runtime: mark EnterGuard with must_use (#3609)

tokio-rs · Mar 12, 2021 · a1b4bde · a1b4bde
1 parent edfff75
commit a1b4bde
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs
@@ -39,6 +39,7 @@ pub struct Handle {
 ///
 /// [`Runtime::enter`]: fn@crate::runtime::Runtime::enter
 #[derive(Debug)]
+#[must_use = "Creating and dropping a guard does nothing"]
 pub struct EnterGuard<'a> {
  handle: &'a Handle,
  guard: context::EnterGuard,