Using -includesource to include source code

The source code for a proc or a class method is not included in the documentation. For internal documentation, it may be convenient to have the source code be visible as part of documentation. Specifying the option -includesource true to a command causes the source code to be included in the documentation. It is intended that in a future release, HTML output formats will show source code in collapsible sections though this is not currently done.