Ben,
1. Should this feature be placed behind a LANGUAGE pragma? No, I don't think it should. I consider it a tiny addition to TypeFamilies that is not worth having its separate pragma. Injective TFs are fully backwards compatible, so no existing code will be broken.
2. Could you perhaps add some text to better motivate the feature in the users guide? Done. Tell me whether you like the new version.
BTW do we still have nightly builds of User's Guide? Janek
Referring to the paper for the details of semantics of the feature and its implementation is fine, but expecting a new user to refer to the paper to even know *why* they might want to use it seems a bit unfriendly.
Thanks!
Cheers,
- Ben
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