Add test for new final-field implicit setter semantics.

Add test for new final-field implicit setter semantics.

BUG= http://dartbug.com/13917 http://dartbug.com/13918 http://dartbug.com/13919
R=johnniwinther@google.com

Committed: https://code.google.com/p/dart/source/detail?r=28400

[Lasse Reichstein Nielsen, 2013-10-09 11:08:39]

https://codereview.chromium.org/26682002/diff/1/tests/language/implicit_sette...
File tests/language/implicit_setter_test.dart (right):

https://codereview.chromium.org/26682002/diff/1/tests/language/implicit_sette...
tests/language/implicit_setter_test.dart:20: void set cx(value) { x = value; } 
// Should throw if used.
I think this line should be a static warning because it assigns to a final
field. I'll check if I can keep it in, or if I have to omit it.

I think the bug I was trying to hit has been fixed, so I'll just change it to be
a static type warning.

[Johnni Winther, 2013-10-09 11:19:15]

lgtm

[Lasse Reichstein Nielsen, 2013-10-09 11:27:37]

Committed patchset #2 manually as r28400 (presubmit successful).

[ngeoffray, 2013-10-17 09:15:23]

https://codereview.chromium.org/26682002/diff/4001/tests/language/implicit_se...
File tests/language/implicit_setter_test.dart (right):

https://codereview.chromium.org/26682002/diff/4001/tests/language/implicit_se...
tests/language/implicit_setter_test.dart:1: // Copyright (c) 2012, the Dart
project authors.  Please see the AUTHORS file
2012 -> 2013

https://codereview.chromium.org/26682002/diff/4001/tests/language/implicit_se...
tests/language/implicit_setter_test.dart:22: erase(this).x = value;  // but
crash even if the direct setting is omitted.
Why isn't this a /// 03: runtime error?