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.

Stainless 0.9.8 (2023-05-30)

Version 0.9.8 (2023-05-30)

Stainless frontend, library and internals

• Expand Stainless library (#1400, #1402, #1418)
• Improved reporting (#1396, #1410)
• Support for enum case objects (#1384)
• Support require and ensuring message overloads (#1382)
• Make ghost, assert and require arguments by-name (#1364)
• Move equivalence checking to a component (#1378)
• Some improvements to OL and OCBSL based simplifiers (#1380)
• Fix issues #1343, #1214, #1351, #1352, #1353, #1365, #1379, #1389, #1390, #1377, #1349, #1405, #1401

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.

Stainless 0.9.7 (2022-11-21)

Version 0.9.7 (2022-11-21)

General

• The recommended JDK is now JDK 17

Stainless frontend, library and internals

• Improve equivalence checking: function call matching, norm, mkTest (#1294)
• Experimental integration of OL- and OCBSL- based simplifiers (#1315)
• Upgrade to Scala 3.2 (#1317)
• Add verification pipeline summary (#1336)
• Fix issues #1332, #1271, #1333, #731, #1290, #1321, #1322, #1306, #1301, #1302, essentially concerning @opaque and @inlineOnce, imperative phase and tupling.

Build

• Include macOS ScalaZ3 build
• Include SBT Stainless plugin

Stainless 0.9.6 (2022-07-03)

Version 0.9.6 (2022-07-03)

This version is tested using java 1.8

Stainless frontend, library and internals

• Fix issues #1268 #1269 #1270 #1272 #1273 #1274 (#1277)
• Avoid unnecessary capture of PC variables when hoisting functions (#1265)
• Minor fixes (#1260, #1263, #1280, #1292)

GenC

• Annotate unexported function as static (#1261)

Stainless 0.9.5 (2022-05-06)

Version 0.9.5 (2022-05-06)

Stainless frontend, library and internals

• VC checking in parallel (#1247)
  • The parallelism can be specified with -Dparallel=<N> when invoking Stainless
• Fix issue #1159 (#1246)
• Address some issues in the imperative phase (#1245, #1252)

VirtualBox VDI Image

A VirtualBox image with the release and bolts/ repository clone is available for this version, based on TurnKey linux. Usage:

• download (648MB)
• extract the archive using 7zr x stainless-turnkey.7z obtaining a 2GB .vdi file
• set up a VM machine as Linux with enough memory and cores and the previously extracted VDI image as the disk
• boot the machine in VirtualBox
• Quit the console dialog that pops at boot
• log in as root with password neverStainSince2010
• Invoke the script in the home directory for a test run and browse for more examples