Fix hilighting of string interpolation and several operators.

Fix hilighting of string interpolation and several operators.
Committed: https://code.google.com/p/dart/source/detail?r=1003

[Anton Muhin, 2011-10-31 17:51:31]

LGTM!

http://codereview.chromium.org/8432002/diff/1/utils/vim/syntax/dart.vim
File utils/vim/syntax/dart.vim (right):

http://codereview.chromium.org/8432002/diff/1/utils/vim/syntax/dart.vim#newco...
utils/vim/syntax/dart.vim:52: syn match   dartInterpolation     contained
"\$\(\w\+\|{[^\}]\+}\)"
not sure it's properly handled by implementations, but if the following valid
Dart:

return '${(x) { return x; }("bar")}'

?

Anyway, your solution is better than the current.

[alf, 2011-11-01 12:09:55]

Obviously it won't handle 100% of cases, but it's indeed much better that the
previous implementation.