I am using Visual Fortran Compiler XE 22.214.171.124 .
When I compile with option /stand:f08 , I am getting the following message:
warning #7416: Fortran 2008 does not allow this intrinsic procedure. [ATANH]
I don't think the above message is necessary. I have just checked the Fortran 2008 standard, and ATANH is there. Look on page 331.