https://git.ruby-lang.org/ruby.git/commit/?id=6566919176

From 6566919176834efb47ea717967669ca83eb78347 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 7 Jun 2019 18:45:49 +0900
Subject: ripper_state_lex.rb: chomp CR

* lib/rdoc/parser/ripper_state_lex.rb (RDoc::Parser::RipperStateLex):
  chomp newline, including CR, from here document terminator.

Closes: ruby/rdoc#694
Closes: ruby/rdoc#697
Closes: ruby/rdoc#705

diff --git a/lib/rdoc/parser/ripper_state_lex.rb b/lib/rdoc/parser/ripper_state_lex.rb
index cc7a879..5492f08 100644
--- a/lib/rdoc/parser/ripper_state_lex.rb
+++ b/lib/rdoc/parser/ripper_state_lex.rb
@@ -494,7 +494,8 @@ class RDoc::Parser::RipperStateLex https://github.com/ruby/ruby/blob/trunk/lib/rdoc/parser/ripper_state_lex.rb#L494
   private def heredoc_end?(name, indent, tk)
     result = false
     if :on_heredoc_end == tk[:kind] then
-      tk_name = (indent ? tk[:text].gsub(/^ *(.+)\n?$/, '\1') : tk[:text].gsub(/\n\z/, ''))
+      tk_name = tk[:text].chomp
+      tk_name.lstrip! if indent
       if name == tk_name
         result = true
       end
diff --git a/test/rdoc/test_rdoc_parser_ruby.rb b/test/rdoc/test_rdoc_parser_ruby.rb
index 8188318..97abafc 100644
--- a/test/rdoc/test_rdoc_parser_ruby.rb
+++ b/test/rdoc/test_rdoc_parser_ruby.rb
@@ -2914,6 +2914,21 @@ EXPECTED https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_parser_ruby.rb#L2914
     assert_equal expected, markup_code
   end
 
+  def test_parse_heredoc_end
+    code = "A = <<eos\n""OK\n""eos\n"
+    util_parser code
+    @parser.parse_statements @top_level
+    @parser.scan
+    c = @top_level.classes.first.constants.first
+    assert_equal("A", c.name)
+
+    util_parser code.gsub(/$/, "\r")
+    @parser.parse_statements @top_level
+    @parser.scan
+    c = @top_level.classes.first.constants.first
+    assert_equal("A", c.name)
+  end
+
   def test_parse_statements_method_oneliner_with_regexp
     util_parser <<RUBY
 class Foo
-- 
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