Heimdell

var ok  = (value,   offset) => ({good: true, value, offset})
var err = (message, offset) => ({message, offset})

var pure     = (value)      => ({type: "pure", value})
var fail     = (message)    => ({type: "fail", message})
var token    = (token)      => ({type: "token", token})
var any      = (...parsers) => ({type: "any", parsers})
var many     = (parser)     => ({type: "many", parser})
var some     = (parser)     => ({type: "some", parser})