1 files changed, 23 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-39970.stderr b/tests/ui/issues/issue-39970.stderr
new file mode 100644
index 000000000..0cabdf7f2
--- /dev/null
+++ b/tests/ui/issues/issue-39970.stderr
@@ -0,0 +1,23 @@
+error[E0271]: type mismatch resolving `for<'a> <() as Array<'a>>::Element == ()`
+  --> $DIR/issue-39970.rs:19:5
+   |
+LL |     <() as Visit>::visit();
+   |     ^^^^^^^^^^^^^^^^^^^^ type mismatch resolving `for<'a> <() as Array<'a>>::Element == ()`
+   |
+note: expected this to be `()`
+  --> $DIR/issue-39970.rs:10:20
+   |
+LL |     type Element = &'a ();
+   |                    ^^^^^^
+note: required for `()` to implement `Visit`
+  --> $DIR/issue-39970.rs:13:6
+   |
+LL | impl Visit for () where
+   |      ^^^^^     ^^
+LL |     //(): for<'a> Array<'a, Element=&'a ()>, // No ICE
+LL |     (): for<'a> Array<'a, Element=()>, // ICE
+   |                           ---------- unsatisfied trait bound introduced here
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0271`.