Silence a false positive "-Wunneeded-internal-declaration"
Silence a false positive "-Wunneeded-internal-declaration"

Clang inlines ```constraints_and_b_v_are_compatible``` into
```do_project``` and after that emits a wrong warning about the former not
being used. Explicitly annotating ```constraints_and_b_v_are_compatible```
with inline helps.

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