fixes #219, able to compile multiple entry points

test/codegen/expect/expect.txt

Index: test/codegen/expect/expect.txt
diff --git a/test/codegen/expect/expect.txt b/test/codegen/expect/expect.txt
index 7170a0bae4250c14b5dfef9d6ce7d16fc39e1eef..61d81ee10dba79d75d151e6e0480963353cc7d6a 100644
--- a/test/codegen/expect/expect.txt
+++ b/test/codegen/expect/expect.txt
@@ -1,10 +1,4 @@
 // Messages from compiling expect.dart
-info: line 97, column 51 of test/codegen/expect.dart: [DynamicCast] expected (dynamic) will need runtime check to cast to type String
-      String stringDifference = _stringDifference(expected, actual);
-                                                  ^^^^^^^^
-info: line 97, column 61 of test/codegen/expect.dart: [DynamicCast] actual (dynamic) will need runtime check to cast to type String
-      String stringDifference = _stringDifference(expected, actual);
-                                                            ^^^^^^
-info: line 372, column 14 of test/codegen/expect.dart: [DynamicInvoke] check(e) requires dynamic invoke
-        if (!check(e)) {
-             ^^^^^^^^
+info: [DynamicCast] expected (dynamic) will need runtime check to cast to type String (test/codegen/expect.dart, line 97, col 51)
+info: [DynamicCast] actual (dynamic) will need runtime check to cast to type String (test/codegen/expect.dart, line 97, col 61)
+info: [DynamicInvoke] check(e) requires dynamic invoke (test/codegen/expect.dart, line 372, col 14)