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![proof_stack] is equivalent to the old meaning of ![proof]: the body
has type `pstate:Proof_global.t option -> Proof_global.t option`
The other specifiers are for the following body types:
~~~
![open_proof] `is_ontop:bool -> pstate`
![maybe_open_proof] `is_ontop:bool -> pstate option`
![proof] `pstate:pstate -> pstate`
![proof_opt_query] `pstate:pstate option -> unit`
![proof_query] `pstate:pstate -> unit`
~~~
The `is_ontop` is only used for the warning message when declaring a
section variable inside a proof, we could also just stop warning.
The specifiers look closely related to stm classifiers, but currently
they're unconnected. Notably this means that a ![proof_query] doesn't
have to be classified QUERY.
![proof_stack] is only used by g_rewrite/rewrite whose behaviour I
don't fully understand, maybe we can drop it in the future.
For compat we may want to consider keeping ![proof] with its old
meaning and using some new name for the new meaning. OTOH fixing
plugins to be stricter is easier if we change it as the errors tell us
where it's used.
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Typically instead of [start_proof : ontop:Proof_global.t option -> bla ->
Proof_global.t] we have [start_proof : bla -> Proof_global.pstate] and
the pstate is pushed on the stack by a caller around the
vernacentries/mlg level.
Naming can be a bit awkward, hopefully it can be improved (maybe in a
followup PR).
We can see some patterns appear waiting for nicer combinators, eg in
mlg we often only want to work with the current proof, not the stack.
Behaviour should be similar modulo bugs, let's see what CI says.
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DAG nodes hold now a system state and a parsing state.
The latter is always passed to the parser.
This paves the way to decoupling the effect of commands on the parsing
state and the system state, and hence never force to interpret, say,
Notation.
Handling proof modes is now done explicitly in the STM, not by interpreting
VernacStartLemma.
Similarly Notation execution could be split in two phases in order to obtain a
parsing state without fully executing it (that requires executing all
commands before it).
Co-authored-by: Maxime Dénès <maxime.denes@inria.fr>
Co-authored-by: Emilio Jesus Gallego Arias <e+git@x80.org>
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We group the extension API and datatypes under `Vernacextend`.
This means that the base plugin dependency is now `coq.vernac` from
`coq.stm`.
This is quite important as for example the LSP server won't like to
link the STM in.
LTAC still depends on the STM by means of the ltac_profile part tho.
The next step could be to move the extension point below `Vernacexpr`.
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Unluckily this is the only file that contains a VERNAC EXTEND and no
ARGUMENT EXTEND, which are not handled yet.
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