Add ui test for issue 51301

2 files changed, 47 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-51301.rs b/src/test/ui/issues/issue-51301.rs
new file mode 100644
index 00000000000..7e0a5190fcd
--- /dev/null
+++ b/src/test/ui/issues/issue-51301.rs
@@ -0,0 +1,35 @@
+use std::any::TypeId;
+use std::collections::HashMap;
+use std::hash::Hash;
+
+trait State {
+    type EventType;
+    fn get_type_id_of_state(&self) -> TypeId;
+}
+
+struct StateMachine<EventType: Hash + Eq> {
+    current_state: Box<dyn State<EventType = EventType>>,
+    transition_table:
+        HashMap<TypeId, HashMap<EventType, fn() -> Box<dyn State<EventType = EventType>>>>,
+}
+
+impl<EventType: Hash + Eq> StateMachine<EventType> {
+    fn inner_process_event(&mut self, event: EventType) -> Result<(), i8> {
+        let new_state_creation_function = self
+            .transition_table
+            .iter()
+            .find(|(&event_typeid, _)| event_typeid == self.current_state.get_type_id_of_state())
+            .ok_or(1)?
+            .1
+            .iter()
+            .find(|(&event_type, _)| event == event_type)
+            //~^ ERROR cannot move out of a shared reference
+            .ok_or(2)?
+            .1;
+
+        self.current_state = new_state_creation_function();
+        Ok(())
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/issues/issue-51301.stderr b/src/test/ui/issues/issue-51301.stderr
new file mode 100644
index 00000000000..f3decf7a991
--- /dev/null
+++ b/src/test/ui/issues/issue-51301.stderr
@@ -0,0 +1,12 @@
+error[E0507]: cannot move out of a shared reference
+  --> $DIR/issue-51301.rs:25:20
+   |
+LL |             .find(|(&event_type, _)| event == event_type)
+   |                    ^^----------^^^^
+   |                      |
+   |                      data moved here
+   |                      move occurs because `event_type` has type `EventType`, which does not implement the `Copy` trait
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0507`.