Include hierarchy is not supported in .swifttemplate files (the "diamond problem")

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I have 4 .swifttemplate files:

• Shared contains code only
• Generator contains code only
• Checks contains code only
• Output outputs to a .swift file

There is a function getProcessedTypeCount() defined in Shared
I would like to use this function both in Generator and Checks

Hence I would like a diamond-shaped include hierarchy:

• Generator includes Shared
• Checks includes Shared
• Output includes both Generator and Checks

But I can't do it due to "definition conflicts with previous value" and "ambiguous use of 'getProcessedTypeCount()'" errors.

I have tried these things:

• include Shared only in Generator → "use of unresolved identifier 'getProcessedTypeCount'" error in Checks
• include Shared neither in Generator nor in Checks, include it only in Output → "use of unresolved identifier 'getProcessedTypeCount'" error

Is there an equivalent of header include guards or #pragma once in Sourcery?
Or any other workaround?
Or any plan to include this feature in future versions of Sourcery?

Automatic resolution of ambiguous symbol definitions would be nice :-)