types question

How do you return a type from a function? I tryied this but it doesnt work. I get an "Illegal Type Conversion" error when compiling.

Type alien
   Field x,y
End type

a.alien=randalien()

Print a\x
Print a\y
Waitkey()
End

Function randalien()
   a.alien=New alien
   a\x=Rand(0,100)
   a\y=Rand(0,100)
   Return a.alien
End Function

I get the error where the function returns the varible. Is there anyway to return the a.alien that I create in the function to be used in the main program?