- The error messages were wrong: the goal needs to be absorbing, not the hypothesis.
- The wrong failure number was used in `iAssumption`, which caused the error not
  to be propagated properly.

Gregory Malecha authored Mar 16, 2020 and Robbert Krebbers committed Mar 16, 2020

- remove "odd" comment
- move atomic triples to bi_scope

Paolo G. Giarrusso authored Nov 22, 2019 and Robbert Krebbers committed Nov 22, 2019

When proving `foo` through a fixpoint, Coq's guardedness checker needs to see to
which arguments `foo` is applied. Opaque lemmas applied to `foo` itself prevent
that, so make them transparent.
* Make `IntoEmpValid` lemmas transparent.
* Expose application of `IntoEmpValid` instance to its argument.
* Add comment to `tac_pose_proof`

This MR brings back the type of `tac_pose_proof` to the one it had before !329.
Hence, this seems worth a comment.

Joseph Tassarotti authored May 24, 2019 and Robbert Krebbers committed May 24, 2019

Also fixes pre-existing bug in iCombine error messages.

For half of #231.

This is a change enabling backward compatibility.

It now supports the specialization pattern `(H spat1 .. spatn)`, which first
recursively specializes the hypothesis `H` using the specialization patterns
`spat1 .. spatn`.

Thanks to @Blaisorblade for reporting.