[antlr-interest] The right way to invoke templates with nullarguments?

Terence Parr parrt at cs.usfca.edu
Fri Jun 22 01:38:03 PDT 2007


On Jun 22, 2007, at 6:32 PM, Tim Clark wrote:

> Listen to the sound of a penny dropping!
>
> Should have been obvious, but I blame the documentation (and my old  
> brain :) - note the subtle difference:
>
> A (not allowed by Antlr): stat2={$s2 == null ? null : $s2.st}

Oh, right!  Yeah, it was even worse.  $s2 is correct syntax, but I  
don't let you test that w/o an attribute.  Yup, i need to find a way  
to deal with this.

Ter



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