diff --git a/embassy-executor/tests/ui.rs b/embassy-executor/tests/ui.rs
index be4679485..278a4b903 100644
--- a/embassy-executor/tests/ui.rs
+++ b/embassy-executor/tests/ui.rs
@@ -19,5 +19,6 @@ fn ui() {
     t.compile_fail("tests/ui/not_async.rs");
     t.compile_fail("tests/ui/self_ref.rs");
     t.compile_fail("tests/ui/self.rs");
+    t.compile_fail("tests/ui/type_error.rs");
     t.compile_fail("tests/ui/where_clause.rs");
 }
diff --git a/embassy-executor/tests/ui/type_error.rs b/embassy-executor/tests/ui/type_error.rs
new file mode 100644
index 000000000..1734bc6c4
--- /dev/null
+++ b/embassy-executor/tests/ui/type_error.rs
@@ -0,0 +1,8 @@
+#![cfg_attr(feature = "nightly", feature(impl_trait_in_assoc_type))]
+
+#[embassy_executor::task]
+async fn task() {
+    5
+}
+
+fn main() {}
diff --git a/embassy-executor/tests/ui/type_error.stderr b/embassy-executor/tests/ui/type_error.stderr
new file mode 100644
index 000000000..bce315811
--- /dev/null
+++ b/embassy-executor/tests/ui/type_error.stderr
@@ -0,0 +1,7 @@
+error[E0308]: mismatched types
+ --> tests/ui/type_error.rs:5:5
+  |
+4 | async fn task() {
+  |                - help: try adding a return type: `-> i32`
+5 |     5
+  |     ^ expected `()`, found integer