@@ -87,6 +87,16 @@ We follow the Fortran 2018 standard. However, features not available in gfortran
Use the `.f08` filename extension for Fortran source code (or the `.F08` extension if the source file needs to be preprocessed).
## Disabling implicit typing and implicit procedure declaration
The following statement should be added to every program unit (module, main program, external subprogram), to disable implicit typing and implicit procedure declaration:
```
implicit none (type, external)
```
It can also be a good idea to add `implicit none` within interface blocks, when there are a lot of dummy arguments.
