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