[antlr-interest] Returns name

[Bertalan Fodor (LilyPondTool)]

I think you wanted to write

expr returns [ Register result ] :
	binary { result = $binary.result; }
	| unary { result = $unary.result; }

Return values are always set  in actions.
result=binary
assigns the label 'result' to the result of binary rule, so using that 
you should have written:
res=binary { result = $res.value; }

Bert

Ian Moor wrote:
>  I have a rule in  tree grammar:
> expr returns [ Register result ] :
> 	result=binary
> 	| result=unary ;
> where binary and unary also return registers.
>
> Antlr says 
>   "label result conflicts with rule expr's return value or parameter with same name"
>
>   I am working round this by writing
>   expr  returns  [Register result  ] 
>    @after{result=res;}
>      : res = binaryexpr 
>      | res = unaryexpr
>
> which seems to work. Shouldn't the first case work as well ?
>      Ian W Moor                    Department of Computing,
> iwm at doc.ic.ac.uk           Imperial College.
>                                     180 Queensgate
>                                      London SW7 2AZ UK.
>   
>
>
>   


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