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@@ -16,6 +16,11 @@ namespace rubinius {
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       return DATA_STRIP_TAG(this);
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     }
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+    // Ruby.primitive :symbol_index
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+    INTEGER index(STATE) {
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+      return Object::i2n(this->index());
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+    }
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+
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     static Symbol* from_index(STATE, size_t index) {
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       return (Symbol*)DATA_APPLY_TAG(index, DATA_TAG_SYMBOL);
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     }

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@@ -70,6 +70,12 @@ class TestSymbol : public CxxTest::TestSuite {
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     TS_ASSERT(!strncmp("blah", str->byte_address(state), 4));
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   }
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+  void test_index() {
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+    Symbol* sym = state->globals.symbols->lookup(state, "blah", 4);
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+
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+    TS_ASSERT_EQUALS(sym->index(state)->n2i(), sym->index());
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+  }
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+
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   void test_to_str() {
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     Symbol* sym = (Symbol*)state->globals.symbols->lookup(state, "blah");
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