Ralf Jung authored 4 years ago and Robbert Krebbers committed 4 years ago

by Tej

Also, document why [simpl never] is not enough, with a link to an alternative
design.

Use that in place of the old encoding:
iris/stdpp#70 (comment 52817)

Requires dropping support for Coq 8.7.

Fixes #67.

This reverts merge request !155

According to the documentation
https://coq.inria.fr/distrib/current/refman/proof-engine/tactics.html#coq:cmd.create-hintdb,
when creating a hint database without discrimination, Coq uses the
legacy implementation, which only uses Discrimination Trees for goals
without evars and does not use opaqueness information. This commit
switches the hint databases of stdpp to the new implementation.

This instance might seem odd, but `ProofIrrel` takes a `Type` and not a `Prop`,
and stdpp already has instances for products.