/opt/hostedtoolcache/Ruby/2.4.10/x64/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in `require': /opt/hostedtoolcache/Ruby/2.4.10/x64/lib/ruby/gems/2.4.0/gems/test-unit-ruby-core-1.0.15/lib/core_assertions.rb:390: syntax error, unexpected keyword_rescue, expecting keyword_end (SyntaxError)
This output was seen in a failing 2.4 CI run: