Utils.PosSourceSource code position
A position in the source code is a file, as well as begin and end location of the form col:line
Custom visitor for the Pos.marked type
Formats a position like this:
in file <file>, from <start_line>:<start_col> to <end_line>:<end_col>
Formats a position like this:
<file>;<start_line>:<start_col>--<end_line>:<end_col>
Open the file corresponding to the position and retrieves the text concerned by the position
Everything related to the source code should keep its position stored, to improve error messages
Visitors