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2020-05-07[declare] Merge DeclareDef into DeclareEmilio Jesus Gallego Arias
The API in `DeclareDef` should become the recommended API in `Declare`. This greatly reduces the exposure of internals; we still have a large offender in `Lemmas` but that will be taken care of in the next commit; effectively removing quite some chunks from `declare.mli`. This PR originally introduced a dependency cycle due to: - `Declare`: uses `Vernacexpr.decl_notation list` - `Vernacexpr`: uses `ComHint.hint_expr` - `ComHint`: uses `Declare.declare_constant` This is a real cycle in the sense that `ComHint` would have also move to `DeclareDef` in the medium term. There were quite a few ways to solve it, we have chosen to move the hints ast to `Vernacexpr` as it is not very invasive and seems consistent with the current style. Alternatives, which could be considered at a later stage are for example moving the notations AST to `Metasyntax`, having `Declare` not to depend on `Vernacexpr` [which seems actually a good thing to do in the medium term], reworking notation support more deeply...
2020-04-21[declare] [tactics] Move declare to `vernac`Emilio Jesus Gallego Arias
This PR moves `Declare` to `vernac` which will hopefully allow to unify it with `DeclareDef` and avoid exposing entry internals. There are many tradeoffs to be made as interface and placement of tactics is far from clear; I've tried to reach a minimally invasive compromise: - moved leminv to `ltac_plugin`; this is unused in the core codebase and IMO for now it is the best place - hook added for abstract; this should be cleaned up later - hook added for scheme declaration; this should be cleaned up later - separation of hints vernacular and "tactic" part should be also done later, for now I've introduced a `declareUctx` module to avoid being invasive there. In particular this last point strongly suggest that for now, the best place for `Class_tactics` would be also in `ltac`, but I've avoided that for now too. This partially supersedes #10951 for now and helps with #11492 .
2020-04-21[hints] Move and split Hint Declaration AST to vernacEmilio Jesus Gallego Arias
This moves the vernacular part of hints to `vernac`; in particular, it helps removing the declaration of constants as parts of the `tactic` folder.