[antlr-interest] partial tree rewrites

[Benoit Fouletier]

I'm trying to simplify a rule from:
 VAR ID ASSIGN INT
 -> VAR ID COLON TYPE["int"] ASSIGN INT
| VAR ID ASSIGN StringValue
 -> VAR ID COLON TYPE["string"] ASSIGN StringValue

to something like:

 (VAR ID -> VAR ID)
 (
ASSIGN INT
-> COLON TYPE["int"] ASSIGN INT
 | ASSIGN StringValue
-> COLON TYPE["string"] ASSIGN StringValue
 )

Do I have the syntax wrong, or are partial rewrites simply not possible?

    Ben
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