directly inside dart2js.
A few notes:
* I ended up adding support for this feature also in dart2js with --use-kernel, it was not implemented correctly before. This is why more tests are passing.
* I played with two other ideas:
(a) making this a compile-time error instead
(b) making it a warning if the arguments were constant and implement it as a constant, treat it as an error if they were not.
Unfortunately both are a breaking changes, so I backed out from them. IMO (a) is the cleanest thing to do long term, and we should raise this with the language team.
R=efortuna@google.com
Review-Url: https://codereview.chromium.org/2896393003 .
Sigmund Cherem
dd70d8b655