From 72242e69aa7ad1e8ec9c5d7533c3bfd22a16d239 Mon Sep 17 00:00:00 2001
From: toshimaru <me@toshimaru.net>
Date: Thu, 16 Nov 2023 09:18:08 +0900
Subject: [PATCH] [ruby/rdoc] fix: Fix NoMethodError for `tokens_to_s` method

Calling `tokens_to_s` gets an error if `token_stream` is nil:

```
undefined method `compact' for nil:NilClass (NoMethodError)
```

So, fall back to an empty array if `@token_stream` is nil.

https://github.com/ruby/rdoc/commit/452e4a2600
---
 lib/rdoc/token_stream.rb            | 2 +-
 test/rdoc/test_rdoc_token_stream.rb | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/rdoc/token_stream.rb b/lib/rdoc/token_stream.rb
index 8fc6eadd85..1ff4b0d09e 100644
--- a/lib/rdoc/token_stream.rb
+++ b/lib/rdoc/token_stream.rb
@@ -105,7 +105,7 @@ module RDoc::TokenStream
   # Current token stream
 
   def token_stream
-    @token_stream
+    @token_stream || []
   end
 
   ##
diff --git a/test/rdoc/test_rdoc_token_stream.rb b/test/rdoc/test_rdoc_token_stream.rb
index 29c5047fb5..dafbe22323 100644
--- a/test/rdoc/test_rdoc_token_stream.rb
+++ b/test/rdoc/test_rdoc_token_stream.rb
@@ -53,5 +53,14 @@ class TestRDocTokenStream < RDoc::TestCase
     end.new
 
     assert_equal "foo 'bar'", foo.tokens_to_s
+
+    foo = Class.new do
+      include RDoc::TokenStream
+
+      def initialize
+        @token_stream = nil
+      end
+    end.new
+    assert_equal "", foo.tokens_to_s
   end
 end