1 files changed, 8 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-17431-6.rs b/tests/ui/issues/issue-17431-6.rs
new file mode 100644
index 000000000..b7e49873d
--- /dev/null
+++ b/tests/ui/issues/issue-17431-6.rs
@@ -0,0 +1,8 @@
+use std::sync::Mutex;
+
+enum Foo { X(Mutex<Option<Foo>>) }
+//~^ ERROR recursive type `Foo` has infinite size
+
+impl Foo { fn bar(self) {} }
+
+fn main() {}