Unparser failing to round-trip dynamic heredoc + block

[dgollahon]

test.rb (slightly minified version of actual code i wrote):

notify(
  <<~MSG
    #{1}
  MSG
) do |report|
  report.something
end

parsed = Unparser.parse(File.read('test.rb')) # works fine

# but it fails the round-trip:
Unparser.unparse_validate(parsed) # => #<Unparser::Either::Left value=#<Unparser::Validation generated_node=#<Unparser::Either::Left value=nil> generated_source=#<Unparser::Either::Left value=nil> identification="(string)" original_node=#<Unparser::Either::Left value=#<Parser::SyntaxError: unterminated string meets end of file>> original_source=#<Unparser::Either::Right value="notify(<<-HEREDOC) {\n\#{1}\nHEREDOC |report|\n  report.something\n}">>>

unparsed output:

notify(<<-HEREDOC) {
#{1}
HEREDOC |report|
  report.something
}

[mbj]

heredocs and the AST around them are the bane of unparser. I need to talk to the parser authors to make the AST more uniform else this is wack a mole.