[antlr-interest] rule return value not declared

[David-Sarah Hopwood]

Kendall Shaw wrote:
> Gavin Lambert <antlr at mirality.co.nz> writes:
>> At 09:37 29/07/2009, Kendall Shaw wrote:
>>> The result is that the return attribute "list" is not
>>> declared in the resulting parser:
>> [...]
>>>    @init { list = new ArrayList<String>(); }
>>>    : (t=thingy { list.add($t.name); })+
>> You should be using $list here.
> 
> Thanks. It's odd that it works in all of my other rules without the '$'.

ANTLR (at least the Java target) declares a variable corresponding to each
named child of a rule, with the same name. This is probably a bad idea
since the semantics of referring to that variable are undocumented and
usually not what you want, but it does not cause an error.

-- 
David-Sarah Hopwood  ⚥  http://davidsarah.livejournal.com