1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/incomplete-inference.rs b/src/test/ui/type-alias-impl-trait/incomplete-inference.rs
new file mode 100644
index 000000000..4c8bf2cfc
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/incomplete-inference.rs
@@ -0,0 +1,14 @@
+#![feature(type_alias_impl_trait)]
+
+type Foo = impl Sized;
+
+fn bar() -> Foo {
+    None
+    //~^ ERROR: type annotations needed [E0282]
+}
+
+fn baz() -> Foo {
+    Some(())
+}
+
+fn main() {}