[antlr-interest] Bug or misunderstanding?: missing attribute access on rule scope

[David-Sarah Hopwood]

Kaleb Pederson wrote:
> I'm getting an error that doesn't make any sense, either because I've
> missed something fundamental or I've stumbled across a bug. I'm doing
> some type checking within a tree parser.  I have a plusMinusExpression
> which can either be a negation or a subtraction expression.  In order
> to to check to see which it is, I have `if ($rhs != null)` within my
> action.  That line, however, causes the following error:
> 
> SemanticChecker.g:163:3: missing attribute access on rule scope: rhs

You can use "if ($rhs.tree != null)".

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