ometa TestParser {

  obj      = :o ?(o.type !== undefined) -> o,

  token :tt = obj:o ?(o.type == tt)     -> o
            | :t ?(t[0] == tt)          -> t, 

  foo      = ``person'' ``something'',

  topLevel = anything+:o ?(o instanceof Array) -> o

}

Obj = function(second){
  this[0] = 'person';
  this[1] = second;
  this.length = 1;
  this.type = "Object";
}
Obj.prototype = Array.prototype;

var tree = new Obj('something');

matched = TestParser.matchAll(tree, 'topLevel');

console.log(matched);