User-defined operators: Tests

test/libsolidity/syntaxTests/controlFlow/userDefinedOperators/binary_operator_udvt.sol

@@ -0,0 +1,17 @@
+type X is uint24;
+type Y is uint16;
+
+using {addX as +} for X global;
+using {addY as +} for Y global;
+
+function addX(X, X) pure returns (X) {}
+function addY(Y, Y) pure returns (Y) { revert(); }
+
+contract C {
+    function f() public pure {
+        X.wrap(1) + X.wrap(Y.unwrap(Y.wrap(2) + Y.wrap(3)));
+        X.wrap(4) + X.wrap(5); // Unreachable
+    }
+}
+// ----
+// Warning 5740: (307-328): Unreachable code.

test/libsolidity/syntaxTests/controlFlow/userDefinedOperators/unary_operator_udvt.sol

@@ -0,0 +1,17 @@
+type X is uint24;
+type Y is uint16;
+
+using {unsubX as -} for X global;
+using {unsubY as -} for Y global;
+
+function unsubX(X) pure returns (X) {}
+function unsubY(Y) pure returns (Y) { revert(); }
+
+contract C {
+    function f() public pure {
+        -X.wrap(Y.unwrap(-Y.wrap(1)));
+        -X.wrap(Y.unwrap(Y.wrap(2))); // Unreachable
+    }
+}
+// ----
+// Warning 5740: (287-315): Unreachable code.