This issue was originally filed by @terrasea

What steps will reproduce the problem?

1. write the dart code
       window.navigator.geolocation.getCurrentPosition((Geoposition position) {
           window.alert(position.coords.latitude.toString());
       });
2. run this through dart2js
3. run the resulting javascript in Firefox

Should see an alert with the latitude displayed in it, instead got a Javascript error

    Error: TypeError: getCurrentPosition$1 is not a function

Firefox version is 16.0.2, Dart Editor version is 0.2.3_r14669 and Dart SDK version is 0.2.3.0_r14669.

OS is Gentoo Linux with mixed masked and unmasked packages, in case that helps.

Please provide any additional information below.