label 'label' assigned to a block which is not a set

[Hunter Blakely]

Hello there, I've been trying to figure out exactly what I'm doing wrong here. If anyone can help I'd be greatly appreciative.



My grammar file contains a definition for expressions, assignments, statements, and for loops. I am trying to use a label in the for loop to describe parts of the for loop. I am receiving an error about my label: "label 'opForCountLeft' assigned to a block which is not a set".

forLoop

        : FOR opForCountLeft=(expression | assignment) TO opForCountRight=expression op=statement* NEXT 

What am I doing wrong here?

Thanks for your time.

[Terence Parr]

labels can only attach to tokens or single rule refs.

T

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