* vm_core.h (rb_vm_defineclass_type_t),

compile.c (iseq_compile_each), insns.def (defineclass): change the
  meaning of the third operand of defineclass as follows:
    lower 3bits: the type of the defineclass
                   0 = class, 1 = singleton class, 2 = module
    4th bit: a flag represents whether the defineclass is scoped
               0 = not scoped (e.g., class Foo)
	       1 = scoped (e.g., class Bar::Baz)
    5th bit: a flag represents whether the superclass is specified
               0 = not specified (e.g., class Foo)
               1 = specified (e.g., class Bar < Foo)
  If the superclass is specified and is not a class, a TypeError
  should be raised.  [ruby-dev:46747] [Bug #7572]

* test/ruby/test_class.rb: related test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38495 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_class.rb

@@ -299,4 +299,41 @@ class TestClass < Test::Unit::TestCase
     assert_equal 1, m::C
     assert_equal 1, m.m
   end
+
+  def test_invalid_superclass
+    assert_raise(TypeError) do
+      eval <<-EOF
+        class C < nil
+        end
+      EOF
+    end
+
+    assert_raise(TypeError) do
+      eval <<-EOF
+        class C < false
+        end
+      EOF
+    end
+
+    assert_raise(TypeError) do
+      eval <<-EOF
+        class C < true
+        end
+      EOF
+    end
+
+    assert_raise(TypeError) do
+      eval <<-EOF
+        class C < 0
+        end
+      EOF
+    end
+
+    assert_raise(TypeError) do
+      eval <<-EOF
+        class C < ""
+        end
+      EOF
+    end
+  end
 end