Ruby 4 - Building failure on RDoc generation

[rainerborene]

I've tried to install ruby locally using asdf:

$ asdf install ruby 4.0.0

Here is the stack trace:

Before reporting this, could you check that the file you're documenting
has proper syntax:

  /home/user/.asdf/installs/ruby/4.0.0/bin/ruby -c lib/rubygems.rb

RDoc is not a full Ruby parser and will fail when fed invalid ruby programs.

The internal error was:

        (TypeError) can't create instance of singleton class

/tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/parser/ripper_state_lex.rb:23:in 'RDoc::Parser::RipperStateLex::InnerStateLex#on_default': can't create instance of singleton class (TypeError)
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.ext/common/ripper/filter.rb:66:in 'block in Ripper::Filter#parse'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.ext/common/ripper/filter.rb:61:in 'Array#each'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.ext/common/ripper/filter.rb:61:in 'Ripper::Filter#parse'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/parser/ripper_state_lex.rb:282:in 'RDoc::Parser::RipperStateLex#initialize'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/parser/ripper_state_lex.rb:287:in 'RDoc::Parser::RipperStateLex.parse'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/parser/ruby.rb:181:in 'RDoc::Parser::Ruby#initialize'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/parser.rb:194:in 'RDoc::Parser.for'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/rdoc.rb:350:in 'RDoc::RDoc#parse_file'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/rdoc.rb:406:in 'block in RDoc::RDoc#parse_files'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/rdoc.rb:404:in 'Array#map'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/rdoc.rb:404:in 'RDoc::RDoc#parse_files'
        from /tmp/ruby-build.20260114000254.815854.Dk6xLt/ruby-4.0.0/.bundle/gems/rdoc-7.0.3/lib/rdoc/rdoc.rb:467:in 'RDoc::RDoc#document'
        from ./tool/rdoc-srcdir:28:in '<main>'

If you need the entire build log, here it is: https://gist.github.com/rainerborene/b154a9943edc3ba93026def0fbc26040

[rainerborene]

I had to run RUBY_CONFIGURE_OPTS=--disable-install-doc asdf install ruby 4.0.0 to successfully install Ruby 4.

After the installation, I tried to run gem rdoc --all and got the same error message (just in a different location) as seen here.

https://gist.github.com/rainerborene/e2820b9fcaa28c8fbbec55c3c4ed7915

Edit: Not sure if this is related but I've got a segmentation fault on Rubocop https://gist.github.com/rainerborene/cd12f1e1730077492114078cc8ce6b94

[hsbt]

Thanks. I filed your issue to https://bugs.ruby-lang.org/issues/21820#note-3

It may be memory issue of Ruby interpreter.