The use of the constructors fails, and the code to reverse the order of
the components fails.

NAG Fortran Compiler Release 5.2(668)
Error: ex_09.1.3.f90, line 4: Structure constructor for MY_COMPLEX which has PRIVATE components
       detected at )@,
Error: ex_09.1.3.f90, line 5: Structure constructor for MY_COMPLEX which has PRIVATE components
       detected at )@,
Error: ex_09.1.3.f90, line 8: Attempt to access PRIVATE component IMAGINARY of type MY_COMPLEX
       detected at %@IMAGINARY
Error: ex_09.1.3.f90, line 8: Attempt to access PRIVATE component REAL of type MY_COMPLEX
       detected at %@REAL
Error: ex_09.1.3.f90, line 9: Attempt to access PRIVATE component REAL of type MY_COMPLEX
       detected at %@REAL
Error: ex_09.1.3.f90, line 9: Attempt to access PRIVATE component IMAGINARY of type MY_COMPLEX
       detected at %@IMAGINARY
[NAG Fortran Compiler pass 1 error termination, 6 errors]