64apiset" "ws2def" "ws2ipdef" "ws2tcpip" ];
-      };
-      "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "winapi-build";
-        version = "0.1.1";
-        edition = "2015";
-        sha256 = "1g4rqsgjky0a7530qajn2bbfcrl2v0zb39idgdws9b1l7gp5wc9d";
-        libName = "build";
-        authors = [
-          "Peter Atashian <retep998@gmail.com>"
-        ];
-        
-      };
-      "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "winapi-i686-pc-windows-gnu";
-        version = "0.4.0";
-        edition = "2015";
-        sha256 = "1dmpa6mvcvzz16zg6d5vrfy4bxgg541wxrcip7cnshi06v38ffxc";
-        authors = [
-          "Peter Atashian <retep998@gmail.com>"
-        ];
-        
-      };
-      "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "winapi-x86_64-pc-windows-gnu";
-        version = "0.4.0";
-        edition = "2015";
-        sha256 = "0gqq64czqb64kskjryj8isp62m2sgvx25yyj3kpc2myh85w24bki";
-        authors = [
-          "Peter Atashian <retep998@gmail.com>"
-        ];
-        
-      };
-      "winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "winreg";
-        version = "0.6.2";
-        edition = "2015";
-        sha256 = "1jdcqr6zmvwyrp87h48miasfdvv16gjsb60rc8dy2kqwb3mnv65j";
-        authors = [
-          "Igor Shaula <gentoo90@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "winapi";
-            packageId = "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)";
-            features = [ "impl-default" "impl-debug" "minwindef" "minwinbase" "timezoneapi" "winerror" "winnt" "winreg" "handleapi" ];
-          }
-        ];
-        features = {
-          "serialization-serde" = [ "transactions" "serde" ];
-          "transactions" = [ "winapi/ktmw32" ];
-        };
-      };
-      "winutil 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "winutil";
-        version = "0.1.1";
-        edition = "2015";
-        sha256 = "0vkyl3fbbf05n5ph5yz8sfaccrk9x3qsr25560w6w68ldf5i7bvx";
-        authors = [
-          "Dave Lancaster <lancaster.dave@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "winapi";
-            packageId = "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)";
-            target = { target, features }: target."windows";
-            features = [ "wow64apiset" "processthreadsapi" "winbase" ];
-          }
-        ];
-        
-      };
-      "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "ws2_32-sys";
-        version = "0.2.1";
-        edition = "2015";
-        sha256 = "0ppscg5qfqaw0gzwv2a4nhn5bn01ff9iwn6ysqnzm4n8s3myz76m";
-        libName = "ws2_32";
-        authors = [
-          "Peter Atashian <retep998@gmail.com>"
-        ];
-        dependencies = [
-          {
-            name = "winapi";
-            packageId = "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        buildDependencies = [
-          {
-            name = "winapi-build";
-            packageId = "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        
-      };
-      "yaml-rust 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = rec {
-        crateName = "yaml-rust";
-        version = "0.4.3";
-        edition = "2015";
-        sha256 = "0ka3qhqc5lvk3hz14wmsj32jhmh44blcbfrx5hfxli2gg38kv4k5";
-        authors = [
-          "Yuheng Chen <yuhengchen@sensetime.com>"
-        ];
-        dependencies = [
-          {
-            name = "linked-hash-map";
-            packageId = "linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)";
-          }
-        ];
-        
-      };
-    };
-
-    #
-# 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. 
-  */
-  crateWithTest = crate: testCrate: testCrateFlags:
-    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;
-        } ''
-          set -ex
-          cd ${crate.src}
-          for file in ${drv}/tests/*; do
-            $file $testCrateFlags 2>&1 | tee -a $out
-          done
-        '';
-    in
-      crate.overrideAttrs (
-        old: {
-          checkPhase = ''
-            test -e ${test}
-          '';
-          passthru = (old.passthru or {}) // {
-            inherit test;
-          };
-        }
-      );
-
-  /* A restricted overridable version of builtRustCratesWithFeatures. */
-  buildRustCrateWithFeatures =
-    { packageId
-    , features ? rootFeatures
-    , crateOverrides ? defaultCrateOverrides
-    , buildRustCrateFunc ? (
-        if crateOverrides == pkgs.defaultCrateOverrides
-        then buildRustCrate
-        else buildRustCrate.override {
-          defaultCrateOverrides = crateOverrides;
-        }
-      )
-    , runTests ? false
-    , testCrateFlags ? []
-    }:
-      lib.makeOverridable
-        (
-          { features, crateOverrides, runTests, testCrateFlags }:
-            let
-              builtRustCrates = builtRustCratesWithFeatures {
-                inherit packageId features buildRustCrateFunc;
-                runTests = false;
-              };
-              builtTestRustCrates = builtRustCratesWithFeatures {
-                inherit packageId features buildRustCrateFunc;
-                runTests = true;
-              };
-              drv = builtRustCrates.${packageId};
-              testDrv = builtTestRustCrates.${packageId};
-            in
-              if runTests then crateWithTest drv testDrv testCrateFlags else drv
-        )
-        { inherit features crateOverrides runTests testCrateFlags; };
-
-  /* Returns an attr set with packageId mapped to the result of buildRustCrateFunc 
-     for the corresponding crate. 
-  */
-  builtRustCratesWithFeatures =
-    { packageId
-    , features
-    , crateConfigs ? crates
-    , buildRustCrateFunc
-    , runTests
-    , target ? defaultTarget
-    } @ args:
-      assert (builtins.isAttrs crateConfigs);
-      assert (builtins.isString packageId);
-      assert (builtins.isList features);
-      assert (builtins.isAttrs target);
-      assert (builtins.isBool runTests);
-
-      let
-        rootPackageId = packageId;
-        mergedFeatures = mergePackageFeatures (
-          args // {
-            inherit rootPackageId;
-            target = target // { test = runTests; };
-          }
-        );
-
-        buildByPackageId = packageId: buildByPackageIdImpl packageId;
-
-        # Memoize built packages so that reappearing packages are only built once.
-        builtByPackageId =
-          lib.mapAttrs (packageId: value: buildByPackageId packageId) crateConfigs;
-
-        buildByPackageIdImpl = packageId:
-          let
-            features = mergedFeatures."${packageId}" or [];
-            crateConfig' = crateConfigs."${packageId}";
-            crateConfig =
-              builtins.removeAttrs crateConfig' [ "resolvedDefaultFeatures" "devDependencies" ];
-            devDependencies =
-              lib.optionals
-                (runTests && packageId == rootPackageId)
-                (crateConfig'.devDependencies or []);
-            dependencies =
-              dependencyDerivations {
-                inherit builtByPackageId features target;
-                dependencies =
-                  (crateConfig.dependencies or [])
-                  ++ devDependencies;
-              };
-            buildDependencies =
-              dependencyDerivations {
-                inherit builtByPackageId features target;
-                dependencies = crateConfig.buildDependencies or [];
-              };
-
-            dependenciesWithRenames =
-              lib.filter (d: d ? "rename") (
-                (crateConfig.buildDependencies or [])
-                ++ (crateConfig.dependencies or [])
-                ++ devDependencies
-              );
-
-            crateRenames =
-              builtins.listToAttrs
-                (map (d: { name = d.name; value = d.rename; }) dependenciesWithRenames);
-          in
-            buildRustCrateFunc (
-              crateConfig // {
-                src = crateConfig.src or (
-                  pkgs.fetchurl {
-                    name = "${crateConfig.crateName}-${crateConfig.version}.tar.gz";
-                    url = "https://crates.io/api/v1/crates/${crateConfig.crateName}/${crateConfig.version}/download";
-                    sha256 = crateConfig.sha256;
-                  }
-                );
-                inherit features dependencies buildDependencies crateRenames;
-              }
-            );
-      in
-        builtByPackageId;
-
-  /* Returns the actual derivations for the given dependencies. */
-  dependencyDerivations =
-    { builtByPackageId
-    , features
-    , dependencies
-    , target
-    }:
-      assert (builtins.isAttrs builtByPackageId);
-      assert (builtins.isList features);
-      assert (builtins.isList dependencies);
-      assert (builtins.isAttrs target);
-
-      let
-        enabledDependencies = filterEnabledDependencies {
-          inherit dependencies features target;
-        };
-        depDerivation = dependency: builtByPackageId.${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 }:
-    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 {
-          features = rootFeatures;
-          inherit packageId;
-        };
-      };
-    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 = "${name}/";
-      len = builtins.stringLength prefix;
-      startsWithPrefix = builtins.substring 0 len feature == prefix;
-    in
-      feature == name
-      || (rename != null && rename == feature)
-      || startsWithPrefix;
-
-  /* Returns the expanded features for the given inputFeatures by applying the
-     rules in featureMap.
-
-     featureMap is an attribute set which maps feature names to lists of further
-     feature names to enable in case this feature is selected.
-  */
-  expandFeatures = featureMap: inputFeatures:
-    assert (builtins.isAttrs featureMap);
-    assert (builtins.isList inputFeatures);
-
-    let
-      expandFeature = feature:
-        assert (builtins.isString feature);
-        [ feature ] ++ (expandFeatures featureMap (featureMap."${feature}" or []));
-      outFeatures = builtins.concatMap expandFeature inputFeatures;
-    in
-      sortedUnique outFeatures;
-
-  /*
-     Returns the actual dependencies 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.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)
-  #
-
-  };
-}