Portable way to check existence of ISO_FORTRAN_ENV intrinsic module

@msz59 explained well the nuance between the type name and the double precision real kind. In your post I see one more instance of confusion that I also had until recently–the meaning of MFE’s deprecated.

The standard defines obsolescent (considered redundant and subject to deletion in the future) and deleted features. It doesn’t define deprecated features.

MFE defines deprecated features and this “status” is the authors’ choice and unrelated to the the standard. Quoting from A.1:

We note that his decision to group certain features into an appendix and to deprecate their use is ours alone, and does not have the actual or implied approval of either WG5 or J3.

The thread where I asked about this is:

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