1 files changed, 36 insertions, 0 deletions
diff --git a/tests/ui/inference/need_type_info/type-alias.rs b/tests/ui/inference/need_type_info/type-alias.rs
new file mode 100644
index 000000000..f921b046b
--- /dev/null
+++ b/tests/ui/inference/need_type_info/type-alias.rs
@@ -0,0 +1,36 @@
+// Test the inference errors in case the relevant path
+// uses a type alias.
+//
+// Regression test for #97698.
+struct Ty<T>(T);
+impl<T> Ty<T> {
+    fn new() {}
+}
+
+type DirectAlias<T> = Ty<T>;
+fn direct_alias() {
+    DirectAlias::new()
+    //~^ ERROR type annotations needed
+}
+
+type IndirectAlias<T> = Ty<Box<T>>;
+fn indirect_alias() {
+    IndirectAlias::new();
+    // FIXME: This should also emit an error.
+    //
+    // Added it separately as `type-alias-indirect.rs`
+    // where it does error.
+}
+
+struct TyDefault<T, U = u32>(T, U);
+impl<T> TyDefault<T> {
+    fn new() {}
+}
+
+type DirectButWithDefaultAlias<T> = TyDefault<T>;
+fn direct_but_with_default_alias() {
+    DirectButWithDefaultAlias::new();
+    //~^ ERROR type annotations needed
+}
+
+fn main() {}