Because of the way that the capabilities array is constructed, it breaks the usage of the Edit roles by capability plugin: https://moodle.org/plugins/view.php?plugin=tool_editrolesbycap

Stack trace:

Fatal error: Cannot redeclare mod_dataform_capabilities_dataform() (previously declared in /usr/local/moodle/releases/2.x/mod/dataform/db/access.php:42) in /usr/local/moodle/releases/2.x/mod/dataform/db/access.php on line 42

Call Stack

#	Function	Location

1	{main}( ) ../index.php:0

2	tool_editrolesbycap_load_role_definitions( )	../index.php:67

3	tool_editrolesbycap_get_default_permission( )	../locallib.php:103

4	get_default_capabilities( )	../locallib.php:67

5	load_capability_def( )	../accesslib.php:2601

The problem is when accesslib.php: load_capability_def( ) is called it calls require on the db/access.php file. Since this is called multiple times per role we get a "Cannot redeclare" error.

A possible fix could be to not make the access.php file use functions, but just have re-defined arrays. Or move the functions to another include file that is included only once.