No src Restriction

Currently, no [package] may have any package-unit called src.

For example, all the following are illegal package names.

• src.foo.bar
• foo.src.bar
• foo.bar.src

This restriction will be lifted in the future,

It currently serves as a sanity-check for [PriTeX].

The PriTeX system is invoked from within a [LaTeX] document via [write8].