diff --git a/test/libsolidity/syntaxTests/operators/userDefined/implementing_operator_with_privately_overloaded_function.sol b/test/libsolidity/syntaxTests/operators/userDefined/implementing_operator_with_privately_overloaded_function.sol
new file mode 100644
index 000000000..102dfc674
--- /dev/null
+++ b/test/libsolidity/syntaxTests/operators/userDefined/implementing_operator_with_privately_overloaded_function.sol
@@ -0,0 +1,12 @@
+using {L.add as +} for A;
+using {L.add as +} for AP;
+
+library L {
+    function add(A, A) private pure returns (A) {}
+    function add(AP, AP) internal pure returns (AP) {}
+}
+
+type A is address;
+type AP is address payable;
+// ----
+// DeclarationError 7920: (7-12): Identifier not found or not unique.
diff --git a/test/libsolidity/syntaxTests/operators/userDefined/using_for_attaching_functions_and_defining_operators_same_directive.sol b/test/libsolidity/syntaxTests/operators/userDefined/using_for_attaching_functions_and_defining_operators_same_directive.sol
new file mode 100644
index 000000000..9b83faa59
--- /dev/null
+++ b/test/libsolidity/syntaxTests/operators/userDefined/using_for_attaching_functions_and_defining_operators_same_directive.sol
@@ -0,0 +1,10 @@
+type AP is address payable;
+
+function sub(AP, AP) pure returns (AP) {}
+function unsub(AP) pure returns (AP) {}
+
+function attachedPure(AP, uint, address) pure {}
+function attachedView(AP) view {}
+function attached(AP, function(AP)) {}
+
+using {sub as -, attachedPure, attachedView, unsub as -, attached} for AP;