'var' not allowed when using 'final' in instance variable

[DartBot]

This issue was originally filed by zundel@google.com

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Field3NegativeTest passes on frog. It was filed as a broken test under issue #354, but I've updated it. The 'var' and 'final' keywords are mutually exclusive:

I've updated the test as follows in http://codereview.chromium.org/8859002

class C {
  final var a = 0; // illegal: var cannot follow final.
}

main() {
  var val = new C();
  Expect.equals(val.a, 0);
}

[DartBot]

This comment was originally written by zundel@google.com

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(see the grammar specified in chapter 5 of the spec, "Variables")

[jmesserly]

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[anders-sandholm]

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[kasperl]

Added WontFix label.