1 files changed, 30 insertions, 0 deletions
diff --git a/tests/rustdoc/auxiliary/issue-20727.rs b/tests/rustdoc/auxiliary/issue-20727.rs
new file mode 100644
index 00000000000..7ffc1985b05
--- /dev/null
+++ b/tests/rustdoc/auxiliary/issue-20727.rs
@@ -0,0 +1,30 @@
+// compile-flags: -Cmetadata=aux
+
+pub trait Deref {
+    type Target: ?Sized;
+
+    fn deref<'a>(&'a self) -> &'a Self::Target;
+}
+
+pub trait Add<RHS = Self> {
+    type Output;
+
+    fn add(self, rhs: RHS) -> Self::Output;
+}
+
+
+pub trait Bar {}
+pub trait Deref2 {
+    type Target: Bar;
+
+    fn deref(&self) -> Self::Target;
+}
+
+pub trait Index<Idx: ?Sized> {
+    type Output: ?Sized;
+    fn index(&self, index: Idx) -> &Self::Output;
+}
+
+pub trait IndexMut<Idx: ?Sized>: Index<Idx> {
+    fn index_mut(&mut self, index: Idx) -> &mut Self::Output;
+}