From: "tompng (tomoya ishida) via ruby-core" <ruby-core@...>
Date: 2023-02-01T15:47:43+00:00
Subject: [ruby-core:112173] [Ruby master Bug#19399] Ripper::Lexer.parse throws NoMethodError error for some input

Issue #19399 has been reported by tompng (tomoya ishida).

----------------------------------------
Bug #19399: Ripper::Lexer.parse throws NoMethodError error for some input
https://bugs.ruby-lang.org/issues/19399

* Author: tompng (tomoya ishida)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-darwin20]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
Ripper::Lexer.paser throws ``undefined method `flatten!' for nil:NilClass (NoMethodError)`` for this input
~~~ruby
require 'ripper'
code = <<~CODE
  a do |b # closing "|" is missing
    <<~C
    C
  end
CODE
Ripper::Lexer.parse code
~~~

~~~
/Users/tomoya/.rbenv/versions/3.2.0/lib/ruby/3.2.0/ripper/lexer.rb:183:in `parse': undefined method `flatten!' for nil:NilClass (NoMethodError)

        result.concat(@buf) until (@buf = []; super(); @buf.flatten!; @buf.empty?)
                                                           ^^^^^^^^^
	from /Users/tomoya/.rbenv/versions/3.2.0/lib/ruby/3.2.0/ripper/core.rb:19:in `parse'
	from -:8:in `<main>'
~~~



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