Missing checks for final variables

[askeksa-google]

It is illegal to write both final and var:

final var a = 0;

It is illegal for a final field to not have an initializer and not be initialized in every constructor (if there are no constructors, there is an implicit constructor which has no initializers):

class C {
  final a;
}

Both exposed by language_2/field3_test.

[dgrove]

with -dev.59:

cat ~/tmp/dart2stable/33022.dart
final var a = 0;

class C {
final a;
}
dgrove@dgrove:~$ /usr/lib/google-dartlang/bin/dartanalyzer --preview-dart-2 ~/tmp/dart2stable/33022.dart
Analyzing /usr/local/google/home/dgrove/tmp/dart2stable/33022.dart...
error • Members can't be declared to be both 'final' and 'var' at tmp/dart2stable/33022.dart:1:7 • final_and_var
warning • The final variable 'a' must be initialized at tmp/dart2stable/33022.dart:4:9 • final_not_initialized
1 error and 1 warning found.