fixes #219, able to compile multiple entry points

test/codegen/expect/constructors.txt

Index: test/codegen/expect/constructors.txt
diff --git a/test/codegen/expect/constructors.txt b/test/codegen/expect/constructors.txt
index 99d01f16eae3460aaa1020ab9a76052eed112a3b..2db153990600ef43aa904d46201dc90389ed3c11 100644
--- a/test/codegen/expect/constructors.txt
+++ b/test/codegen/expect/constructors.txt
@@ -1,10 +1,4 @@
 // Messages from compiling constructors.dart
-warning: line 90, column 14 of test/codegen/constructors.dart: [DownCastComposite] y (dynamic) will need runtime check to cast to type T
-  Q(y) : x = y;
-             ^
-info: line 96, column 12 of test/codegen/constructors.dart: [DynamicCast] q.x (dynamic) will need runtime check to cast to type String
-    return q.x;
-           ^^^
-info: line 101, column 12 of test/codegen/constructors.dart: [DynamicCast] q.x (dynamic) will need runtime check to cast to type String
-    return q.x;
-           ^^^
+warning: [DownCastComposite] y (dynamic) will need runtime check to cast to type T (test/codegen/constructors.dart, line 90, col 14)
+info: [DynamicCast] q.x (dynamic) will need runtime check to cast to type String (test/codegen/constructors.dart, line 96, col 12)
+info: [DynamicCast] q.x (dynamic) will need runtime check to cast to type String (test/codegen/constructors.dart, line 101, col 12)