1 files changed, 16 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-17431-6.stderr b/src/test/ui/issues/issue-17431-6.stderr
new file mode 100644
index 000000000..fcac420b2
--- /dev/null
+++ b/src/test/ui/issues/issue-17431-6.stderr
@@ -0,0 +1,16 @@
+error[E0072]: recursive type `Foo` has infinite size
+  --> $DIR/issue-17431-6.rs:3:1
+   |
+LL | enum Foo { X(Mutex<Option<Foo>>) }
+   | ^^^^^^^^     ------------------ recursive without indirection
+   | |
+   | recursive type has infinite size
+   |
+help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to make `Foo` representable
+   |
+LL | enum Foo { X(Box<Mutex<Option<Foo>>>) }
+   |              ++++                  +
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0072`.