Why does it not compile?

src/modules/package/apt.rs

@@ -0,0 +1,34 @@
+use crate::utils::cmd::Cmd;
+
+use super::{PackageError, PackageList, SpecificPackageManager};
+
+#[derive(Debug)]
+pub struct DebianPackageManager;
+
+impl SpecificPackageManager for DebianPackageManager {
+    fn name(&self) -> &'static str {
+        "apt"
+    }
+    
+    fn update(&self) -> Result<(), PackageError> {
+        let res = Cmd::new("apt").arg("update").run()?;
+
+        if ! res.success {
+            return Err(PackageError::CmdFail(res));
+        }
+        Ok(())
+    }
+
+    fn install(&self, list: PackageList) -> Result<(), PackageError> {
+        let res = Cmd::new("apt").arg("install").args(list.list()).run()?;
+  
+        if ! res.success {
+            return Err(PackageError::CmdFail(res));
+        }
+        Ok(())
+    }
+
+    fn remove(&self, _list: PackageList) -> Result<(), PackageError> {
+        todo!()
+    }
+}