[Lazarus] dtm_maker project compile errors with TList code.

[Luk Vandelaer]

Your constructor should be something like

constructor TIsland.Create(const ATerrain : Terrain_type;
         const ATerrain_char : char;
         const Adescription : description_type;
         const Ax, Ay, Alocation_number : integer;
         const Aexits : exit_type );
begin
  // Save the passed parameters
  self.ATerrain   := ATerrain;
  self.ATerrain_char := ATerrain_char;
  self.Adescription := Adescription;
  self.Ax := Ax;
  self.Ay := Ay;
  self.Alocation_number := Alocation_number;
  self.Aexits := Aexits;
end;


You declared the properties as read only, so assignments are not possible, 
instead you should make the assignments to the private fields that the 
properties will read.

Luk