diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 000332a..3997edf 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,6 +21,8 @@ jobs:
         run: |
           cd code
           cargo fmt --all -- --check
+          cd ../ch02-03
+          cargo fmt --all -- --check
 #        uses: actions-rs/cargo@v1
 #        with:
 #          command: fmt
@@ -29,6 +31,8 @@ jobs:
         run: |
           cd code
           cargo clippy
+          cd ../ch02-03
+          cargo clippy
 #        uses: actions-rs/cargo@v1
 #        with:
 #          command: clippy
@@ -50,10 +54,11 @@ jobs:
         run: |
           cd code
           cargo build
+          cd ../ch02-03
+          cargo build
 #        uses: actions-rs/cargo@v1
 #        with:
 #          command: build  
-
   test:
     runs-on: ${{ matrix.os }}
     strategy:
@@ -72,3 +77,5 @@ jobs:
         run: |
           cd code
           cargo test
+          cd ../ch02-03
+          cargo test
diff --git a/code/Cargo.toml b/code/Cargo.toml
index 94ab6b8..4d425da 100644
--- a/code/Cargo.toml
+++ b/code/Cargo.toml
@@ -4,5 +4,5 @@ members = [
     "ch01-02",
     "ch01-03",
     "ch02-02",
-    "ch02-03",
+#    "ch02-03",
 ]
diff --git a/code/ch01-03/src/object/handle.rs b/code/ch01-03/src/object/handle.rs
index 592282d..58a0b47 100644
--- a/code/ch01-03/src/object/handle.rs
+++ b/code/ch01-03/src/object/handle.rs
@@ -1,5 +1,5 @@
 // ANCHOR: handle
-use super::{DummyObject, KernelObject, Rights};
+use super::{KernelObject, Rights};
 use alloc::sync::Arc;
 
 /// 内核对象句柄