v0.10.0

What's Changed

• Update Scala to LARA Dotty 3.8.3 and SBT to 1.12.4 by @mbovel in #1708
• Update inox to 8fc9cf8 by @mbovel in #1709
• Fix compatibility with Scala 3.8 by @mbovel in #1711
• Add a lite version of bolts CI for PRs by @samuelchassot in #1712
• Add contributing documentation by @samuelchassot in #1715
• Add natural deduction test cases and documentation for quantified properties by @vkuncak with @Copilot in #1720
• remove refinement lifting phase by @kasiaMarek in #1717
• Refinement types (no skolems) by @kasiaMarek in #1725
• Refinement pattern matching by @kasiaMarek in #1726
• Add error msg for skolem use by @kasiaMarek in #1727
• feat: support isInstaceOf for base types by @kasiaMarek in #1730
• Make refinement type predicates ghost environments by @samuelchassot in #1729
• bump Scala version to 3.9.0-RC1-bin-20260516-64de706-NIGHTLY by @kasiaMarek in #1732
• Create a sanitize pass that removes QualifierSkolemIndex annotations by @kasiaMarek in #1733
• Bump Scala to scala-3.9.0-RC1-bin-20260522-7039450-NIGHTLY by @kasiaMarek in #1734
• Add a new benchmark for non OOP interfaces by @samuelchassot in #1735
• Enable silent flag for refinement types by default by @kasiaMarek in #1737
• Disallow mutable types in object fields by @samuelchassot in #1739
• Fix a too restrictive check for pure fields in classes by @samuelchassot in #1746
• fix an issue with function closure with refinement types by @kasiaMarek in #1731
• More readable GenC by @vkuncak in #1750
• Add code generation for BitVector/Integer and signedness conversions by @sankalpgambhir in #1751
• Add more lemmas for List in the library by @samuelchassot in #1749
• Add CI workflow to automate releases by @mbovel in #1752
• Release workflow: push only the tag, not the bump commit by @mbovel in #1753
• Exclude upstream org.scala-lang Scala libs from assembled jars by @mbovel in #1754
• Add BitVector <-> Integer to frontend by @samuelchassot in #1755
• Refinement mutation by @samuelchassot in #1758
• Cleanup Main class and build.sbt to remove leftovers of the double frontend setup by @samuelchassot in #1762

New Contributors

• @kasiaMarek made their first contribution in #1717

Full Changelog: v0.9.9.3...v0.10.0

v0.9.9.3

What's Changed

• Add IArray to stainless library by @samuelchassot in #1686
• Fix formal parameters computation in GhostAccessRewriter by @mbovel in #1688
• Fix bugs in classtag elimination found when adapting ZipLex by @samuelchassot in #1691
• Rename IArrays into IArray, and remove an additional @ignore that was breaking def list extraction by @samuelchassot in #1695
• Fix a bug in extraction for method calls with multiple list of arguments by @samuelchassot in #1694
• Add a ghost val in IArray instead of instantiating directly the list by @samuelchassot in #1699
• Add floating point support, attempt 2 by @iswoqqe in #1700
• Update ListMap to match the more advanced version on Bolts by @samuelchassot in #1702
• Add caching lemmas to ListMap by @samuelchassot in #1704

New Contributors

• @iswoqqe made their first contribution in #1700

Full Changelog: v0.9.9.2...v0.9.9.3

v0.9.9.2

What's Changed

• Update readme and dependencies by @sankalpgambhir in #1663
• Move installation and build to docs; clean up tutorial docs by @sankalpgambhir in #1664
• Fix crashing on receiving no input files by @sankalpgambhir in #1666
• Add measures in library by @samuelchassot in #1665
• Consider top-level functions in function call matching by @drganam in #1668
• Fix ghost checker by splitting ghost annotation propagation and checks by @samuelchassot in #1673
• allow ignored fields by @vkuncak in #1675
• Remove fail_if_pull_request_is_draft job by @mbovel in #1679
• Ignore ClassTag parameters by @mbovel in #1678

Full Changelog: v0.9.9.1...v0.9.9.2

Stainless 0.9.9.1 (2025-09-05)

• Scala version is now 3.7.2
• Improved reporting for ExtractionFailed #1620
• Add support for extracting from Tasty #1606
• Add support for pattern alternatives #1627
• Tail recursion elimination for GenC #1626
• Added an axiomatized Exists quantifier #1635
• Disable fancy objects (objects that extend traits) at the extraction level #1643
• Added check files for verification integration tests #1641
• Added PartialInverse and Bijection classes and lemmas in Quantifiers library #1646, #1654
• Equivalence: allow norm to change return type of candidate programs #1658

Full Changelog: v0.9.9.0...v0.9.9.1

Stainless 0.9.9.0 (2024-12-09)

• Scala version is now 3.5.2
• Update to Inox that supports Horn clause solving, epfl-lara/inox#214
• Fix an extraction bug with type synonym definitions (#1595)
• Explicit measures in List library so termination checks are cached
• More properties and methods on lists and sets
• Set considered to have positive polarity (it is finite)
• Internal solver errors are now silent by default

Stainless 0.9.8.9 (2024-10-19)

• Default cache now only stores SHA-256 hash of formulas ( -binary-cache=true for old version) #1593, #1591 fixes #1576
• Scala version is now 3.5.0
• Inox now has a solver for ground assertions based on internal evaluator (Inox #218), called eval
• Opaque Forall and ensures: help higher order contracts (#1567)
• Option --compact also reduces progress messages (#1573)
• Changed CI to use GitHub actions
• Documented a limited use of throw
• CI scripts as part of move to GitHub actions

Stainless 0.9.8.8 (2024-08-22)

Version 0.9.8.8 (2024-08-22)

Stainless frontend, library and internals

• Remove Scala 2 frontend (#1517)
• Transform throw into assert(false) (#1521)
• Add measure transfer for equivalence checking (#1557)
• Add further benchmarks for equivalence checking (#1538, #1554)
• Add SAT Check for precondition (#1548)
• Add various specifications to Stainless library (#1555, #1541)
• Enhance unfold to work on bindings and imperative code as well (#1533)
• Various bug fixes (#1531, #1532)

Build

• Move Inox as a submodule instead of an http dependency (#1520)

Documentation

• Add documentation for codespaces use and link to a sample repo (#1440)

v0.9.8.7: Version 0.9.8.7 (2024-05-06)

Version 0.9.8.7 (2024-05-06)

Stainless frontend, library and internals

• Add stainless.lang.Try allowing for a monadic try construct (#1515)
• Upgrade the Scala 3 frontend to Scala 3.3.3 (#1514 and #1516)
• Avoid rebuilding mutated objects when possible in AntiAliasing (#1507 and #1509)
• Show the ID of the corresponding generated SMT-lib file for each VC in the summary when debug=smt option is enabled (#1508)
• Have isExpressionFresh consider arguments when computing freshness of a function call (#1505)
• Avoid pairwise matching of "external" methods in Equivalence checking mode (#1503)
• Fix in documentation (#1502)
• Add support for exported methods (#1501)
• Fix ImperativeCleanup phase to not clean some unused bindings that should not be removed (#1500)
• Fix a bug in Equivalence checking mode that was considering the wrong preconditions in some cases (#1499)
• Fix type alias of opaque triggering missing dependencies (#1498)
• Add missing dropVCs annotation in AntiAliasing (#1496)
• Relax fallback condition of AntiAliasing handling of Let (#1495)
• Add missing case for Array typeBounds, make private final, fix minor bug in RefinementLifting (#1494)
• Fix MatchError in EffectsAnalyzer leading to a crash in some cases (#1492)
• Fix parametric extension methods (#1490)
• Allow for redundant type checks for pattern matching (#1489)
• Add 'unknown safety' category for Equivalence checkign (#1488)
• Allows for let-binding in tests and output 'expected but got' results in Equivalence checking (#1485)
• Add a tail recursive implementation of map for mutable tail lists as a benchmark (#1484)

Build

• Fix the stainless-cli script (#1486)

Stainless 0.9.8.2 (2023-11-10)

Version 0.9.8.2 (2023-11-10)

Stainless frontend, library and internals

• Add stainless.lang.Cell and stainless.lang.swap, allowing to swap the content of two Cells (#1461)
• Add support for cvc5 (#1444)
• Upgrade the Scala 3 frontend to Scala 3.3 (#1442)
• Upgrade the Scala 2 frontend to Scala 2.13.12 (#1469)
• Support for new Array(len) constructor for primitive types (#1453)
• Remove ensuring clause in ghost elimination (#1454)
• Fix while loops being mistakenly considered as ghost (#1467)
• Fix occasionally incorrect positions (#1447, #1455, #1473, #1477)
• Enforce purity for class invariants (#1475)
• Do not treat inline methods or functions as ghost (#1481)
• Applying some type widening in ReturnElimination to avoid triggering AdtSpecialization (#1466)
• Relax freshness condition and improve aliasing error messages (#1468)

Build

• Upgrade the shipped Z3 version (smt-z3) to 4.12.2 (#1469)
• Add cvc5 1.0.8 to the archive (#1469)
• Add arm64 build for macOS (#1469)
• Add the compiled and source code of the Stainless library to the archive, under lib (#1469)
• Add a stainless-cli script to invoke scala-cli with the library (#1469)
• Rename stainless.sh to stainless (#1469)

Stainless 0.9.8.1 (2023-09-21)

Version 0.9.8.1 (2023-09-21)

Stainless frontend, library and internals

• Fix --watch crashing on compilation error (#1424)
• Expand options for equivalence checking (#1422, #1435)
• Add more info messages (#1425)
• Add further postconditions for indexOf and apply (#1428)
• Documentation updates (#1429, #1434, #1431)
• Fix ghost elimination for GenC (#1433)
• Reorganize some library files and allow for verification without Stainless library (#1436)
• Fix issue #1399

Note on platforms

Our CI and most developer machines run Ubuntu 20 or 22; we use OpenJDK 17. Stainless runs fine on terminal-only Linux installations (without X or Wayland), which makes it easy to deploy in Window Subsystem for Linux on Windows; we recommend WSL with *-linux.zip release file for Windows as well (though *-win.zip should work as well). Use option --solvers=smt-z3 on Mac.