1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/inference/cannot-infer-async.rs b/tests/ui/inference/cannot-infer-async.rs
new file mode 100644
index 00000000000..b5152d04f69
--- /dev/null
+++ b/tests/ui/inference/cannot-infer-async.rs
@@ -0,0 +1,16 @@
+// edition:2018
+
+use std::io::Error;
+
+fn make_unit() -> Result<(), Error> {
+    Ok(())
+}
+
+fn main() {
+    let fut = async {
+        make_unit()?;
+
+        Ok(())
+        //~^ ERROR type annotations needed
+    };
+}