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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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Emilio Jesus Gallego Arias
Maxime Dénès
Pierre-Marie Pédrot