MetaCoq 1.2 for Coq 8.16

We are happy to announce release 1.2 of the MetaCoq project for Coq 8.16, available both as source and through opam. See the website for a detailed overview of the project, introductory material and related articles and presentations.

The main changes in this new version are (w.r.t. v1.1.1):

• A cleaned-up abstract environment structure for the implementation of the verified type-checker and cleaned-up canonicity and consistency theorems by @tabareau.
• A new quotation library with a work-in-progress proof of Löb's theorem by @JasonGross.
• An integration of the typed erasure phase of the ConCert project by @annenkov and @mattam82. Beware, adaptation of the correctness proof is not finished and it is not integrated in the extracted pipeline of MetaCoq Erase yet.
• Reorganization of the packages, separating plugins from theories by @tabareau.

MetaCoq integrates Template-Coq, a reification and denotation plugin for Coq terms and global declarations, a Template monad for metaprogramming (including the ability to extract these metaprograms to OCaml for efficiency), a formalisation of Coq's calculus PCUIC in Coq, a relatively efficient, sound and complete type checker for PCUIC, a verified type and proof erasure procedure from PCUIC to untyped lambda calculus and a quotation library. MetaCoq provides a low-level interface to develop certified plugins like translations, compilers or tactics in Coq itself.

You can install MetaCoq directly from sources or using opam install coq-metacoq. This release will be included in an upcoming Coq Platform.

The current release includes several subpackages, which can be compiled and installed separately if desired:

• the utils library contains extensions to the standard library (notably for reasoning with All/All-n type-valued predicates) (in directory utils, and as coq-metacoq-utils).
• the common libraries of basic definitions for the abstract syntax trees shared by multiple languages (common, coq-metacoq-common)
• the Template-Coq quoting library and plugin (template-coq / coq-metacoq-template)
• a formalisation of meta-theoretical properties of PCUIC, the calculus underlying Coq (pcuic / coq-metacoq-pcuic)
• a verified equivalence between Template-Coq and PCUIC typing (in directory template-pcuic and as coq-metacoq-template-pcuic)
• a total verified type-checker for Coq (safechecker / coq-metacoq-safechecker), usable inside Coq.
• a plugin interfacing with the extracted type-checker in OCaml, providing the MetaCoq SafeCheck <term> command (safechecker-plugin, coq-metacoq-safechecker-plugin)
• a verified type and proof erasure function for Coq (erasure / coq-metacoq-erasure), usable inside Coq.
• a plugin interfacing with the extracted erasure pipeline in OCaml, providing the MetaCoq Erase <term> command (erasure-plugin, coq-metacoq-erasure-plugin)
• a quoting library, allowing the quotation of terms and type derivations along with associated data structures as ASTs/terms (quotation / coq-metacoq-quotation).
• a set of example translations from Type Theory to Type Theory (translation/ coq-metacoq-translations).

A good place to start are the files demo.v, safechecker_test.v, erasure_test.v in the test-suite directory.

MetaCoq is developed by Abhishek Anand, Danil Annenkov, Jakob Botsch Nielsen, Simon Boulier, Cyril Cohen, Yannick Forster, Jason Gross, Meven Lennon-Bertrand, Kenji Maillard, Gregory Malecha, Matthieu Sozeau, Nicolas Tabareau, and Théo Winterhalter. You are welcome to contribute by opening issues and PRs. A MetaCoq Zulip stream is also available.

The MetaCoq Team

What's Changed

• Add monad_option_map by @JasonGross in https://github.com/MetaCoq/metacoq/pull/774
• Bring back ReflectEq instances in ReflectAst by @JasonGross in https://github.com/MetaCoq/metacoq/pull/782
• Add some template monad mapping utils by @JasonGross in https://github.com/MetaCoq/metacoq/pull/783
• Add Module Type DeclarationTypingSig by @JasonGross in https://github.com/MetaCoq/metacoq/pull/781
• isSort and isArity return bool now by @JasonGross in https://github.com/MetaCoq/metacoq/pull/785
• Move Template.TypingWf.on_option to Template.utils.MCOption.on_some_or_none by @JasonGross in https://github.com/MetaCoq/metacoq/pull/786
• Remove trailing whitespace by @JasonGross in https://github.com/MetaCoq/metacoq/pull/773
• Use match in on_ind_body by @JasonGross in https://github.com/MetaCoq/metacoq/pull/778
• Automatically trim whitespace in vscode by @yforster in https://github.com/MetaCoq/metacoq/pull/788
• Helper combinators and lemmas to typecheck pattern matches by @kyoDralliam in https://github.com/MetaCoq/metacoq/pull/787
• remove direct access to the environment and more compact interface by @tabareau in https://github.com/MetaCoq/metacoq/pull/793
• add abstract_env_leqb_level_n by @tabareau in https://github.com/MetaCoq/metacoq/pull/799
• remove need for abstract_env_ext_wf_universeb by @tabareau in https://github.com/MetaCoq/metacoq/pull/800
• Add weakening_env_cored by @JasonGross in https://github.com/MetaCoq/metacoq/pull/801
• Add hd_error_skipn_iff_In by @JasonGross in https://github.com/MetaCoq/metacoq/pull/803
• make -C erasure/ uninstall no longer builds code first by @JasonGross in https://github.com/MetaCoq/metacoq/pull/805
• simplify abstract_env_is_consistent_correct by @tabareau in https://github.com/MetaCoq/metacoq/pull/807
• notation <# _ #> for quoting programs (global_env + term) by @kyoDralliam in https://github.com/MetaCoq/metacoq/pull/796
• remove the need for leqb_level_n_spec0_gen by @tabareau in https://github.com/MetaCoq/metacoq/pull/814
• make -C safechecker/ uninstall no longer builds code first by @JasonGross in https://github.com/MetaCoq/metacoq/pull/810
• make uninstall no longer builds code first by @JasonGross in https://github.com/MetaCoq/metacoq/pull/811
• make -C pcuic/ uninstall no longer builds code first by @JasonGross in https://github.com/MetaCoq/metacoq/pull/812
• Minor reorganization around extends, fresh_global by @JasonGross in https://github.com/MetaCoq/metacoq/pull/802
• tmFixpoint combinator (without unsetting Guard Checking) by @JasonGross in https://github.com/MetaCoq/metacoq/pull/790
• Turn normalisation into a typeclass by @JasonGross in https://github.com/MetaCoq/metacoq/pull/792
• Add trans_one_inductive_entry by @JasonGross in https://github.com/MetaCoq/metacoq/pull/789
• Trim trailing whitespace, this time enabled instead of disabled by @yforster in https://github.com/MetaCoq/metacoq/pull/795
• use In instead of mem in abstract_env_level_mem_correct by @tabareau in https://github.com/MetaCoq/metacoq/pull/817
• Add (only parsing) to <# x #> notation by @JasonGross in https://github.com/MetaCoq/metacoq/pull/819
• better spec for abstract_env_lookup_correct by @tabareau in https://github.com/MetaCoq/metacoq/pull/820
• Add PCUIC versions of tmQuote and related template monad definitions by @JasonGross in https://github.com/MetaCoq/metacoq/pull/776
• Change specification of declared constant and co by @tabareau in https://github.com/MetaCoq/metacoq/pull/822
• Allow environment weakening to reorder declarations by @JasonGross in https://github.com/MetaCoq/metacoq/pull/816
• Fail if a patch is not applicable by @yforster in https://github.com/MetaCoq/metacoq/pull/818
• Add some more utility lemmas in All_Forall by @JasonGross in https://github.com/MetaCoq/metacoq/pull/821
• Add consistency and normalization and reorganize by @tabareau in https://github.com/MetaCoq/metacoq/pull/825
• add PCUICCasesHelper to be compiled by @kyoDralliam in https://github.com/MetaCoq/metacoq/pull/826
• the main change is reordering of context in urenaming by @tabareau in https://github.com/MetaCoq/metacoq/pull/828
• Add utils and common initial folders and reorganize code and plugins by @tabareau in https://github.com/MetaCoq/metacoq/pull/829
• Named semantics with environments for lambda box by @yforster in https://github.com/MetaCoq/metacoq/pull/832
• Don't use Type inductives for Props by @JasonGross in https://github.com/MetaCoq/metacoq/pull/836
• Allow weakening of typing across different checker configs by @JasonGross in https://github.com/MetaCoq/metacoq/pull/848
• Add some Proof using annotations by @JasonGross in https://github.com/MetaCoq/metacoq/pull/849
• Add WeightedGraphSig by @JasonGross in https://github.com/MetaCoq/metacoq/pull/854
• Add tmLocateModule and tmLocateModType by @JasonGross in https://github.com/MetaCoq/metacoq/pull/855
• Generalize tmExistingInstance across localities by @JasonGross in https://github.com/MetaCoq/metacoq/pull/857
• Fix and generalize module quotation by @JasonGross in https://github.com/MetaCoq/metacoq/pull/856
• Add LevelSetOrdProp by @JasonGross in https://github.com/MetaCoq/metacoq/pull/858
• Add KernameSetOrdProp by @JasonGross in https://github.com/MetaCoq/metacoq/pull/859
• Fix safechecker plugin install by @4ever2 in https://github.com/MetaCoq/metacoq/pull/868
• Bump install-nix-action by @JasonGross in https://github.com/MetaCoq/metacoq/pull/866
• Add .github/dependabot.yml by @JasonGross in https://github.com/MetaCoq/metacoq/pull/867
• fix CI issue by running chown -R coq:coq earlier by @yforster in https://github.com/MetaCoq/metacoq/pull/870
• Rework Progress, Standardization, Canonicity and Consistency by @tabareau in https://github.com/MetaCoq/metacoq/pull/872
• Bump actions/checkout from 2 to 3 by @dependabot in https://github.com/MetaCoq/metacoq/pull/869
• Typed erasure integration by @mattam82 in https://github.com/MetaCoq/metacoq/pull/834
• Add DeclarationTypingSig by @JasonGross in https://github.com/MetaCoq/metacoq/pull/873
• Add {LevelExpr,Constraint}SetOrdProp, LevelExprSetDecide by @JasonGross in https://github.com/MetaCoq/metacoq/pull/863
• Add some utility tactics and decidability properties by @JasonGross in https://github.com/MetaCoq/metacoq/pull/837
• Fix nix CI: erasure needs to come after template-pcuic by @JasonGross in https://github.com/MetaCoq/metacoq/pull/877
• Actually fix dependency order of packages on nix by @JasonGross in https://github.com/MetaCoq/metacoq/pull/891
• Add target to update template-coq _PluginProject.in by @JasonGross in https://github.com/MetaCoq/metacoq/pull/892
• Add modules for the eq decision routines for term and associated constants by @JasonGross in https://github.com/MetaCoq/metacoq/pull/887
• Fix ordering of template-pcuic in cachedMake by @JasonGross in https://github.com/MetaCoq/metacoq/pull/885
• Add template-pcuic as dep of erasure by @JasonGross in https://github.com/MetaCoq/metacoq/pull/884
• Make Monad a cumulative inductive type by @JasonGross in https://github.com/MetaCoq/metacoq/pull/883
• Add Monad instance for identity monad by @JasonGross in https://github.com/MetaCoq/metacoq/pull/881
• Generalize Monad{Basic,}Ast to work in any monad by @JasonGross in https://github.com/MetaCoq/metacoq/pull/880
• Add Set MetaCoq Template Monad Debug by @JasonGross in https://github.com/MetaCoq/metacoq/pull/879
• Also run nix ci on the coq-8.16 branch by @JasonGross in https://github.com/MetaCoq/metacoq/pull/890
• Rename Informative to Subsingleton by @yforster in https://github.com/MetaCoq/metacoq/pull/889
• Decidability of consistent_extension_on by @JasonGross in https://github.com/MetaCoq/metacoq/pull/838
• Add UniverseMap, UniverseMapFact by @JasonGross in https://github.com/MetaCoq/metacoq/pull/882
• Make option_instance universe polymorphic by @JasonGross in https://github.com/MetaCoq/metacoq/pull/893
• Make on_some{,_or_none} universe polymorphic by @JasonGross in https://github.com/MetaCoq/metacoq/pull/896
• Make MonadAst universe polymorphic by @JasonGross in https://github.com/MetaCoq/metacoq/pull/897
• Disambiguate Requires among the MetaCoq modules by @JasonGross in https://github.com/MetaCoq/metacoq/pull/899
• Add MCMSets by @JasonGross in https://github.com/MetaCoq/metacoq/pull/900
• Add Utils.MCFSets for FSets.FMap* utils by @JasonGross in https://github.com/MetaCoq/metacoq/pull/901
• Gallina quotation functions for Template by @JasonGross in https://github.com/MetaCoq/metacoq/pull/894
• rework extraction by @tabareau in https://github.com/MetaCoq/metacoq/pull/902
• Make proofs more robust for eventually making All_Forall polymorphic by @JasonGross in https://github.com/MetaCoq/metacoq/pull/903
• Update descriptions and dependencies of the quotation module by @JasonGross in https://github.com/MetaCoq/metacoq/pull/904
• Populate some early MSets and FSets modules by @JasonGross in https://github.com/MetaCoq/metacoq/pull/905
• Remove some duplicate code in quotation by @JasonGross in https://github.com/MetaCoq/metacoq/pull/906
• Refactor quotation of MSets,FMaps to use MC{MSets,FSets} by @JasonGross in https://github.com/MetaCoq/metacoq/pull/907
• Use a more systematic mangling of universe names by @JasonGross in https://github.com/MetaCoq/metacoq/pull/908
• Finish Gallina quotation to Template, inlcuding TypingWf by @JasonGross in https://github.com/MetaCoq/metacoq/pull/898
• [quotation] Fuse Template Monad loops by @JasonGross in https://github.com/MetaCoq/metacoq/pull/909
• [CI] Add concurrency and cancel-in-progress: true by @JasonGross in https://github.com/MetaCoq/metacoq/pull/910
• [Quotation] Add quote_red by @JasonGross in https://github.com/MetaCoq/metacoq/pull/912
• Remove dead commented code in Quotation by @JasonGross in https://github.com/MetaCoq/metacoq/pull/914
• Add missing tests to test-suite/_CoqProject.in by @JasonGross in https://github.com/MetaCoq/metacoq/pull/915
• Move template-pcuic part of Loader where it belongs by @JasonGross in https://github.com/MetaCoq/metacoq/pull/917
• Add PCUIC.PCUICMonadAst by @JasonGross in https://github.com/MetaCoq/metacoq/pull/918
• [Quotation.ToTemplate] Minor adjustments by @JasonGross in https://github.com/MetaCoq/metacoq/pull/919
• [Quotation.ToTemplate] Remove dead imports by @JasonGross in https://github.com/MetaCoq/metacoq/pull/920
• [PCUIC] Add convenience notations for tInt, tFloat by @JasonGross in https://github.com/MetaCoq/metacoq/pull/921
• Improve performance of PCUIC Template Monad by @JasonGross in https://github.com/MetaCoq/metacoq/pull/922
• Add DirPath{Set,Map} by @JasonGross in https://github.com/MetaCoq/metacoq/pull/923
• [PCUIC] Have isArity return bool by @JasonGross in https://github.com/MetaCoq/metacoq/pull/924
• [Quotation.ToTemplate] Remove dead code by @JasonGross in https://github.com/MetaCoq/metacoq/pull/925
• Add an optimized version of tmBind by @JasonGross in https://github.com/MetaCoq/metacoq/pull/926
• Revert "CI:Add concurrency and cancel-in-progress:true" by @JasonGross in https://github.com/MetaCoq/metacoq/pull/929
• Add example for #926 to test-suite by @JasonGross in https://github.com/MetaCoq/metacoq/pull/927
• Add Trel_sig by @JasonGross in https://github.com/MetaCoq/metacoq/pull/931
• remove one hypothesis in erase_correct_strong by @tabareau in https://github.com/MetaCoq/metacoq/pull/911
• Adjust naming of optimized template monad by @JasonGross in https://github.com/MetaCoq/metacoq/pull/928
• Add conv_pb_leqb by @JasonGross in https://github.com/MetaCoq/metacoq/pull/932
• Fix update-_PluginProject.in target by @JasonGross in https://github.com/MetaCoq/metacoq/pull/934
• Rename level and var by @tabareau in https://github.com/MetaCoq/metacoq/pull/935
• Take 2: Revert "Revert "CI:Add concurrency and cancel-in-progress:true"" by @JasonGross in https://github.com/MetaCoq/metacoq/pull/937
• Add _dep versions of Forall2, All2, etc by @JasonGross in https://github.com/MetaCoq/metacoq/pull/930
• Fix tmOptimizedBind to avoid quadratic blowup by @JasonGross in https://github.com/MetaCoq/metacoq/pull/936
• [Quotation.ToTemplate] Add quote_{All,Forall}2_dep by @JasonGross in https://github.com/MetaCoq/metacoq/pull/938
• Typed Erasure depends on TemplatePCUIC by @JasonGross in https://github.com/MetaCoq/metacoq/pull/941
• Add support for dependency in cumulSpec0_ind_all by @JasonGross in https://github.com/MetaCoq/metacoq/pull/933
• Parameterize reduction in PCUIC quotation with a typeclass by @JasonGross in https://github.com/MetaCoq/metacoq/pull/939
• [Quotation] Swap ordering in quotation for performance by @JasonGross in https://github.com/MetaCoq/metacoq/pull/942
• Update _PluginProject by @JasonGross in https://github.com/MetaCoq/metacoq/pull/943
• [Quotation] Add quotation for some Equations defs by @JasonGross in https://github.com/MetaCoq/metacoq/pull/944
• Gallina Quotation for PCUIC terms and typing by @JasonGross in https://github.com/MetaCoq/metacoq/pull/940
• Update README and create Quotation README by @JasonGross in https://github.com/MetaCoq/metacoq/pull/945
• Change notation for wcbv eval by @yforster in https://github.com/MetaCoq/metacoq/pull/946
• prove canonicity by @tabareau in https://github.com/MetaCoq/metacoq/pull/947
• consistency makes use of canonicity by @tabareau in https://github.com/MetaCoq/metacoq/pull/948

New Contributors

• @JasonGross made their first contribution in https://github.com/MetaCoq/metacoq/pull/774
• @4ever2 made their first contribution in https://github.com/MetaCoq/metacoq/pull/868

Full Changelog: https://github.com/MetaCoq/metacoq/compare/v1.1.1-8.16...v1.2-8.16