I think there's already another bug on file for the analyzer issue. If not, I'll file one.

cc @johnniwinther.
cc @peter-ahe-google.
Added this to the M2 milestone.
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Changed the title to: "dart2js: re-export of package imported from pub is failing ("out of order")".

I cannot reproduce this problem. You can help us a great deal if you include a complete example when you report errors.

I suspect that you have a "part" (or "#source") directive before line 22. If I modify http://code.google.com/p/dartbox2d/source/browse/example/demos/BallCage.dart to have this sequence of directives:

library BallCage;

import 'dart:html';
import 'package:box2d/box2d_browser.dart';

export 'package:box2d/box2d.dart';

part 'demo.dart';

It seems to work fine. However, if I change the order of part and export like this:

library BallCage;

import 'dart:html';
import 'package:box2d/box2d_browser.dart';

part 'demo.dart';

export 'package:box2d/box2d.dart';

I get this error:

BallCage.dart:22:1: Error: out of order
export 'package:box2d/box2d.dart';
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This is to be expected as the specification requires that parts come after imports and exports:

libraryDefinition:
     libraryName importOrExport* partDirective* topLevelDefinition*
     ;

Set owner to @peter-ahe-google.
Added CannotReproduce label.

Filed issue #6125 for the analyzer.

This comment was originally written by domi...@google.com

Looks like that's exactly what it was, but the error message I was getting was not suggestive of the problem.

Changed this bug to be about renaming the error message.

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Changed the title to: "Improve error message for out-of-order library tags".

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This was probably fixed a while ago. The current error message looks like this:

Error: Export declarations should come before parts.
Try moving this export further up in the file.
export 'package:box2d/box2d.dart';
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Added Fixed label.