Properly init block type. Add MemoryErrorType.

runtime/builtin_types.go

@@ -82,6 +82,7 @@ var builtinTypes = map[*Type]*builtinTypeInfo{
 	AttributeErrorType:            {global: true},
 	BaseExceptionType:             {init: initBaseExceptionType, global: true},
 	BaseStringType:                {init: initBaseStringType, global: true},
+	BlockType:                     {init: initBlockType},
 	BoolType:                      {init: initBoolType, global: true},
 	BytesWarningType:              {global: true},
 	DeprecationWarningType:        {global: true},
@@ -108,6 +109,7 @@ var builtinTypes = map[*Type]*builtinTypeInfo{
 	ListType:                      {init: initListType, global: true},
 	LongType:                      {init: initLongType, global: true},
 	LookupErrorType:               {global: true},
+	MemoryErrorType:               {global: true},
 	MethodType:                    {init: initMethodType},
 	ModuleType:                    {init: initModuleType},
 	NameErrorType:                 {global: true},