dart-lang/async_await — pull request #16 by kmillikin (2014-08-27 19:28:18+00:00)
Title: Assignments with properties on the left-hand side and compound assignmen...

...ts.

Without doing name resolution, we can't disambiguate a.x where a is an
identifier. It could be a class name or library prefix, or it could
be a potentially mutable variable. It is translated as if it were a
mutable variable.