https://git.ruby-lang.org/ruby.git/commit/?id=5cab86f3b0

From 5cab86f3b0725457be3c50d3cab43b04bea53290 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 22 Feb 2020 00:30:55 +0900
Subject: `Proc` made by `Symbol#to_proc` should be a lambda [Bug #16260]


diff --git a/test/ruby/test_symbol.rb b/test/ruby/test_symbol.rb
index 660f2e1..2e9710e 100644
--- a/test/ruby/test_symbol.rb
+++ b/test/ruby/test_symbol.rb
@@ -153,6 +153,10 @@ class TestSymbol < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_symbol.rb#L153
     end;
   end
 
+  def test_to_proc_lambda?
+    assert_predicate(:itself.to_proc, :lambda?)
+  end
+
   def test_to_proc_call_with_symbol_proc
     first = 1
     bug11594 = "[ruby-core:71088] [Bug #11594] corrupted the first local variable"
-- 
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