checkin part 2 solution

Signed-off-by: Alex Chi <iskyzh@gmail.com>

Cargo.lock

@@ -2,12 +2,6 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "Inflector"
-version = "0.11.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
-
 [[package]]
 name = "aliasable"
 version = "0.1.3"
@@ -420,8 +414,9 @@ dependencies = [
  "crossbeam-channel",
  "crossbeam-epoch",
  "crossbeam-skiplist",
+ "farmhash",
  "moka",
- "ouroboros 0.15.5",
+ "ouroboros",
  "parking_lot",
  "rand",
  "serde",
@@ -442,7 +437,7 @@ dependencies = [
  "crossbeam-skiplist",
  "farmhash",
  "moka",
- "ouroboros 0.18.2",
+ "ouroboros",
  "parking_lot",
  "rand",
  "serde",
@@ -509,16 +504,6 @@ dependencies = [
  "windows-sys 0.42.0",
 ]
 
-[[package]]
-name = "ouroboros"
-version = "0.15.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dfbb50b356159620db6ac971c6d5c9ab788c9cc38a6f49619fca2a27acb062ca"
-dependencies = [
- "aliasable",
- "ouroboros_macro 0.15.5",
-]
-
 [[package]]
 name = "ouroboros"
 version = "0.18.2"
@@ -526,23 +511,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a50b637ffd883b2733a8483599fb6136b9dcedaa1850f7ac08b9b6f9f2061208"
 dependencies = [
  "aliasable",
- "ouroboros_macro 0.18.2",
+ "ouroboros_macro",
  "static_assertions",
 ]
 
-[[package]]
-name = "ouroboros_macro"
-version = "0.15.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4a0d9d1a6191c4f391f87219d1ea42b23f09ee84d64763cd05ee6ea88d9f384d"
-dependencies = [
- "Inflector",
- "proc-macro-error",
- "proc-macro2",
- "quote",
- "syn 1.0.107",
-]
-
 [[package]]
 name = "ouroboros_macro"
 version = "0.18.2"
@@ -586,30 +558,6 @@ version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
-[[package]]
-name = "proc-macro-error"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
-dependencies = [
- "proc-macro-error-attr",
- "proc-macro2",
- "quote",
- "syn 1.0.107",
- "version_check",
-]
-
-[[package]]
-name = "proc-macro-error-attr"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
-dependencies = [
- "proc-macro2",
- "quote",
- "version_check",
-]
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.76"