The Dart 1 specification of 'generic method syntax' had no status
indicator, it is now marked as 'background material' because generic
methods (in full) have been integrated into the language specification.
Several other changes of a similar nature.
Implication: It should now be possible for readers of these documents
to trust their status indication. As we go, we will need to update them
again, especially when something is integrated into the language
specification.
Do we want to migrate background material to another directory? Do we
want to rename the directory `informal` to `feature` or somesuch?
Change-Id: Ia3851bdbe7b5a46d71848c376906f95feb4db349
Reviewed-on: https://dart-review.googlesource.com/34663
Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
Erik Ernst