https://git.ruby-lang.org/ruby.git/commit/?id=b84b253a69

From b84b253a69537a14e4854e17b6d94ae75c2af050 Mon Sep 17 00:00:00 2001
From: manga_osyo <manga.osyo@g...>
Date: Sun, 17 Jan 2021 04:41:01 +0900
Subject: Fix Ripper with heredoc.


diff --git a/ext/ripper/lib/ripper/lexer.rb b/ext/ripper/lib/ripper/lexer.rb
index 35ef9b0..8222684 100644
--- a/ext/ripper/lib/ripper/lexer.rb
+++ b/ext/ripper/lib/ripper/lexer.rb
@@ -130,6 +130,7 @@ class Ripper https://github.com/ruby/ruby/blob/trunk/ext/ripper/lib/ripper/lexer.rb#L130
       @buf = []
       @stack = []
       super()
+      @buf = @stack.pop unless @stack.empty?
       if raise_errors and !@errors.empty?
         raise SyntaxError, @errors.map(&:message).join(' ;')
       end
diff --git a/test/ripper/test_lexer.rb b/test/ripper/test_lexer.rb
index 9762478..79cb194 100644
--- a/test/ripper/test_lexer.rb
+++ b/test/ripper/test_lexer.rb
@@ -90,6 +90,16 @@ class TestRipper::Lexer < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ripper/test_lexer.rb#L90
     assert_equal expect, Ripper.lex(src).map {|e| e[1]}
   end
 
+  def test_stack_at_on_heredoc_beg
+    src = "a <<b"
+    expect = %I[
+      on_ident
+      on_sp
+      on_heredoc_beg
+    ]
+    assert_equal expect, Ripper.lex(src).map {|e| e[1]}
+  end
+
   def test_slice
     assert_equal "string\#{nil}\n",
       Ripper.slice(%(<<HERE\nstring\#{nil}\nHERE), "heredoc_beg .*? nl $(.*?) heredoc_end", 1)
-- 
cgit v0.10.2


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