1 files changed, 21 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-30438-c.rs b/src/test/ui/issues/issue-30438-c.rs
new file mode 100644
index 000000000..4cf634245
--- /dev/null
+++ b/src/test/ui/issues/issue-30438-c.rs
@@ -0,0 +1,21 @@
+// Simplified regression test for #30438, inspired by arielb1.
+
+trait Trait { type Out; }
+
+struct Test<'a> { s: &'a str }
+
+fn silly<'y, 'z>(_s: &'y Test<'z>) -> &'y <Test<'z> as Trait>::Out where 'z: 'static {
+    //~^ WARN unnecessary lifetime parameter `'z`
+    let x = Test { s: "this cannot last" };
+    &x
+    //~^ ERROR: cannot return reference to local variable `x`
+}
+
+impl<'b> Trait for Test<'b> { type Out = Test<'b>; }
+
+fn main() {
+    let orig = Test { s: "Hello World" };
+    let r = silly(&orig);
+    println!("{}", orig.s); // OK since `orig` is valid
+    println!("{}", r.s); // Segfault (method does not return a sane value)
+}