Record Updates in Coq

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" summary

Implements record updates in Coq by generating setters via type class resolution and Ltac: a Ltac procedure solve_setter extracts an ada_expansion (eval hnf), uses eval pattern to substitute a projection, and registers itself as a hint so Coq builds a setter instance on demand. Adds notation for assigning constants and notation for nested updates, an OCaml plugin to auto-generate projections, runtime checks that the ada_expansion is the identity, and ships on GitHub and opam.

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" chapters (10)

1. 0:00Record updates in Coq
2. 1:06How set is implemented
3. 1:27Record fields with ada expansions
4. 2:09Setter using ltac
5. 3:53Type classes for setters
6. 5:59Automating setters with hints
7. 6:41Why instances work like hint DBs
8. 7:03Improving UI with notations
9. 8:30Reducing boilerplate with plugins
10. 9:34Nested record updates & conclusion