[ruby-core:102668] [Ruby master Misc#17662] The heredoc pattern used in tests does not syntax highlight correctly in many editors

Issue #17662 has been updated by xtkoba (Tee KOBAYASHI).


Emacs Ruby Mode behaves well with the current pattern. I wonder why the other editors do not simulate it.

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Misc #17662: The heredoc pattern used in tests does not syntax highlight correctly in many editors
https://bugs.ruby-lang.org/issues/17662#change-90662

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
----------------------------------------
This heredoc pattern
```ruby
    assert_ruby_status([], "#{<<-"begin;"}\n#{<<-'end;'}", bug)
    begin;
      exit("1" == Thread.start(1, &:to_s).value)
    end;
```

completely breaks syntax highlighting in at least:
* GitHub: [there](https://github.com/ruby/ruby/blob/36dde35e029c7a6607e6c674062ce6fc7a51c0bd/test/ruby/test_string.rb#L697) [are](https://github.com/ruby/ruby/blob/36dde35e029c7a6607e6c674062ce6fc7a51c0bd/test/ruby/test_process.rb#L1545) [many](https://github.com/ruby/ruby/blob/565aeb81e0886c835888a425e5d05ed99fb03238/test/ruby/test_thread.rb#L201) [examples](https://github.com/ruby/ruby/blob/36dde35e029c7a6607e6c674062ce6fc7a51c0bd/test/ruby/test_require.rb#L21)
* Atom
* RubyMine (and IntelliJ)
* Likely many more editors based on TextMate grammars

Could another pattern be used in tests inside the ruby/ruby repository (at least for `test/ruby`)?

Due to this issue, it is very annoying and inconvenient to look at/read/investigate many tests.

I think this pattern is also very complicated to understand (and using `;` is quite weird for this).
I suggest to replace it with this obvious and simple pattern many people use:
```ruby
    assert_ruby_status([], <<~'RUBY', bug)
      exit("1" == Thread.start(1, &:to_s).value)
    RUBY
```
This syntax highlights correctly in most (all?) editors, and as an added bonus the code inside the heredoc is also highlighted in some editors (due to the label being `RUBY`).



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