fixes #219, able to compile multiple entry points

test/codegen/expect/expect.js

Index: test/codegen/expect/expect.js
diff --git a/test/codegen/expect/expect.js b/test/codegen/expect/expect.js
index ff5e1d1deb8fb281eeadad6489cbb8823b663c6f..f29ab5516078c73bea2a12eded2e0237b0e6f926 100644
--- a/test/codegen/expect/expect.js
+++ b/test/codegen/expect/expect.js
@@ -66,7 +66,7 @@ dart_library.library('expect', null, /* Imports */[
         return;
       let msg = Expect._getMessage(reason);
       if (typeof expected == 'string' && typeof actual == 'string') {
-        let stringDifference = Expect._stringDifference(dart.as(expected, core.String), dart.as(actual, core.String));
+        let stringDifference = Expect._stringDifference(dart.as(dart.as(dart.as(expected, core.String), core.String), core.String), dart.as(dart.as(dart.as(actual, core.String), core.String), core.String));

[Jennifer Messerly, 2015/07/15 21:45:15]

Eeeeep. We appear to be mutating the AST. Investigating...

[Jennifer Messerly, 2015/07/15 22:31:35]

aha, so this is the problem we knew we were going to hit if we reuse the same
analysis context, CoercionReifier mutates the AST. We're generating expect.dart
twice because codegen_test fires up two BatchCompilers on the same analysis
context.

this is super tricky to actually fix =| ... AstCloner doesn't work because we
lose attachment to the element model. I'm probably going to put in a hack for
the short term, since the bug already existed.

         if (stringDifference != null) {
           Expect._fail(`Expect.equals(${stringDifference}${msg}) fails.`);
         }