ktsj	2017-07-02 19:38:38 +0900 (Sun, 02 Jul 2017)

  New Revision: 59250

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59250

  Log:
    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.

  Modified files:
    trunk/test/ruby/test_symbol.rb
    trunk/vm.c
Index: vm.c
===================================================================
--- vm.c	(revision 59249)
+++ vm.c	(revision 59250)
@@ -1576,7 +1576,7 @@ vm_init_redefined_flag(void) https://github.com/ruby/ruby/blob/trunk/vm.c#L1576
     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));
Index: test/ruby/test_symbol.rb
===================================================================
--- test/ruby/test_symbol.rb	(revision 59249)
+++ test/ruby/test_symbol.rb	(revision 59250)
@@ -514,4 +514,16 @@ class TestSymbol < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_symbol.rb#L514
     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

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