feat:exercises

Author: build

exercises/tests/Cargo.lock

@@ -0,0 +1,7 @@
+[package]
+name = "tests7"
+version = "0.0.1"
+edition = "2021"
+[[bin]]
+name = "tests7"
+path = "tests7.rs"

exercises/tests/Cargo.toml

@@ -10,11 +10,11 @@ fn main() {
         .duration_since(std::time::UNIX_EPOCH)
         .unwrap()
         .as_secs(); // What's the use of this timestamp here?
-    let your_command = format!(
-        "Your command here with {}, please checkout exercises/tests/build.rs",
-        timestamp
-    );
+    let your_command = format!("rustc-env=TEST_FOO={}", timestamp);
+
     println!("cargo:{}", your_command);
+    // 告诉 Cargo 当 TEST_FOO 环境变量变化时重新运行构建脚本
+    println!("cargo:rerun-if-env-changed=TEST_FOO");
 
     // In tests8, we should enable "pass" feature to make the
     // testcase return early. Fill in the command to tell

exercises/tests/build.rs

@@ -31,7 +31,7 @@ unsafe fn modify_by_address(address: usize) {
     // comment of the test below as your format reference.
     unsafe {
         let ptr = address as *mut u32;
-        ptr = 0xAABBCCDD;
+        *ptr = 0xAABBCCDD;
     }
 }