nagfor is storing the parameterized array like a fixed size array, which is the behavior I would expect. It seems that nagfor is the only compiler around that correctly implements the PDTs!
Yes, and that is a shame. They have been in the language for over 20 years now (since f2003), and I have many situations where I could use them, if only they were portable among all of the popular fortran compilers (especially gfortran). There are workarounds within the language. In this case, I use allocatable components instead, but then you can’t do things like p => x(:)%a(1).
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Your test does not prove that - only that it happened to seem to work. Copying descriptor data will sometimes not reveal a problem, but other times it will.
Let me rephrase: nagfor is the only compiler among the 5 tested that doesn’t miserably fail on this very simple test code 
Your test depends on undefined behavior.
Where is the UB here?
I think his comment was just about the PDT code, which does not involve TRANSFER.
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