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We'd like to handle proofs functionally we thus recommend not to use
printing functions without an explicit context.
We also adapt most of the code, making more explicit where the
printing environment is coming from.
An open task is to refactor some code so we gradually make the
`Pfedit.get_current_context ()` disappear.
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(clause "where" with implicit arguments)
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Addded by c6d9d4fb142ef42634be25b60c0995b541e86629 ["Adding ability to
put any pattern in binders, prefixed by a quote."] its current
placement as well as the hook don't make a lot of sense.
In particular, they prevent parts of Coq working without linking the
parser.
To this purpose, we need to consolidate the `Constrexpr`
utilities. While we are at it we do so and remove the `Topconstr`
module which is fully redundant with `Constrexpr_ops`.
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While we are at it we refactor a few special cases of the helper.
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We improve one step further the heuristics to sort out if a variable
is a notation variable or a named variable.
This allows to support the following which was still failing.
Reserved Notation "# x" (at level 0).
Inductive I {A:Type} := C : # 0 -> I where "# I" := (I = I).
We rely here on the property that a binding variable of same name as a
notation variables is itself considered bound by the notation.
This becomes however to be a bit tricky for sorting out if the
variable has to be output to the glob file or not.
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We do up to `Term` which is the main bulk of the changes.
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This will allow to merge back `Names` with `API.Names`
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This is a first step towards some of the solutions proposed in #6008.
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It should be printed without quotes and it already has its
interpretation function.
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This makes sense here as the main client is `Stdargs`. This helps with
the concerns @herbelin had in
https://github.com/coq/coq/issues/6008#issuecomment-341107793
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4.02.3 has been the minimal OCaml version for a while now.
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This fixes also #5731, #6035, #5364.
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To this extent we factor out the relevant bits to a new file,
ltac_pretype.
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clause of an inductive definitions
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More dependencies / linking fixes.
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This allows e.g. the following to work:
Reserved Notation "* a" (at level 70).
Inductive P {n : nat} : nat -> Prop := c m : *m where "* m" := (P m).
We seize this opportunity to make main calls to Metasyntax to depend
on an arbitrary env rather than on Global.env.
Incidentally, this fixes a little coqdoc bug in classifying the
inductive type referred to in the "where" clause.
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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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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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Conditions for printing 'pat were incomplete.
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Was causing a failure to print recursive binders used twice or more in
the same notation.
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When a proper notation variable occurred only in a recursive pattern
of the notation, the notation was wrongly considered non printable due
(the side effect that function compare_glob_constr and that
mk_glob_constr_eq does not do anymore was indeed done by aux' but
thrown away). This fixes it.
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For instance, we don't want "id@{u}" to be coerced to id, or "?[n]" to "_".
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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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restructuration
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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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- Formerly, notations such as "{ A } + { B }" were typically split
into "{ _ }" and "_ + _". We keep the split only for parsing, which
is where it is really needed, but not anymore for interpretation,
nor printing.
- As a consequence, one notation string can give rise to several
grammar entries, but still only one printing entry.
- As another consequence, "{ A } + { B }" and "A + { B }" must be
reserved to be used, which is after all the natural expectation,
even if the sublevels are constrained.
- We also now keep the information "is ident", "is binder" in the
"key" characterizing the level of a notation.
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(from module List).
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This is a second try at removing the hooks for the legacy xml export
system which can't currently be tested.
It is also not included in the API, so it should either be included in
it or this PR be applied.
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Use the functional interface understand_tcc instead.
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This was already the case, but the API was not exposing this.
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