31a6eaabc165d8a222e176f2c809d90622d88ec2 is obsoleted with
  https://github.com/rubygems/rubygems/pull/3820

  Enable Style/EmptyLinesAroundClassBody rubocop cop.

It's very unlikely to hit this case, but it is possible, as
Thread::Backtrace::Location#path can return nil if the location is
a cfunc with no previous iseq.  See location_path in vm_backtrace.c
in Ruby.

https://github.com/rubygems/rubygems/commit/511935645a

* See https://github.com/oracle/truffleruby/issues/2046
* `<internal:` is a common prefix also used by core Ruby files in CRuby.
* test_no_kernel_require_in_*warn_with_uplevel already test this.
* Unfortunately just skipping `<internal:` in the Ruby implementation
  is not enough, because RubyGems' #warn would not skip the
  `<internal:` require (TruffleRuby defines #require in Ruby),
  and the Ruby implementation's #warn would not skip
  RubyGems's #require. The #caller_locations(0) look like this:

  warnee.rb:1:in `<top (required)>' # where #warn is called
  <internal:core> core/kernel.rb:234:in `gem_original_require' # not skipped by RubyGems' warn, skipped by the Ruby impl
  rubygems/core_ext/kernel_require.rb:54:in `require' # not skipped by the Ruby impl's warn, what would be shown without this fix
  warn.rb:1:in `<main>' # what would be correct

  warn.rb is
  require "warnee"
  warnee.rb is
  puts caller_locations(0), nil
  warn "oops", uplevel: 1

https://github.com/rubygems/rubygems/commit/7c838f7419

To normalize the code style with `bundler`.

To make rubygems code style consistent with bundler.