1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/coercion/retslot-cast.stderr b/src/test/ui/coercion/retslot-cast.stderr
new file mode 100644
index 000000000..798ce1199
--- /dev/null
+++ b/src/test/ui/coercion/retslot-cast.stderr
@@ -0,0 +1,15 @@
+error[E0308]: mismatched types
+  --> $DIR/retslot-cast.rs:13:5
+   |
+LL |             -> Option<&Iterator<Item=()>> {
+   |                -------------------------- expected `Option<&dyn Iterator<Item = ()>>` because of return type
+...
+LL |     inner(x)
+   |     ^^^^^^^^ expected trait `Iterator<Item = ()>`, found trait `Iterator<Item = ()> + Send`
+   |
+   = note: expected enum `Option<&dyn Iterator<Item = ()>>`
+              found enum `Option<&dyn Iterator<Item = ()> + Send>`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.