1 files changed, 29 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/hidden-lifetimes.stderr b/tests/ui/impl-trait/hidden-lifetimes.stderr
new file mode 100644
index 000000000..3cc47e1e8
--- /dev/null
+++ b/tests/ui/impl-trait/hidden-lifetimes.stderr
@@ -0,0 +1,29 @@
+error[E0700]: hidden type for `impl Swap + 'a` captures lifetime that does not appear in bounds
+  --> $DIR/hidden-lifetimes.rs:29:5
+   |
+LL | fn hide_ref<'a, 'b, T: 'static>(x: &'a mut &'b T) -> impl Swap + 'a {
+   |                 -- hidden type `&'a mut &'b T` captures the lifetime `'b` as defined here
+LL |     x
+   |     ^
+   |
+help: to declare that `impl Swap + 'a` captures `'b`, you can add an explicit `'b` lifetime bound
+   |
+LL | fn hide_ref<'a, 'b, T: 'static>(x: &'a mut &'b T) -> impl Swap + 'a + 'b {
+   |                                                                     ++++
+
+error[E0700]: hidden type for `impl Swap + 'a` captures lifetime that does not appear in bounds
+  --> $DIR/hidden-lifetimes.rs:46:5
+   |
+LL | fn hide_rc_refcell<'a, 'b: 'a, T: 'static>(x: Rc<RefCell<&'b T>>) -> impl Swap + 'a {
+   |                        -- hidden type `Rc<RefCell<&'b T>>` captures the lifetime `'b` as defined here
+LL |     x
+   |     ^
+   |
+help: to declare that `impl Swap + 'a` captures `'b`, you can add an explicit `'b` lifetime bound
+   |
+LL | fn hide_rc_refcell<'a, 'b: 'a, T: 'static>(x: Rc<RefCell<&'b T>>) -> impl Swap + 'a + 'b {
+   |                                                                                     ++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0700`.