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Turn some "simpl" into "compute". Also do the same for the few
"simpl (Z.of_nat ...)". This way, definition like Z.max are properly
reduced, and moreover zify isn't sensible anymore to the
"Arguments Z.of_nat : simpl never" that some user want (see also #5039).
Unfortunately, the compute we're using now still honor the "Opaque"
declarations, so a "Opaque Z.max" will block things again (see also #5374).
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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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As per https://github.com/coq/coq/pull/716#issuecomment-305140839
Partially using
```bash
git grep --name-only 'anomaly\s*\(~label:"[^"]*"\s*\)\?\(Pp.\)\?(\(\(Pp.\)\?str\)\?\s*".*[^\.!]")' | xargs sed s'/\(anomaly\s*\(~label:"[^"]*"\s*\)\?\(Pp.\)\?(\(\(Pp.\)\?str\)\?\s*".*\s*[^\.! ]\)\s*")/\1.")/g' -i
```
and
```bash
git grep --name-only ' !"' | xargs sed s'/ !"/!"/g' -i
```
The rest were manually edited by looking at the results of
```bash
git grep anomaly | grep '\.ml' | grep -v 'anomaly\s*\(~label:"[^"]*"\s*\)\?\(Pp\.\)\?(\(\(Pp.\)\?str\)\?\s*".*\(\.\|!\)")' | grep 'anomaly\($\|[^_]\)' | less
```
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This fixes [bug #5019](https://coq.inria.fr/bugs/show_bug.cgi?id=5019),
"[zify] loops on dependent types"; before, we would see a `Z.of_nat (S
?k)` which could not be turned into `Z.succ (Z.of_nat k)`, add a
hypothesis of the shape `0 <= Z.of_nat (S k)`, turn that into a
hypothesis of the shape `0 <= Z.succ (Z.of_nat k)`, and loop forever on
this.
This may not be the "right" fix (there may be cases where `zify` should
succeed where it still fails with this change), but this is a pure
bugfix in the sense that the only places where it changes the behavior
of `zify` are the places where, previously, `zify` looped forever.
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Two issues in one:
- some focused_simpl were called on the wrong locations
- some focused_simpl were done on whole equations
In the two cases, this could be bad if "simpl" goes too far
with respect to what omega expects: later calls to "occurrence"
might fail. This may happen for instance if an atom isn't a variable,
but a let-in (b:=5:Z in the example).
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Constrintern.pf_global returns a global_reference, not a constr,
adapt plugins accordingly, properly registering universes where
necessary.
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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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We move Coqlib to library in preparation for the late binding of
Gallina-level references. Placing `Coqlib` in `library/` is convenient
as some components such as pretyping need to depend on it.
By moving we lose the ability to locate references by syntactic
abbreviations, but IMHO it makes to require ML code to refer to
a true constant instead of an abbreviation/notation.
Unfortunately this change means that we break the `Coqlib`
API (providing a compatibility function is not possible), however we
do so for a good reason.
The main changes are:
- move `Coqlib` to `library/`.
- remove reference -> term from `Coqlib`. In particular, clients will
have different needs with regards to universes/evar_maps, so we
force them to call the (not very safe) `Universes.constr_of_global`
explicitly so the users are marked.
- move late binding of impossible case from `Termops` to
`pretying/Evarconv`. Remove hook.
- `Coqlib.find_reference` doesn't support syntactic abbreviations
anymore.
- remove duplication of `Coqlib` code in `Program`.
- remove duplication of `Coqlib` code in `Ltac.Rewrite`.
- A special note about bug 5066 and commit 6e87877 . This case
illustrates the danger of duplication in the code base; the solution
chosen there was to transform the not-found anomaly into an error
message, however the general policy was far from clear. The long
term solution is indeed make `find_reference` emit `Not_found` and
let the client handle the error maybe non-fatally. (so they can test
for constants.
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resolution trace
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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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For now we only normalize sorts, and we leave instances for the next
commit.
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This is cumbersome, because now code may fail at link time if it's not
referring to the correct module name. Therefore, one has to add corresponding
open statements a the top of every file depending on a Ltac module. This
includes seemingly unrelated files that use EXTEND statements.
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Now they are useless because all of the primitives are (should?) be
evar-insensitive.
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Due to the introduction of the monadic layer, an exception was raised at
a later time and not caught properly.
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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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There was no reason to keep them separate since quite a long time. Historically,
they were making Genarg depend or not on upper strata of the code, but since
it was moved to lib/ this is not justified anymore.
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mainly concerning referring to "Context.{Rel,Named}.get_{id,value,type}" functions.
If multiple modules define a function with a same name, e.g.:
Context.{Rel,Named}.get_type
those calls were prefixed with a corresponding prefix
to make sure that it is obvious which function is being called.
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module)
For the moment, there is an Error module in compilers-lib/ocamlbytecomp.cm(x)a
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For now, the pack name reuse the previous .cma name of the plugin,
(extraction_plugin, etc).
The earlier .mllib files in plugins are now named .mlpack.
They are also handled by bin/ocamllibdep, just as .mllib.
We've slightly modified ocamllibdep to help setting the -for-pack
options: in *.mlpack.d files, there are some extra variables such as
foo/bar_FORPACK := -for-pack Baz
when foo/bar.ml is mentioned in baz.mlpack.
When a plugin is calling a function from another plugin, the name
need to be qualified (Foo_plugin.Bar.baz instead of Bar.baz).
Btw, we discard the generated files plugins/*/*_mod.ml, they are
obsolete now, replaced by DECLARE PLUGIN.
Nota: there's a potential problem in the micromega directory,
some .ml files are linked both in micromega_plugin and in csdpcert.
And we now compile these files with a -for-pack, even if they are
not packed in the case of csdpcert. In practice, csdpcert seems
to work well, but we should verify with OCaml experts.
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It is indeed confusing, as it has little to do with the proper refine defined
in the New submodule. Legacy code relying on it should call the Logic or
Tacmach modules instead.
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The ARGUMENT EXTEND macro was discriminating between parsing entries known
statically, i.e. defined in Pcoq and unknown entires. Although simplifying
a bit the life of the plugin writer, it made actual interpretation difficult
to predict and complicated the code of the ARGUMENT EXTEND macro.
After this patch, all parsing entries and generic arguments used in an
ARGUMENT EXTEND macro must be reachable by the ML code. This requires adding
a few more "open Pcoq.X" and "open Constrarg" here and there.
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