(Program
  (Binary
    (Identifier)
  { (Other "==")
  ->(Other "<=>") }
    (Identifier))
  (Binary
    (Identifier)
  { (Other "!=")
  ->(Other "=~") }
    (Identifier))
{+(Assignment
    (Identifier)
    (Unary
      (Other "!")
      (Identifier)))+}
{-(Binary
    (Identifier)
    (Other "===")
    (Identifier))-})