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Before this patch, this module was a member of the library folder, which had
little to do with its actual use. A tiny part relative to global registering
of universe names has been effectively moved to the Global module.
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The new algorithm produces different sets of arcs than in 8.5, hence
existing developments may fail to pass now because they relied on
the (correct but more approximate) result of minimization in 8.5 which
wasn't insensitive.
The algorithm works bottom-up on the (well-founded) graph to
find lower levels that an upper level can be minimized to. We
filter said lower levels according to the lower sets of the other levels
we consider. If they appear in any of them then we don't need their
constraints. Does not seem to have a huge impact on performance in HoTT,
but this should be evaluated further.
Adapt test-suite files accordingly.
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Suggested by @ppedrot
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As noted by @ppedrot, the first is redundant. The patch is basically a renaming.
We didn't make the component optional yet, but this could happen in a
future patch.
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module)
For the moment, there is an Error module in compilers-lib/ocamlbytecomp.cm(x)a
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This fixes the declarations of constraints, universes
and assumptions:
- global constraints can refer to global universes only,
- polymorphic universes, constraints and assumptions can only be
declared inside sections, when all the section's
variables/universes are polymorphic as well.
- monomorphic assumptions may only be declared in section contexts
which are not parameterized by polymorphic universes/assumptions.
Add fix for part 1 of bug #4816
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Instead of relying on a costly set union, we take advantage of the fact
that instances are small compared to the set of universes.
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Do not substitute rigid variables during minimization, keeping
their equality constraints instead.
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Prop levels.
As they are typed assuming all variables are >= Set now, and this was
breaking an invariant in typing. Only one instance in the standard
library was used in Hurkens, which can be avoided easily. This also
avoids displaying unnecessary >= Set constraints everywhere.
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valid (when Top.i is global and hence > Set).
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Instead of accumulating constraints which are not present in the original
graph, we parametrize the equality function by a function actually merging
those constraints in the current graph. This prevents doing the work twice.
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Keep user-side information on the names used in instances of universe
polymorphic references and use them for printing.
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structure.
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Add a flag to disallow minimization to set
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1. The Univ module now only cares about definitions about universes.
2. The UGraph module contains the algorithm responsible for aciclicity.
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According to their polymorphic/non-polymorphic status, which
imply that universe variables introduced with it are assumed
to be >= or > Set respectively in the following definitions.
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We are forced to declare universes that are global and appear in the
local constraints as we start from an empty universe graph.
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1) We now _assign_ the smallest possible arities to mutual inductive types
and eventually add leq constraints on the user given arities. Remove
useless limitation on instantiating algebraic universe variables with
their least upper bound if they have upper constraints as well.
2) Do not remove non-recursive variables when computing minimal levels of inductives.
3) Avoid modifying user-given arities if not necessary to compute the
minimal level of an inductive.
4) We correctly solve the recursive equations taking into account the
user-declared level.
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Wrong handling of algebraic universes that have upper bounds.
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Some asynchronous constraints between initial universes and the ones at
the end of a proof were forgotten. Also add a message to print universes
indicating if all the constraints are processed already or not.
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Followup of: f7b29094fe7cc13ea475447bd30d9a8b942f0fef . In particular, re-closes #3593.
As a side effect, fixes an undiscovered bug of the `eq_constr` tactic which didn't consider terms up to evar instantiation.
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has a strict upper bound.
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[compare_head_gen] defined in terms of [compare_head_gen_leq]. Remove an unused argument from [compare_head_gen_leq].
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printing functions touched in the kernel).
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inductive types (i.e., ones declared with an explicit anonymous Type
at the conclusion of their arity). With this change one can force
inductives to live in higher universes even in the non-fully universe
polymorphic case (e.g. bug #3821).
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This is a continuation of the previous patch.
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Before this patch opaque tables were only growing, making them unusable
in interactive mode (leak on Undo).
With this patch the opaque tables are functional and part of the env.
I.e. a constant_body can point to the proof term in 2 ways:
1) directly (before the constant is discharged)
2) indirectly, via an int, that is mapped by the opaque table to
the proof term.
This is now consistent in batch/interactive mode
This is step 0 to make an interactive coqtop able to dump a .vo/.vi
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so as to reproduce correctly the reduction behavior of existing
projections, i.e. delta + iota. Make [projection] an abstract datatype
in Names.ml, most of the patch is about using that abstraction.
Fix unification.ml which tried canonical projections too early in
presence of primitive projections.
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projections with their eta-expanded constant form.
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variables.
Simplifies instantiation of constants/inductives, requiring less allocation and Map.find's.
Abstraction by variables is handled mostly inside the kernel but could be moved outside.
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