Function assignment

MathBox/mathbox-core.js:32714–32721

(id)

}

function assignment(id) {
  return infixr(id, 10, function(left) {
    this.children = [left, expression(9)]
    this.assignment = true
    this.type = 'assign'
    return this
  })
}

function advance(id) {
  var next