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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 is the continuation of #244, we now deprecate `CErrors.error`,
the single entry point in Coq is `user_err`.
The rationale is to allow for easier grepping, and to ease a future
cleanup of error messages. In particular, we would like to
systematically classify all error messages raised by Coq and be sure
they are properly documented.
We restore the two functions removed in #244 to improve compatibility,
but mark them deprecated.
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Inspired by https://coq.inria.fr/bugs/show_bug.cgi?id=5229 , which
this PR solves, I propose to remove support for non-synchronous
options.
It seems the few uses of `optsync = false` we legacy and shouldn't
have any impact.
Moreover, non synchronous options may create particularly tricky
situations as for instance, they won't be propagated to workers.
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Now it is a private field, locations are optional.
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Getting a key only needs to observe the root of a term. This hotspot was
observed in HoTT.
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The transition has been done a bit brutally. I think we can still save a
lot of useless normalizations here and there by providing the right API
in EConstr. Nonetheless, this is a first step.
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For now we only normalize sorts, and we leave instances for the next
commit.
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Was breaking e.g. fiat-crypto.
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All functions where actually called with the second argument of the pending
problem being the current evar map. We simply remove this useless and
error-prone second component.
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This is another perfomance-critical function in unification. Putting it in
the EConstr API was changing the heuristic, so better revert on that change.
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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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It seems this is a performance-critical function for unification-heavy code.
In particular, tactics relying on meta unification suffered an important
penalty after this function was rewritten with the evar-insensitive API, as
witnessed e.g. by Ncring_polynom whose compilation time increased by ~30%.
I am not sure about the specification of this function, but it seems safer
to revert the changes and just do it the old way. It may even disappear if
we get rid of the old unification algorithm at some point.
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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 the decoupling of the notions of context containing kernel
terms and context containing tactic-level terms.
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We make mli files look to what they were looking before the move to EConstr
by opening this module.
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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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Pierre-Marie Pédrot
Guillaume Melquiond
Maxime Dénès
Emilio Jesus Gallego Arias
Gaetan Gilbert