Environment

• jruby 9.2.0.0 (2.5.0) 2018-05-24 81156a8 OpenJDK 64-Bit Server VM 10.0.1+10 on 10.0.1+10 +jit [linux-x86_64]
• Stock distributed 9.2.0.0 tarball

Expected Behavior

rake in jruby dist should work out of the box

Actual Behavior

# /opt/jruby/bin/rake
Gem::GemNotFoundException: can't find gem rake (>= 0.a) with executable rake
  find_spec_for_exe at /opt/jruby/lib/ruby/stdlib/rubygems.rb:289
  activate_bin_path at /opt/jruby/lib/ruby/stdlib/rubygems.rb:308
             <main> at /opt/jruby/bin/rake:23

the rake.gemspec is missing from the tarball's lib/ruby/gems/shared/specifications/default

All works fine in jruby-9.1.17.0 and that dist contains the gemspec so that rake works.