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diff --git a/dev/doc/changes.md b/dev/doc/changes.md index ab78b0956..bb8189efc 100644 --- a/dev/doc/changes.md +++ b/dev/doc/changes.md @@ -1,3 +1,74 @@ +## Changes between Coq 8.8 and Coq 8.9 + +### ML API + +Misctypes + +- Syntax for universe sorts and kinds has been moved from `Misctypes` + to `Glob_term`, as these are turned into kernel terms by + `Pretyping`. + +Proof engine + +- More functions have been changed to use `EConstr`, notably the + functions in `Evd`, and in particular `Evd.define`. + + Note that the core function `EConstr.to_constr` now _enforces_ by + default that the resulting term is ground, that is to say, free of + Evars. This is usually what you want, as open terms should be of + type `EConstr.t` to benefit from the invariants the `EConstr` API is + meant to guarantee. + + In case you'd like to violate this API invariant, you can use the + `abort_on_undefined_evars` flag to `EConstr.to_constr`, but note + that setting this flag to false is deprecated so it is only meant to + be used as to help port pre-EConstr code. + +- A few type alias have been deprecated, in all cases the message + should indicate what the canonical form is. An important change is + the move of `Globnames.global_reference` to `Names.GlobRef.t`. + +- Unification API returns `evar_map option` instead of `bool * evar_map` + with the guarantee that the `evar_map` was unchanged if the boolean + was false. + +ML Libraries used by Coq + +- Introduction of a "Smart" module for collecting "smart*" functions, e.g. + Array.Smart.map. +- Uniformization of some names, e.g. Array.Smart.fold_left_map instead + of Array.smartfoldmap. + +Printer.ml API + +- The mechanism in Printer that allowed dynamically overriding pr_subgoals, + pr_subgoal and pr_goal was removed to simplify the code. It was + earlierly used by PCoq. + +Source code organization + +- We have eliminated / fused some redundant modules and relocated a + few interfaces files. The `intf` folder is gone, and now for example + `Constrexpr` is located in `interp/`, `Vernacexpr` in `vernac/` and + so on. Changes should be compatible, but in a few cases stricter + layering requirements may mean that functions have moved. In all + cases adapting is a matter of changing the module name. + +Vernacular commands + +- The implementation of vernacular commands has been refactored so it + is self-contained now, including the parsing and extension + mechanisms. This involves a couple of non-backward compatible + changes due to layering issues, where some functions have been moved + from `Pcoq` to `Pvernac` and from `Vernacexpr` to modules in + `tactics/`. In all cases adapting is a matter of changing the module + name. + +### Unit testing + + The test suite now allows writing unit tests against OCaml code in the Coq + code base. Those unit tests create a dependency on the OUnit test framework. + ## Changes between Coq 8.7 and Coq 8.8 ### Bug tracker @@ -74,6 +145,11 @@ Declaration of printers for arguments used only in vernac command happen. An alternative is to register the corresponding argument as a value, using "Geninterp.register_val0 wit None". +Types Alias deprecation and type relocation. + +- A few type alias have been deprecated, in all cases the message + should indicate what the canonical form is. + ### STM API The STM API has seen a general overhaul. The main change is the |