Async: How can use implicit args in auto and autoinject

Hi,
How can i use implicit args list for auto and autoinject.
I use async 2.1.5 and nodeJs 4.2.6

eg:

var args = [ 'arg1', 'arg2', 'arg3' ] ,
funcList = {
arg1: function(cb){ cb(null,'xyz') },
arg2: function(cb){ cb(null,'xyz') },
arg3: function(cb){ cb(null,'xyz') }
}

funcList[ 'arg4' ] = [args, function( r, cb ){
// use or change r[ args[0] ] or r[ args[1] ] ...
}]

async.auto(funcList, callback);

at the run time i get Error: async.auto task arg4 has a non-existent dependency arg1, arg2, arg3 in arg1, arg2, arg3