The status page should warn when two different types of field hooks are implemented by the same module.

Problem/Motivation

From #1199946-16: Disabled modules are broken beyond repair so the "disable" functionality needs to be removed →

Modules can't implement more than one of hook_field_storage_info(), hook_field_info() or hook_entity_info() (and their _alter counterparts).

Proposed resolution

The attached patch adds a field_requirements() function that warns in the system status report when a module implements two or more different kinds of hooks, as forbidden above.

Remaining tasks

The patch needs to be reviewed by a core developer.

User interface changes

The status page will warn if a module breaks this particular rule.

API changes

None.