remove superclass test for classes that do not exist in mruby (core)

test/t/superclass.rb

@@ -13,13 +13,13 @@
   [:Array, :Object, '15.2.12.2'],
   [:Hash, :Object, '15.2.13.2'],
   [:Range, :Object, '15.2.14.2'],
-  [:Regexp, :Object, '15.2.15.2'],
-  [:MatchData, :Object, '15.2.16.2'],
+#  [:Regexp, :Object, '15.2.15.2'],      #No Regexp in mruby core
+#  [:MatchData, :Object, '15.2.16.2'],
   [:Proc, :Object, '15.2.17.2'],
-  [:Struct, :Object, '15.2.18.2'],
-  [:Time, :Object, '15.2.19.2'],
-  [:IO, :Object, '15.2.20.2'],
-  [:File, :IO, '15.2.21.2'],
+#  [:Struct, :Object, '15.2.18.2'],
+#  [:Time, :Object, '15.2.19.2'],
+#  [:IO, :Object, '15.2.20.2'],
+#  [:File, :IO, '15.2.21.2'],
   [:Exception, :Object, '15.2.22.2'],
   [:StandardError, :Exception, '15.2.23.2'],
   [:ArgumentError, :StandardError, '15.2.24.2'],
@@ -28,16 +28,16 @@
   [:RegexpError, :StandardError, '12.2.27.2'],
   [:RuntimeError, :StandardError, '12.2.28.2'],
   [:TypeError, :StandardError, '12.2.29.2'],
-  [:ZeroDivisionError, :StandardError, '12.2.30.2'],
+#  [:ZeroDivisionError, :StandardError, '12.2.30.2'],  # No ZeroDivisionError in mruby
   [:NameError, :StandardError, '15.2.31.2'],
   [:NoMethodError, :NameError, '15.2.32.2'],
   [:IndexError, :StandardError, '15.2.33.2'],
-  [:IOError, :StandardError, '12.2.34.2'],
-  [:EOFError, :IOError, '12.2.35.2'],
-  [:SystemCallError, :StandardError, '15.2.36.2'],
+#  [:IOError, :StandardError, '12.2.34.2'],
+#  [:EOFError, :IOError, '12.2.35.2'],
+#  [:SystemCallError, :StandardError, '15.2.36.2'],
   [:ScriptError, :Exception, '12.2.37.2'],
   [:SyntaxError, :ScriptError, '12.2.38.2'],
-  [:LoadError, :ScriptError, '12.2.39,2'],
+#  [:LoadError, :ScriptError, '12.2.39,2'],
 ].each do |cls, super_cls, iso|
   assert "Direct superclass of #{cls}", iso do
     skip "#{cls} isn't defined" unless Object.const_defined? cls