2 files changed, 30 insertions, 1 deletions
diff --git a/tests/ui/len_without_is_empty.rs b/tests/ui/len_without_is_empty.rs
index ac6c3e06365..d623601110e 100644
--- a/tests/ui/len_without_is_empty.rs
+++ b/tests/ui/len_without_is_empty.rs
@@ -436,4 +436,27 @@ impl DifferingErrors {
     }
 }
 
+// Issue #11165
+pub struct Aliased1;
+pub type Alias1 = Aliased1;
+
+impl Alias1 {
+    pub fn len(&self) -> usize {
+        todo!()
+    }
+
+    pub fn is_empty(&self) -> bool {
+        todo!()
+    }
+}
+
+pub struct Aliased2;
+pub type Alias2 = Aliased2;
+impl Alias2 {
+    pub fn len(&self) -> usize {
+        //~^ ERROR: type `Alias2` has a public `len` method, but no `is_empty` method
+        todo!()
+    }
+}
+
 fn main() {}
diff --git a/tests/ui/len_without_is_empty.stderr b/tests/ui/len_without_is_empty.stderr
index 4815ce6a04b..8e51c28b330 100644
--- a/tests/ui/len_without_is_empty.stderr
+++ b/tests/ui/len_without_is_empty.stderr
@@ -141,5 +141,11 @@ error: struct `AsyncResultLenWithoutIsEmpty` has a public `len` method, but no `
 LL |     pub async fn len(&self) -> Result<usize, ()> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 15 previous errors
+error: type `Alias2` has a public `len` method, but no `is_empty` method
+  --> $DIR/len_without_is_empty.rs:456:5
+   |
+LL |     pub fn len(&self) -> usize {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 16 previous errors