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We do it so as to preserve non-focussing semantics for non-focussing
generic arguments.
This assumes that the code treats them consistently, which is not
enforced statically, but which is reasonable in the sense that when we
need a context for printing, we have no other choice as needing a
context and we needed one also at interpretation time.
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This concerns pr_value and message_of_value.
This has a few consequences. For instance, no more ad hoc message "a
term" or "a tactic", when not enough information is available for
printing, one gets a generic message "a value of type foobar".
But we also have more printers, satisfying e.g. request #5786.
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The model provides three kinds of printers depending on whether the
printer needs a context, and, if yes if it supports levels. In the
latter case, it takes defaults levels for printing when in a
surrounded context (lconstr style) and for printing when not in a
surrounded context (constr style).
This model preserves the 8.7 focussing semantics of "idtac"
(i.e. focussing only when an env is needed) but it also shows that the
semantics of "idtac", which focusses the goal depending on the type of
its arguments, is a bit ad hoc to understand.
See discussion at PR#6047
"https://github.com/coq/coq/pull/6047#discussion_r148278454".
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In Tactic Notation and TACTIC EXTEND, when an argument not ending with
"_list_sep" was given with a separator, the separator was silently
ignored.
Now:
- we take it into account if it is a list (i.e. ending with "_list"), as if
"_list_sep" was given, since after all, the "_sep" is useless in the name.
- we fail if there is a separator but it is not a "_list" or "_list_sep".
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We fix by interpreting the pattern in "change pat with term" in strict
mode by using the same interning code as for "match goal" (even if the
pattern is dropped afterwards).
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ML level can set the flags themselves.
In particular, using injection and discriminate with option "Keep
Proofs Equalities" when called from "decide equality" and "Scheme
Equality".
This fixes bug #5281.
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To this extent we factor out the relevant bits to a new file,
ltac_pretype.
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We make Vernacentries.interp functional wrt state, and thus remove
state-handling from `Future`. Now, a future needs a closure if it
wants to preserve state.
Consequently, `Vernacentries.interp` takes a state, and returns the
new one.
We don't explicitly thread the state in the STM yet, instead, we
recover the state that was used before and pass it explicitly to
`interp`.
I have tested the commit with the files in interactive, but we aware
that some new bugs may appear or old ones be made more apparent.
However, I am confident that this step will improve our understanding
of bugs.
In some cases, we perform a bit more summary wrapping/unwrapping. This
will go away in future commits; informal timings for a full make:
- master:
real 2m11,027s
user 8m30,904s
sys 1m0,000s
- no_futures:
real 2m8,474s
user 8m34,380s
sys 0m59,156s
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We place `Proof_using` in the proper place [`vernac`] and we remove
gross parsing hacks.
The new placement should allow to use the printers and more convenient
structure, and reduce strange coupling between parsing and internal
representation.
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Morphism` forms.
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We make the Stm API functional over an opaque `doc` type. This allows
to have a much better picture of what the toplevel is doing; now
almost all users of STM private data are marked by typing.
For now only, the API is functional; a PR switching the internals
should come soon thou; however we must first fix some initialization
bugs.
Due to some users, we modify `feedback` internally to include a
"document id" field; we don't expose this change in the IDE protocol
yet.
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The manual has long stated that these forms are deprecated. We add a
warning for them, as indeed `Add Morphism` is an "proof evil" [*]
command, and we may want to remove it in the future.
We've also fixed the stdlib not to emit the warning.
[*] https://ncatlab.org/nlab/show/principle+of+equivalence
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For now, a few vernacular features were lot in the process, like locating
Ltac definitions. This will be fixed in an upcoming commit.
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The old algorithm was relying on list membership, which is O(n). This was
nefarious for terms with many binders. We use instead sets in O(log n).
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This commit also fixes range selectors being incorrectly displayed.
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Augment the "Illegal tactic application" error message with the number
of extra arguments passed.
Fixes BZ#5753.
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We dont care about the order of the binder map ([map] in the code) so
no need to do tricky things with it.
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Introduce a "+" modifier for universe and constraint declarations to
indicate that these can be extended in the final definition/proof. By
default [Definition f] is equivalent to [Definition f@{+|+}], i.e
universes can be introduced and constraints as well. For [f@{}] or
[f@{i j}], the constraints can be extended, no universe introduced, to
maintain compatibility with existing developments. Use [f@{i j | }] to
indicate that no constraint (nor universe) can be introduced. These
kind of definitions could benefit from asynchronous processing.
Declarations of universe binders and constraints also works for
monomorphic definitions.
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When we used to parse to a glob_sort but always give an empty list in
the GType case we can now parse directly to Sorts.family.
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The internal detype function takes an additional arguments dictating
whether it should be eager or lazy.
We introduce a new type of delayed `DAst.t` AST nodes and use it for
`glob_constr`.
Such type, instead of only containing a value, it can contain a lazy
computation too. We use a GADT to discriminate between both uses
statically, so that no delayed terms ever happen to be
marshalled (which would raise anomalies).
We also fix a regression in the test-suite:
Mixing laziness and effects is a well-known hell. Here, an exception
that was raised for mere control purpose was delayed and raised at a
later time as an anomaly. We make the offending function eager.
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This allows to issue a more appropriate message when a notation with a
{ } cannot be defined because of an incompatible level. E.g.:
Notation "{ A } + B" := (sumbool A B) (at level 20).
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(from module List).
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This fixes bug 5650: evar (x : Prop) should not be slow.
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This ensures that the API is self-contained and is, well, an API.
Before this patch, the contents of `API.mli` bore little relation with
what was used by the plugins [example: `Metasyntax` in tacentries.ml].
Many missing types had to be added.
A sanity check of the `API.mli` file can be done with:
`ocamlfind ocamlc -rectypes -package camlp5 -I lib API/API.mli`
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I.e., do not set local flag to false when in a section since
compatibility tells discharge of hints is not supported.
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In the previous setting, all plugins/ltac/*.cmxs except ltac_plugin.cmxs
(for instance coretactics.cmxs, g_auto.cmxs, ...) were utterly bogus :
- wrong -for-pack used for their inner .cmx
- dependency over modules not provided (for instance Tacenv, that ends
up being a submodule of the pack ltac_plugin).
But we were lucky, those files were actually never loaded, thanks to the
several DECLARE PLUGIN inside coretactics and co, that end up in ltac_plugin,
and hence tell Coq that these modules are already known, preventing
any attempt to load them.
Anyway, this commit cleans up this mess (thanks PMP for the help)
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