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This PR adds basic support for the Rocq prover version 9.0.

We still use the coqc, coqtop, etc, command-line tools, relying on the Coq 9.0 compatibility layer.

The main change is the explicit prefixing of imports from the standard library with From Coq. At some later point this will become From Stdlib, but right now this would break compatibility with Coq 8.

@xavierleroy xavierleroy force-pushed the coq-9.0 branch 2 times, most recently from 4c522af to 9a18217 Compare March 21, 2025 16:15
@xavierleroy
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CI action latest not yet updated to use 9.0, see rocq-community/docker-rocq#10 .

@xavierleroy
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The docker situation was resolved (thanks @erikmd !), so the latest CI action now uses Coq/Rocq 9.0.

Works around a strange link-time inconsistency in some cases.
For compatibility with Rocq 9.0.
New Flocq require >= 8.15.
Coq 9.0 is supported.
Warn if Rocq is installed but not Coq.
Coq is now able to extract empty Coq types to empty OCaml types.
This triggers a "unused-case" warning on pattern-matches involving the
`BI_platform` constructor of argument `platform_builtin`,
since the type `platform_builtin` is empty for RISC-V.

This commit simply turns warning "unused-case" (56) off for extracted files.

Note that "unused-case" warning is triggered by pattern-matching cases
that are not reachable for reasons of types.  It concerns mainly GADTs.
The classic, non-type based "redundant-case" warning (11) is
still active.
Rocq 9.0 wants `From Stdlib`, but Coq 8 understands `From Coq`.
Changing `From Coq` to `From Stdlib` later will be easy.
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All tests are positive, so let's merge.

@xavierleroy xavierleroy merged commit b41d5c1 into master May 5, 2025
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@xavierleroy xavierleroy deleted the coq-9.0 branch May 29, 2025 09:44
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2 participants