1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/inference/cannot-infer-async.rs b/src/test/ui/inference/cannot-infer-async.rs
new file mode 100644
index 000000000..e7fabd0ff
--- /dev/null
+++ b/src/test/ui/inference/cannot-infer-async.rs
@@ -0,0 +1,15 @@
+// edition:2018
+
+use std::io::Error;
+
+fn make_unit() -> Result<(), Error> {
+    Ok(())
+}
+
+fn main() {
+    let fut = async {
+        make_unit()?;
+
+        Ok(()) //~ ERROR type annotations needed
+    };
+}