Extend using-for.

test/libsolidity/syntaxTests/using/module_2.sol

@@ -0,0 +1,14 @@
+==== Source: A ====
+function id(uint x) pure returns (uint) {
+    return x;
+}
+
+==== Source: B ====
+import {id as Id} from "A";
+
+contract C {
+    using { Id } for uint;
+	function f(uint x) public pure returns (uint) {
+        return x.Id();
+    }
+}