From 0ff27c4604c76382767b929818d0c428aa74e9f1 Mon Sep 17 00:00:00 2001
From: ktsj <ktsj@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 2 Jul 2017 10:38:38 +0000
Subject: [PATCH] Symbol#== should be able to be redefined

* vm.c (vm_init_redefined_flag): set redefinition flag for Symbol#==.
  The bug was introduced in r58895.

* test/ruby/test_symbol.rb: test for above.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_symbol.rb | 12 ++++++++++++
 vm.c                     |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/test/ruby/test_symbol.rb b/test/ruby/test_symbol.rb
index e7f3d5a527..ba3256b820 100644
--- a/test/ruby/test_symbol.rb
+++ b/test/ruby/test_symbol.rb
@@ -514,4 +514,16 @@ class TestSymbol < Test::Unit::TestCase
     assert_not_equal sym.to_sym.hash,
                      `#{ruby} -e 'puts #{sym.inspect}.to_sym.hash'`.to_i
   end
+
+  def test_eq_can_be_redefined
+    assert_in_out_err([], <<-RUBY, ["foo"], [])
+      class Symbol
+        def ==(obj)
+          "foo"
+        end
+      end
+
+      puts :a == :a
+    RUBY
+  end
 end
diff --git a/vm.c b/vm.c
index 6ff1d234a3..814f8b6780 100644
--- a/vm.c
+++ b/vm.c
@@ -1576,7 +1576,7 @@ vm_init_redefined_flag(void)
     OP(MULT, MULT), (C(Integer), C(Float));
     OP(DIV, DIV), (C(Integer), C(Float));
     OP(MOD, MOD), (C(Integer), C(Float));
-    OP(Eq, EQ), (C(Integer), C(Float), C(String));
+    OP(Eq, EQ), (C(Integer), C(Float), C(String), C(Symbol));
     OP(Eqq, EQQ), (C(Integer), C(Float), C(Symbol), C(String),
 		   C(NilClass), C(TrueClass), C(FalseClass));
     OP(LT, LT), (C(Integer), C(Float));