Support unary - operator.

Support unary - operator.

Committed: https://code.google.com/p/dart/source/detail?r=11444 (first attempt failed)

Committed: https://code.google.com/p/dart/source/detail?r=11496

[ahe, 2012-08-24 12:58:08]

I also tried changing the corelib to use operator- instead of operator negate.
It seems to work, but I haven't tested it carefully.

[ngeoffray, 2012-08-24 15:50:43]

LGTM!

[ahe, 2012-08-28 14:33:01]

PTAL.

I reverted the first attempt at submitting this change.

I have figured out what the problem was and addressed it in patch set 5.

https://chromiumcodereview.appspot.com/10870066/diff/7017/dart/lib/compiler/i...
File dart/lib/compiler/implementation/lib/interceptors.dart (right):

https://chromiumcodereview.appspot.com/10870066/diff/7017/dart/lib/compiler/i...
dart/lib/compiler/implementation/lib/interceptors.dart:418: negate(receiver) {
Looking back, it is obvious that I cannot get rid of this interceptor. According
to pre-0.11 spec, -expression was equivalent to expression.negate(). This means
that negate is a method on num, so we must intercept.

[ngeoffray, 2012-08-28 15:31:19]

LGTM

[ahe, 2012-08-28 16:06:26]

Hi Anton,

Could you take a look at the changes to unparser.dart?

Cheers,
Peter

[ahe, 2012-08-29 08:21:50]

Thank you, Anton and Nicolas!