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The table of coercion classes (`class_tab`) has been extended with information
about reachability. The conversion checking of a pair of multiple inheritance
paths (of coercions) will be skipped if these paths can be reduced to smaller
adjoining pairs of multiple inheritance paths, and this reduction will be
determined based on that reachability information.
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`coe_source` and `coe_target` fields of type `cl_typ` have been added to
`coe_info_typ` so that it allows querying the classes from a `GlobRef.t` of a
coercion. The `coercion` record has also been replaced with `coe_info_typ`.
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The table of coercion classes `class_tab` is now indexed by `cl_typ` instead of
integers (`cl_index`). All the uses of `cl_index` and `Bijint` have been
replaced with `cl_typ` and `ClTypMap` respectively.
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This is similar to Constant and MutInd but for some reason this was was never
done. Such a patch makes the whole API more regular. We also deprecate the
legacy aliases.
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This is extracted from #9710, where we need the environment anyway to compute
iota rules on inductive types with let-bindings. The commit is self-contained,
so I think it could go directly in to save me a few rebases.
Furthermore, this is also related to #11707. Assuming we split cbn from the
other reduction machine, this allows to merge the "local" machine with
the general one, since after this PR they will have the same type. One less
reduction machine should make people happy.
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Reviewed-by: SkySkimmer
Reviewed-by: herbelin
Ack-by: ppedrot
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Add headers to a few files which were missing them.
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We restrict to those that are actually related to typeclasses, and
perform the following renamings:
Classops --> Coercionops
Class --> ComCoercion
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