1 files changed, 54 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-41696.rs b/tests/ui/issues/issue-41696.rs
new file mode 100644
index 00000000000..d094f71942f
--- /dev/null
+++ b/tests/ui/issues/issue-41696.rs
@@ -0,0 +1,54 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(unused_variables)]
+#![recursion_limit = "128"]
+// this used to cause exponential code-size blowup during LLVM passes.
+
+#![feature(test)]
+
+extern crate test;
+
+struct MayUnwind;
+
+impl Drop for MayUnwind {
+    fn drop(&mut self) {
+        if test::black_box(false) {
+            panic!()
+        }
+    }
+}
+
+struct DS<U> {
+    may_unwind: MayUnwind,
+    name: String,
+    next: U,
+}
+
+fn add<U>(ds: DS<U>, name: String) -> DS<DS<U>> {
+    DS {
+        may_unwind: MayUnwind,
+        name: "?".to_owned(),
+        next: ds,
+    }
+}
+
+fn main() {
+    let deserializers = DS { may_unwind: MayUnwind, name: "?".to_owned(), next: () };
+    let deserializers = add(deserializers, "?".to_owned());
+    let deserializers = add(deserializers, "?".to_owned());
+    let deserializers = add(deserializers, "?".to_owned());
+    let deserializers = add(deserializers, "?".to_owned());
+    let deserializers = add(deserializers, "?".to_owned());
+    let deserializers = add(deserializers, "?".to_owned());
+    let deserializers = add(deserializers, "?".to_owned()); // 0.7s
+    let deserializers = add(deserializers, "?".to_owned()); // 1.3s
+    let deserializers = add(deserializers, "?".to_owned()); // 2.4s
+    let deserializers = add(deserializers, "?".to_owned()); // 6.7s
+    let deserializers = add(deserializers, "?".to_owned()); // 26.0s
+    let deserializers = add(deserializers, "?".to_owned()); // 114.0s
+    let deserializers = add(deserializers, "?".to_owned()); // 228.0s
+    let deserializers = add(deserializers, "?".to_owned()); // 400.0s
+    let deserializers = add(deserializers, "?".to_owned()); // 800.0s
+    let deserializers = add(deserializers, "?".to_owned()); // 1600.0s
+    let deserializers = add(deserializers, "?".to_owned()); // 3200.0s
+}