fix issues caught by analysis_server

test/codegen_test.dart

Index: test/codegen_test.dart
diff --git a/test/codegen_test.dart b/test/codegen_test.dart
index dade175694f53a3c4f9a49f781c26845c9518eec..e72dd09405582e107194fe3d2ba7a00960fbcc7e 100644
--- a/test/codegen_test.dart
+++ b/test/codegen_test.dart
@@ -132,8 +132,8 @@ main(arguments) {
         // Get the test SDK. We use a checked in copy so test expectations can
         // be generated against a specific SDK version.
         var testSdk = path.join(testDirectory, '..', 'tool', 'generated_sdk');
-        var result = compile('dart:core', testSdk, checkSdk: true);
-        var outputDir = new Directory(path.join(expectDir, 'core'));
+        compile('dart:core', testSdk, checkSdk: true);
+        new Directory(path.join(expectDir, 'core'));
         var outFile = new File(path.join(expectDir, 'dart/core.js'));
         expect(outFile.existsSync(), true,
             reason: '${outFile.path} was created for dart:core');