Modern Fortran Explained: Incorporating Fortran 2018 lists in A.2 storage association, including
sequence attribute, statement, and type as deprecated features.
The Authors define a deprecated feature as a feature that became redundant (for
sequence, specifically, since Fortran 95) and whose use is not recommended. They say that deprecated feature have potential to be marked as obsolescent by the Standard, which in turn, opens a path toward deletion.
The Standard, however, doesn’t say anything about deprecated features, only obsolescent and deleted features. The
sequence attribute, statement, type are defined as usual, without note of them becoming obsolescent in the future, as far as I could find.
So, what does it really mean for Metcalf, Reid, & Cohen to list deprecated features? Are these their personal recommendations that are not necessarily aligned with the Standard?