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Thus the adhoc univops can be removed at the end of the deprecation period.
Should we keep exposing restrict_universe_context or make people go
through restrict?
restrict_universe_context is used directly only by newring, where it's
a choice between
let univs = UState.restrict_universe_context univs vars in
and
let univs = UState.(context_set (restrict (of_context_set univs) vars)) in
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This finishes the splitting of Universes.
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This API is a bit strange, I expect it will change at some point.
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In a component-based source code organization of Coq `intf` doesn't
fit very well, as it sits in bit of "limbo" between different
components, and indeed, encourages developers to place types in
sometimes random places wrt the hierarchy. For example, lower parts of
the system reference `Vernacexpr`, which morally lives in a pretty
higher part of the system.
We move all the files in `intf` to the lowest place their dependencies
can accommodate:
- `Misctypes`: is used by Declaremod, thus it has to go in `library`
or below. Ideally, this file would disappear.
- `Evar_kinds`: it is used by files in `engine`, so that seems its
proper placement.
- `Decl_kinds`: used in `library`, seems like the right place. [could
also be merged.
- `Glob_term`: belongs to pretyping, where it is placed.
- `Locus`: ditto.
- `Pattern`: ditto.
- `Genredexpr`: depended by a few modules in `pretyping`, seems like
the righ place.
- `Constrexpr`: used in `pretyping`, the use is a bit unfortunate and
could be fixed, as this module should be declared in `interp` which
is the one eliminating it.
- `Vernacexpr`: same problem than `Constrexpr`; this one can be fixed
as it contains stuff it shouldn't. The right place should be `parsing`.
- `Extend`: Is placed in `pretyping` due to being used by `Vernacexpr`.
- `Notation_term`: First place used is `interp`, seems like the right place.
Additionally, for some files it could be worth to merge files of the
form `Foo` with `Foo_ops` in the medium term, as to create proper ADT
modules as done in the kernel with `Name`, etc...
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We deprecate a few functions that were deprecated in the comments plus
we place `Nameops` and `Univops` in engine where they do seem to
belong in the large picture of code organization.
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Reminder of (some of) the reasons for removal:
- Despite the claim in sigma.mli, it does *not* prevent evar
leaks, something like:
fun env evd ->
let (evd',ev) = new_evar env evd in
(evd,ev)
will typecheck even with Sigma-like type annotations (with a proof of
reflexivity)
- The API stayed embryonic. Even typing functions were not ported to
Sigma.
- Some unsafe combinators (Unsafe.tclEVARS) were replaced with slightly
less unsafe ones (e.g. s_enter), but those ones were not marked unsafe
at all (despite still being so).
- There was no good story for higher order functions manipulating evar
maps. Without higher order, one can most of the time get away with
reusing the same name for the updated evar map.
- Most of the code doing complex things with evar maps was using unsafe
casts to sigma. This code should be fixed, but this is an orthogonal
issue.
Of course, this was showing a nice and elegant use of GADTs, but the
cost/benefit ratio in practice did not seem good.
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Incidentally, this fixes a printing bug in output/inference.v where the
displayed name of an evar was the wrong one because its type was not
evar-expanded enough.
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Before this patch, this module was a member of the library folder, which had
little to do with its actual use. A tiny part relative to global registering
of universe names has been effectively moved to the Global module.
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This allows to remove a lot of independent code from Evd which was put
into the UState module. The API is not perfect yet, but this is a first
pass. Names of data structures should be thought about too because they
are way too similar.
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together with the tactic monad.
The move is not complete yet, because some file candidates for this directory
have almost useless dependencies in other ones that should not be moved.
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