1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/multiple-lifetimes/error-handling-2.rs b/tests/ui/impl-trait/multiple-lifetimes/error-handling-2.rs
new file mode 100644
index 00000000000..2a2be6b7429
--- /dev/null
+++ b/tests/ui/impl-trait/multiple-lifetimes/error-handling-2.rs
@@ -0,0 +1,26 @@
+#![feature(type_alias_impl_trait)]
+
+#[derive(Clone)]
+struct CopyIfEq<T, U>(T, U);
+
+impl<T: Copy> Copy for CopyIfEq<T, T> {}
+
+type E<'a, 'b> = impl Sized;
+
+fn foo<'a: 'b, 'b, 'c>(x: &'static i32, mut y: &'a i32) -> E<'b, 'c> {
+    let v = CopyIfEq::<*mut _, *mut _>(&mut { x }, &mut y);
+
+    // This assignment requires that `x` and `y` have the same type due to the
+    // `Copy` impl. The reason why we are using a copy to create a constraint
+    // is that only borrow checking (not regionck in type checking) enforces
+    // this bound.
+    let u = v;
+    let _: *mut &'a i32 = u.1;
+    unsafe {
+        let _: &'b i32 = *u.0;
+    }
+    u.0
+    //~^ ERROR hidden type for `E<'b, 'c>` captures lifetime that does not appear in bounds
+}
+
+fn main() {}