Annotate syntax error without require

[schneems]

Currently dead_end works by monkey patching require. This causes confusion and problems as other tools are not expecting this. For example zombocom/derailed_benchmarks#204 and #124. This PR utilizes the new SyntaxError#detailed_message as introduced in ruby/ruby#5516 that will be released in Ruby 3.2.

That means that developers using dead_end with Ruby 3.2+ will experience more consistent behavior.

Limitations

As pointed out in #31 the current version of dead_end only works if the developer requires dead_end and then invokes require.

This behavior is still not fixed for Ruby 3.2+

$ ruby -v
ruby 3.2.0preview1 (2022-04-03 master f801386f0c) [x86_64-darwin20]
$ cat monkeypatch.rb
  SyntaxError.prepend Module.new {
    def detailed_message(highlight: nil, **)
      message = super
      message += "Monkeypatch worked\n"
      message
    end
  }

  # require_relative "bad.rb"
  # Note that i am commenting
  # out the require, but leaving
  # in the monkeypatch
⛄️ 3.2.0 🚀 /tmp
$ cat bad.rb
  def lol_i-am-a-synt^xerror
⛄️ 3.2.0 🚀 /tmp
$ ruby -r./monkeypatch.rb bad.rb
bad.rb:1: syntax error, unexpected '-', expecting ';' or '\n'
  def lol_i-am-a-synt^xerror

Additionally we are still not able to handle the case where a program is streamed to ruby and does not exist on disk:

$ echo "def foo" | ruby

As the SyntaxError does not provide us with the contents of the script.

$ echo "def foo" | ruby
-:1: syntax error, unexpected end-of-input
def foo