node label/key in XText when translating from grako -

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in grako 1 can use following name:e add result of e ast using name key. example

var_def     =     var+:id {',' var+:id}*

what translation of xtext? tried 

var_def:      var=id (',' var=id)*;

which not failing, raising following warning 

multiple markers @ line - possibly assigned value of feature 'var' may overridden    subsequent assignments. - assignment override possibly assigned value of    feature 'var'.

i think trying mimic name behavior, not have success.

with solution last id available in ast. assume var should multi-valued feature holding ids, not last one. can expressed as

var_def:     var+=id (',' var+=id)*;

in resulting ast var list of ids.


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