104     | BTBool

   104     | BTBool

   105     | BTFloat

   105     | BTFloat

   106     | BTRecord [(String, BaseType)]

   106     | BTRecord [(String, BaseType)]

   107     | BTArray Range BaseType BaseType

   107     | BTArray Range BaseType BaseType

   108     | BTFunction BaseType

   108     | BTFunction BaseType

   109     | BTPointerTo BaseType

   110     | BTPointerTo BaseType

   110     | BTUnresolved String

   111     | BTUnresolved String

   111     | BTSet BaseType

   112     | BTSet BaseType

   112     | BTEnum [String]

   113     | BTEnum [String]

   113     | BTVoid

   114     | BTVoid