custom operators

[pablogrisafi1975]

You are a genius! Thanks for your wonderful job!
What about defining custom operators? maybe not as flexible as Scala, when you can have the pope operator <+|:-) if you want. But I was thinking about the eq operator, so
a eq b means Object.equals(a, b). It allows you to skip null checks, keep the == for references, and it is nicer on the eye.

Also, one small thing, the example code is somehow wrong, map.get("qwe")==null is not the same as map.containsKey("qwe") unless map is null free.

(I was also going to ask about null handling with ?, but pretty much everything I want to ask is already written in 'ideas' file)

Again, incredible work!

[amelentev]

from #22: Adding new operators is very complicated. To do it we need to extend Java parser but oo-plugin only works after parsing (in annotation processing stage). There are no extension points before annotation processing in Java7 compiler.
But there is some support of plugins in Java8 compiler (-Xplugin). Maybe it is possible to extend parser there. More research needed.

About map["qwe"]. Yes. It is not the same. I just tried to fit more use cases in small example. The difference doesn't really matter for the example.
Thanks