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Actually all the new_ functions are in evarutil still
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clear_hyps remain with no alternative
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In #6092, `global_reference` was moved to `kernel`. It makes sense to
go further and use the current kernel style for names.
This has a good effect on the dependency graph, as some core modules
don't depend on library anymore.
A question about providing equality for the GloRef module remains, as
there are two different notions of equality for constants. In that
sense, `KerPair` seems suspicious and at some point it should be
looked at.
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indirect uses of tactic `clear`.
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- Be more precise when trying to clear an hypothesis which
occurs implicitly in a global constant.
- Warns if destruct/induction cannot clear an hypothesis occurring
implicitly in a global.
In the first case, the change in situation
Section A. Variable a:nat. Definition b:=a=a. Goal b=b. clear a.
is:
- before: "a is used in conclusion"
- after: "a is used implicitly in b in conclusion"
In the second case:
Section A. Variable a:nat. Definition b:=a=a. Goal b=b. destruct a.
produces a warning: "Cannot remove a, it is used implicitly in b".
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Four modes currently supported to deal with clashes:
1. Failing in case of clash
2. Renaming the most recent one
3. Renaming the previous hypothesis of same name if not a section variable
4. Renaming the previous hypothesis of same name even if a section variable
The current mode is 3. Keeping it active by default
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Normalization sounds like it should be semantically noop.
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We bootstrap the circular evar_map <-> econstr dependency by moving
the internal EConstr.API module to Evd.MiniEConstr. Then we make the
Evd functions use econstr.
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For instance, error in "Goal forall a f, f a = 0" is now located.
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In Reductionops.infer_conv we did not have enough information to
properly try to unify irrelevant universes. This requires changing the
Reduction.universe_compare type a bit.
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We simply use a record and pack the rel and var substitutions in it. We also
properly compose variable substitutions.
Fixes #6534: Fresh variable generation in case of clash is buggy.
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We need to a partial restore. I think that we could design a better
API, but further work on the toplevel state should improve it
progressively.
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There don't really bring anything, we also correct some minor nits
with the printing function.
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Note the problem with `create_evar_defs`.
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We do up to `Term` which is the main bulk of the changes.
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This is a first step towards some of the solutions proposed in #6008.
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In particular, this fixes #5757 which used restrict_evar to refine the
information on the source of an evar, and which should have set the
"cleared" flag.
Also renaming flag "restricted" since it is not only about "clear".
I guess this is what we want in general, but I did not survey all uses
of restrict_evar so, maybe, this should be refined further.
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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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This allows a better control on the name to give to an evar and, in
particular, to address the issue about naming produced by "epose
proof" in one of the comment of Zimmi48 at PR #248 (see file names.v).
Incidentally updating output of Show output test (evar numbers shifted).
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This completes the Loc.ghost removal, the idea is to gear the API
towards optional, but uniform, location handling.
We don't print <unknown> anymore in the case there is no location.
This is what the test suite expects.
The old printing logic for located items was a bit inconsistent as
it sometimes printed <unknown> and other times it printed nothing as
the caller checked for `is_ghost` upstream.
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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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This removes quite a few unsafe casts. Unluckily, I had to reintroduce
the old non-module based names for these data structures, because I could
not reproduce easily the same hierarchy in EConstr.
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This allows to factorize code and prevents the unnecessary use of back and
forth conversions between the various types of terms.
Note that functions from typing may now raise errors as PretypeError rather
than TypeError, because they call the proper wrapper. I think that they were
wrongly calling the kernel because of an overlook of open modules.
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This saves a quadratic allocation by replacing arrays with maps.
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Matthieu Sozeau
Matthieu Sozeau
Emilio Jesus Gallego Arias
Gaëtan Gilbert
Pierre-Marie Pédrot
Hugo Herbelin
Théo Zimmermann
Maxime Dénès