Sourced from snowballstemmer's changelog.

Snowball 3.1.0 (2026-05-22)

Compiler changes

• Bug fixes:

  • Fix segmentation fault if -syntax is used on a program with no code.

  • Fix segmentation fault on some assignment syntax errors.

  • Fix bug introduced in v3.0.0 with conversion of among starter. If there were any commands after the among in the same command list then the among itself would get lost. Not triggered by any current algorithms.

  • Clear name field when removing dead assignments. This is visible in the syntax tree shown when command line option -syntax is used, but probably doesn't affect anything otherwise.

• Compiler command-line options:

  • Using - for the Snowball source file is now interpreted as stdin.

  • Improve comments generated by -comments to show more details of the corresponding Snowball code (e.g. variable names, arithmetic expressions, and literal strings).

  • Add -coverage option which enables a code coverage feature. So far this tracks which among strings and functions are exercised, and which grouping characters are exercised. !

  • Support -eprefix for all target languages. This is easy to do and provides a way to deal with externals which collide with keywords in the target language. Our build system now uses -eprefix _ for Python to make the stem external non-public (it is called by BaseStemmer method stemWord()) and we no longer hard-code prefixing Python externals with _.

  • Describe more options in --help output.

  • Sort target language options in --help output.

  • The -o option is now optional. If not specified we now write output(s) to the same filename as the first source, but with a different extension (e.g. path/to/english.sbl -> path/to/english.c and path/to/english.h).

  • The -o option can now optionally include an extension so you can now write -c++ -o path/to/foo.cxx instead of -c++ -o path/to/foo, which can be more convenient (e.g. in make rules) and also provides an easy way to

... (truncated)

• 77e07c9 Update for 3.1.0
• 4d37f9c Finalise NEWS entry for 3.1.0
• 2d38e20 make update_version now also updates README.rst
• 1596c74 Go: Fix code generated for non-constant hop
• 34d1214 NEWS: Update draft entry
• 65885b5 finnish: Rename things to match algo description
• 5c05f53 finnish: Accept apostrophe instead of VI
• df25742 JS: Generate simpler code for hop by constant
• 27c9355 Add runtime test of hop/next
• 2508d20 Add test coverage for hop 1->next canonicalisation
• Additional commits viewable in compare view

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)