turns out `m4_index` treats its first argument as one big string and not a
sequence of words. `m4_regexp` with words delimiters in the regexp is thus
better suited for the task.

Sarif validator insists that its messages end with a full stop.

yojson generates an array with one element instead of a plain string.

As Frama-C parses preprocessed files, `pos_cnum` field of a position indicates
the total number of bytes seen in the expansion of included files...

It appears that the alias mechanism does not inform `Dynamic` of the aliases