[antlr-interest] Grammar for antlr 3b7/3b8

[Ilia Kantor]

The problem from my previous letter was:

The input is:#r->a{1}{2}
The output should put {..} into separate subtrees:

^(GET_PROPERTY_ARGUMENTS 1)
^(GET_PROPERTY_ARGUMENTS 2)

But actually it goes wrong branch and reads ->a{1}{2} as plain text, or
another bad thing happens, not sure what's going on.

Thanks!