From: "naruse (Yui NARUSE) via ruby-core" <ruby-core@...>
Date: 2023-02-07T06:14:28+00:00
Subject: [ruby-core:112254] [Ruby master Bug#19399] Ripper::Lexer.parse throws NoMethodError error for some input

Issue #19399 has been updated by naruse (Yui NARUSE).

Backport changed from 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED to 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE

ruby_3_2 7246cd0081ec845e1407484fca10439e7868880b merged revision(s) fad48fefe19cc282a5b209944244a3713359b47f.

----------------------------------------
Bug #19399: Ripper::Lexer.parse throws NoMethodError error for some input
https://bugs.ruby-lang.org/issues/19399#change-101682

* Author: tompng (tomoya ishida)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-darwin20]
* Backport: 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE
----------------------------------------
`Ripper::Lexer.parse` 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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