The GNU Fortran Compiler: Fortran 2008 status

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#### 1.3.3 Fortran 2008 status

The GNU Fortran compiler supports almost all features of Fortran 2008; the wiki has some information about the current implementation status. In particular, the following are not yet supported:

- `DO CONCURRENT` and `FORALL` do not recognize a type-spec in the loop header.
- The change to permit any constant expression in subscripts and nested implied-do limits in a `DATA` statement has not been implemented.