Check for duplicate library names

test/codegen/expect/sunflower/painter.js

Index: test/codegen/expect/sunflower/painter.js
diff --git a/test/codegen/expect/sunflower/painter.js b/test/codegen/expect/sunflower/painter.js
index 0877e7306bb61169c202e0388c6bdd9186d6b7cb..81b9ac1d7864166b85185281f7e7e9330088be28 100644
--- a/test/codegen/expect/sunflower/painter.js
+++ b/test/codegen/expect/sunflower/painter.js
@@ -1,9 +1,10 @@
-var painter = dart.defineLibrary(painter, {});
-var math = dart.import(math);
-var dom = dart.import(dom);
-var core = dart.import(core);
-var circle = dart.import(circle);
-(function(exports, math, dom, core, circle) {
+dart.library('painter', null, /* Imports */[
+  'dart/math',
+  'dom',
+  'dart/core',
+  'circle'
+], /* Lazy imports */[
+], function(exports, math, dom, core, circle) {
   'use strict';
   let ORANGE = "orange";
   let RED = "red";
@@ -47,4 +48,4 @@ var circle = dart.import(circle);
   exports.TAU = TAU;
   exports.querySelector = querySelector;
   exports.CirclePainter = CirclePainter;
-})(painter, math, dom, core, circle);
+});