fix bug

刘丰源 · 刘丰源 · commit 01d2e36b0138 · 2020-02-13T13:00:52.000+08:00
diff --git a/os/src/process/structs.rs b/os/src/process/structs.rs
@@ -22,7 +22,6 @@ pub enum Status {
     Exited(ExitCode),
 }
 
-#[derive(Clone)]
 pub struct Thread {
     pub context: Context,
     pub kstack: KernelStack,
