Ported a bit more of the MRI Module#prepend tests over

Currently kind_of fails miserably, still looking for the reason

test/t/module.rb

@@ -474,7 +474,9 @@ end
 
 # Not ISO specified
 
+# @!group prepend
 assert('Module#prepend') do
+  assert('test_prepend') do
     module M0
       def m1; [:M0] end
     end
@@ -505,7 +507,47 @@ assert('Module#prepend') do
     obj = P1.new
     expected = [:M2,[:M3,[:C1,[:M4,[:M1,[:C0,[:M0],:C0],:M1],:M4],:C1],:M3],:M2]
     assert_equal(expected, obj.m1)
+  end
+
+  # mruby shouldn't be affected by this since there is
+  # no visibility control (yet)
+  assert('test_public_prepend') do
+    assert_nothing_raised('ruby/ruby #8846') do
+      Class.new.prepend(Module.new)
+    end
+  end
+
+  assert('test_prepend_inheritance') do
+    bug6654 = '[ruby-core:45914]'
+    a = Module.new
+    b = Module.new { include a }
+    c = Module.new { prepend b }
+
+    assert bug6654 do
+      # the Module#< operator should be used here instead, but we don't have it
+      assert_include(c.ancestors, a)
+      assert_include(c.ancestors, b)
+    end
+
+    bug8357 = '[ruby-core:54736] [Bug #8357]'
+    b = Module.new { prepend a }
+    c = Class.new { include b }
+
+    assert bug8357 do
+      # the Module#< operator should be used here instead, but we don't have it
+      assert_include(c.ancestors, a)
+      assert_include(c.ancestors, b)
+    end
+
+    bug8357 = '[ruby-core:54742] [Bug #8357]'
+    t_print c.new.kind_of?(b)
+    t_print "\n"
+    t_print [b, b.ancestors, c, c.ancestors].inspect
+    t_print "\n"
+    assert_kind_of(b, c.new, bug8357)
+  end
 end
+# @!endgroup prepend
 
 assert('Module#to_s') do
   module Test4to_sModules