1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/closures/closure-referencing-itself-issue-25954.rs b/src/test/ui/closures/closure-referencing-itself-issue-25954.rs
new file mode 100644
index 000000000..7dd0e5179
--- /dev/null
+++ b/src/test/ui/closures/closure-referencing-itself-issue-25954.rs
@@ -0,0 +1,18 @@
+// Regression test for #25954: detect and reject a closure type that
+// references itself.
+
+use std::cell::{Cell, RefCell};
+
+struct A<T: Fn()> {
+    x: RefCell<Option<T>>,
+    b: Cell<i32>,
+}
+
+fn main() {
+    let mut p = A{x: RefCell::new(None), b: Cell::new(4i32)};
+
+    // This is an error about types of infinite size:
+    let q = || p.b.set(5i32); //~ ERROR mismatched types
+
+    *(p.x.borrow_mut()) = Some(q);
+}