Error: CRuby < 2.6 does not support macos-arm64. Either use a newer Ruby version or use a macOS image running on amd64, e.g., macos-15-intel. Note that GitHub changed the meaning of macos-latest from macos-12 (amd64) to macos-14 (arm64): https://github.blog/changelog/2024-04-01-macos-14-sonoma-is-generally-available-and-the-latest-macos-runner-image/ If you are using a matrix of Ruby versions, a good solution is to run only < 2.6 on amd64, like so: matrix: ruby: ['2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3'] os: [ ubuntu-latest, macos-latest ] # CRuby < 2.6 does not support macos-arm64, so test those on amd64 instead exclude: - { os: macos-latest, ruby: '2.4' } - { os: macos-latest, ruby: '2.5' } include: - { os: macos-15-intel, ruby: '2.4' } - { os: macos-15-intel, ruby: '2.5' } But of course you should consider dropping support for these long-EOL Rubies, which cannot even be built on recent macOS machines. at validateRubyEngineAndVersion (/Users/runner/work/_actions/ruby/setup-ruby/v1/dist/index.js:92670:11) at setupRuby (/Users/runner/work/_actions/ruby/setup-ruby/v1/dist/index.js:92560:15) at run (/Users/runner/work/_actions/ruby/setup-ruby/v1/dist/index.js:92518:11) at /Users/runner/work/_actions/ruby/setup-ruby/v1/dist/index.js:92722:40 at /Users/runner/work/_actions/ruby/setup-ruby/v1/dist/index.js:92724:3 at Object.<anonymous> (/Users/runner/work/_actions/ruby/setup-ruby/v1/dist/index.js:92727:12) at Module._compile (node:internal/modules/cjs/loader:1871:14) at Object..js (node:internal/modules/cjs/loader:2002:10) at Module.load (node:internal/modules/cjs/loader:1594:32) at Module._load (node:internal/modules/cjs/loader:1396:12)

Error: TruffleRuby does not currently support Windows. at validateRubyEngineAndVersion (D:\a\_actions\ruby\setup-ruby\v1\dist\index.js:92689:11) at setupRuby (D:\a\_actions\ruby\setup-ruby\v1\dist\index.js:92560:15) at run (D:\a\_actions\ruby\setup-ruby\v1\dist\index.js:92518:11) at D:\a\_actions\ruby\setup-ruby\v1\dist\index.js:92722:40 at D:\a\_actions\ruby\setup-ruby\v1\dist\index.js:92724:3 at Object.<anonymous> (D:\a\_actions\ruby\setup-ruby\v1\dist\index.js:92727:12) at Module._compile (node:internal/modules/cjs/loader:1871:14) at Object..js (node:internal/modules/cjs/loader:2002:10) at Module.load (node:internal/modules/cjs/loader:1594:32) at Module._load (node:internal/modules/cjs/loader:1396:12)

Process completed with exit code 1.

NoMethodError: undefined method `match?' for /\/(?:lib\/test\/|core_assertions\.rb:)/:Regexp /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/lib/core_assertions.rb:21:in `block in filter' /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/lib/core_assertions.rb:20:in `each' /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/lib/core_assertions.rb:20:in `filter' /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/lib/core_assertions.rb:38:in `filter_backtrace' /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/test/test_core_assertions.rb:19:in `test_backtrace_filter_removes_internal_entries'

Process completed with exit code 1.

<["/home/runner/.rubies/truffleruby-34.0.1/bin/truffleruby", "--version"]> expected but was <nil>.

Process completed with exit code 1.

Process completed with exit code 1.

<["/Users/runner/.rubies/truffleruby-34.0.1/bin/truffleruby", "--version"]> expected but was <nil>.

Process completed with exit code 1.

Process completed with exit code 1.

NoMethodError: undefined method 'split' for nil /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/lib/find_executable.rb:6:in 'find_executable' /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/test/test_find_executable.rb:24:in 'test_find_executable_returns_nil_for_unknown_command' org/jruby/RubyKernel.java:1604:in 'catch' org/jruby/RubyKernel.java:1599:in 'catch' org/jruby/RubyArrayNative.java:1729:in 'each' org/jruby/RubyArrayNative.java:1729:in 'each' org/jruby/RubyKernel.java:1604:in 'catch' org/jruby/RubyKernel.java:1599:in 'catch'

NoMethodError: undefined method 'split' for nil /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/lib/find_executable.rb:6:in 'find_executable' /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/test/test_find_executable.rb:14:in 'test_find_executable_returns_command_and_arguments' org/jruby/RubyKernel.java:1604:in 'catch' org/jruby/RubyKernel.java:1599:in 'catch' org/jruby/RubyArrayNative.java:1729:in 'each' org/jruby/RubyArrayNative.java:1729:in 'each' org/jruby/RubyKernel.java:1604:in 'catch' org/jruby/RubyKernel.java:1599:in 'catch'

Process completed with exit code 1.

NoMethodError: undefined method 'split' for nil /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/lib/find_executable.rb:6:in 'find_executable' /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/test/test_find_executable.rb:24:in 'test_find_executable_returns_nil_for_unknown_command' org/jruby/RubyKernel.java:1598:in 'catch' org/jruby/RubyKernel.java:1593:in 'catch' org/jruby/RubyArrayNative.java:1729:in 'each' org/jruby/RubyArrayNative.java:1729:in 'each' org/jruby/RubyKernel.java:1598:in 'catch' org/jruby/RubyKernel.java:1593:in 'catch'

NoMethodError: undefined method 'split' for nil /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/lib/find_executable.rb:6:in 'find_executable' /home/runner/work/test-unit-ruby-core/test-unit-ruby-core/test/test_find_executable.rb:14:in 'test_find_executable_returns_command_and_arguments' org/jruby/RubyKernel.java:1598:in 'catch' org/jruby/RubyKernel.java:1593:in 'catch' org/jruby/RubyArrayNative.java:1729:in 'each' org/jruby/RubyArrayNative.java:1729:in 'each' org/jruby/RubyKernel.java:1598:in 'catch' org/jruby/RubyKernel.java:1593:in 'catch'

Process completed with exit code 1.

NoMethodError: undefined method `match?' for /\/(?:lib\/test\/|core_assertions\.rb:)/:Regexp D:/a/test-unit-ruby-core/test-unit-ruby-core/lib/core_assertions.rb:21:in `block in filter' D:/a/test-unit-ruby-core/test-unit-ruby-core/lib/core_assertions.rb:20:in `each' D:/a/test-unit-ruby-core/test-unit-ruby-core/lib/core_assertions.rb:20:in `filter' D:/a/test-unit-ruby-core/test-unit-ruby-core/lib/core_assertions.rb:38:in `filter_backtrace' D:/a/test-unit-ruby-core/test-unit-ruby-core/test/test_core_assertions.rb:19:in `test_backtrace_filter_removes_internal_entries'

Process completed with exit code 1.