Is creating nested subroutines/functions considered good practice in Fortran?

[FortranFan]

@tyranids

they don’t actually get their own scope. They have access to all the same variables available in whatever routine contains them.

@JohnCampbell

… When a sub/fun is contained, all variables that are in scope in the containing routine are available to the contained routine, unless there is a conflict in the named arguments of the contained routine. …

   import [[ :: ] import-name-list ]
or import, only : import-name-list
or import, none
or import, all

introduced starting Fortran 2018 standard revision provides better control about variable scope in the internal subprogram.