Add compile_fail to let_underscore_drop example

saschanaz · web-flow · commit 2484a1823999 · 2022-10-24T17:25:30.000+02:00
diff --git a/compiler/rustc_lint/src/let_underscore.rs b/compiler/rustc_lint/src/let_underscore.rs
@@ -11,7 +11,7 @@ declare_lint! {
     /// scope.
     ///
     /// ### Example
-    /// ```
+    /// ```compile_fail
     /// struct SomeStruct;
     /// impl Drop for SomeStruct {
     ///     fn drop(&mut self) {
