See https://travis-ci.org/angular/angular/jobs/76361788#L1052

Build error:
Transform InjectorGenerator on benchmarks_external|web/src/naive_infinite_scroll/index.dart threw error: <rethrow>
Caused by The null object does not have a getter 'importsAndExports'.
NoSuchMethodError: method not found: 'importsAndExports'
Receiver: null
Arguments: []

This build is the first build where the issue has re-appeared (previous build is fine)

This issue had already been seen with 1.12-DEV at the e/o june, see #2798

Apparently both the green & red builds use the same Dart version (1.11.3 - print at l 140 on Travis logs).

@kevmoo @sigmundch any idea of what could go wrong ?