[antlr-interest] ANTLR 3: Bug in codegen.g

[Oliver Zeigermann]

In codegen.g, rule atom the attribute "label" is set for
lexerStringRef, charRef and lexerRuleRef while there is no attribute
label for these rules. This causes an error upon generation.

Obvious solution: either remove code that sets "label" (already done
at certain parts of rule atom) or add attribute "label" to the
templates.

Oliver