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We unify information about constants so it is shared among all the
paths [interactive, NI, obligations].
IMHO the current setup looks pretty good, with information split into
a per-constant record `CInfo.t` and variables affecting mutual
definitions at once, which live in `Info.t`.
Main information outside our `Info` record is `opaque`, which is
provided at different moments in several cases.
There are a few nits regarding interactive proofs, which will go away
in the next commits.
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This removes so ad-hoc tuples, and encapsulates the API a bit.
It is a step towards:
- Pushing some `to_constr` from the upper layers to the declare code
itself [which will remove code duplication, in particular making the
interactive / non-interactive path more uniform, and make the API
easier to use]
- Further refactoring of the constant information, as `Recthm.t`
contains almost now what we would call "primitive constant
information"; thus we will be able to distinguish next better between
mutual declarations and single-constant ones.
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When declaring a lemma, the code path is quite different depending on
whether the lemma is inferred to be a mutually-defined lemma or not.
We refactor the code path in declare to reflect that; this will allow
to better organize constant information and to reuse the `Recthm.t`
type in particular.
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Add headers to a few files which were missing them.
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IMHO this functionality doesn't belong in the main code flow of
`Lemmas`, so for now we move it out to its own module, as a principle
to hopefully refactor it more.
We also do some very minor refactoring in `Lemmas`.
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