Compiling non-trivial code results in umbrella exception

[ghost]

Attempting to compile some of our scala code works fine in DevMode, but results in UmbrellaException when compiled to javascript.

Compiling and running the following fork of the hello world project gives four buttons C, D, E and F
C and D work in both dev mode and javascript
E and F work in dev mode but fail in javascript

git://github.com/kubuskowalski/scalagwt-sample.git

PS fantastic work, we're watching this closely as we'd love to have our scala code running in the browser..

[anovstrup]

https://github.com/kubuskowalski/scalagwt-sample