1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/recursion/issue-38591-non-regular-dropck-recursion.rs b/tests/ui/recursion/issue-38591-non-regular-dropck-recursion.rs
new file mode 100644
index 000000000..c9e93174e
--- /dev/null
+++ b/tests/ui/recursion/issue-38591-non-regular-dropck-recursion.rs
@@ -0,0 +1,16 @@
+// `S` is infinitely recursing so it's not possible to generate a finite
+// drop impl (ignoring polymorphization).
+//
+// Dropck should therefore detect that this is the case and eagerly error.
+
+struct S<T> {
+    t: T,
+    s: Box<S<fn(u: T)>>,
+}
+
+fn f(x: S<u32>) {} //~ ERROR overflow while adding drop-check rules for S<u32>
+
+fn main() {
+    // Force instantiation.
+    f as fn(_);
+}