[ruby-core:78708] [Ruby trunk Feature#13047] Use String literal instead of `String#+` for multiline pretty-printing of multiline strings

Issue #13047 has been reported by Fumiaki Matsushima.

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Feature #13047: Use String literal instead of `String#+` for multiline pretty-printing of multiline strings
https://bugs.ruby-lang.org/issues/13047

* Author: Fumiaki Matsushima
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Multiline pretty-printing of multiline strings is introduced. (https://bugs.ruby-lang.org/issues/12664)

~~~ ruby
> pp "bundler.rb"=> "module Bundler\n  BundlerError = Class.new(Exception)\n  def self.setup\n  end\nend\n"
{"bundler.rb"=>
  "module Bundler\n" +
  "  BundlerError = Class.new(Exception)\n" +
  "  def self.setup\n" +
  "  end\n" +
  "end\n"}
~~~

It is awesome but we can use String literal instead of `String#+`:

~~~ ruby
> pp "bundler.rb"=> "module Bundler\n  BundlerError = Class.new(Exception)\n  def self.setup\n  end\nend\n"
{"bundler.rb"=>
  "module Bundler\n" \
  "  BundlerError = Class.new(Exception)\n" \
  "  def self.setup\n" \
  "  end\n" \
  "end\n"}
~~~

It seems that `pp` want to output evaluable snippet but we can override `String#+` so it may not work well.

Non-broken String will be:

~~~ ruby
> pp "bundler.rb"=> "module Bundler\nend\n"
{"bundler.rb"=> "module Bundler\n" "end\n"}
~~~

How do you think?

-------------

I tried to write patch but I can't find a way to append "\" to broken line only by current PP's API.



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