1 files changed, 89 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/auto-trait-leak.stderr b/src/test/ui/impl-trait/auto-trait-leak.stderr
new file mode 100644
index 000000000..634ff1486
--- /dev/null
+++ b/src/test/ui/impl-trait/auto-trait-leak.stderr
@@ -0,0 +1,89 @@
+error[E0391]: cycle detected when computing type of `cycle1::{opaque#0}`
+  --> $DIR/auto-trait-leak.rs:12:16
+   |
+LL | fn cycle1() -> impl Clone {
+   |                ^^^^^^^^^^
+   |
+note: ...which requires borrow-checking `cycle1`...
+  --> $DIR/auto-trait-leak.rs:12:1
+   |
+LL | fn cycle1() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires processing `cycle1`...
+  --> $DIR/auto-trait-leak.rs:12:1
+   |
+LL | fn cycle1() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires processing MIR for `cycle1`...
+  --> $DIR/auto-trait-leak.rs:12:1
+   |
+LL | fn cycle1() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires unsafety-checking `cycle1`...
+  --> $DIR/auto-trait-leak.rs:12:1
+   |
+LL | fn cycle1() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires building MIR for `cycle1`...
+  --> $DIR/auto-trait-leak.rs:12:1
+   |
+LL | fn cycle1() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires type-checking `cycle1`...
+  --> $DIR/auto-trait-leak.rs:14:5
+   |
+LL |     send(cycle2().clone());
+   |     ^^^^
+   = note: ...which requires evaluating trait selection obligation `impl core::clone::Clone: core::marker::Send`...
+note: ...which requires computing type of `cycle2::{opaque#0}`...
+  --> $DIR/auto-trait-leak.rs:19:16
+   |
+LL | fn cycle2() -> impl Clone {
+   |                ^^^^^^^^^^
+note: ...which requires borrow-checking `cycle2`...
+  --> $DIR/auto-trait-leak.rs:19:1
+   |
+LL | fn cycle2() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires processing `cycle2`...
+  --> $DIR/auto-trait-leak.rs:19:1
+   |
+LL | fn cycle2() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires processing MIR for `cycle2`...
+  --> $DIR/auto-trait-leak.rs:19:1
+   |
+LL | fn cycle2() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires unsafety-checking `cycle2`...
+  --> $DIR/auto-trait-leak.rs:19:1
+   |
+LL | fn cycle2() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires building MIR for `cycle2`...
+  --> $DIR/auto-trait-leak.rs:19:1
+   |
+LL | fn cycle2() -> impl Clone {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+note: ...which requires type-checking `cycle2`...
+  --> $DIR/auto-trait-leak.rs:20:5
+   |
+LL |     send(cycle1().clone());
+   |     ^^^^
+   = note: ...which requires evaluating trait selection obligation `impl core::clone::Clone: core::marker::Send`...
+   = note: ...which again requires computing type of `cycle1::{opaque#0}`, completing the cycle
+note: cycle used when checking item types in top-level module
+  --> $DIR/auto-trait-leak.rs:1:1
+   |
+LL | / use std::cell::Cell;
+LL | | use std::rc::Rc;
+LL | |
+LL | | fn send<T: Send>(_: T) {}
+...  |
+LL | |     Rc::new(String::from("foo"))
+LL | | }
+   | |_^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0391`.