[Moose-dev] flattening list rule in petit parser

I have multiple rules that are like

identifierList ^ identifier, ($, asParser trim, identifier) star

It parses a list of identifiers. The output is

#('abc' #(#($, 'def') #($, 'ghj')))

What I like to have is an output of

#( 'abc' 'def' 'ghj' )

I can produce this by changing the rule to

^ identifier , (($, asParser trim, identifier) ==> [:nodes| nodes second]) star ==> [:nodes| (Array with: nodes first) copyWithAll: nodes second ]

But now the rule is uglified. It doesn't work with flatten because I it would flatten all together and I want to have the identifiers separated. What would be useful is a "skip" keyword for the parser so that it is skipped for the output nodes (that would be something like ?: in perl regex). Are there some better way to do this?

thanks in advance,

Norbert