Implement Fortran doctest feature
It will work similarly to Python: one can have code like the following in Fortran comments:
! >>> use utils, only: f ! >>> f(5) ! 10
And it will discover such blocks and execute them and check that the result (
10 in the example above) agrees with the command (
This will allow Fortran code to be documented with examples of usage (and tested to ensure it actually works), just like in Python.