void DiffByRefType(int indent, InsByRefType type1, InsByRefType type2)
            {
                FormatLabel(Similar, indent, "ByRef");

                indent++;
                DiffType(indent, type1.ElementType, type2.ElementType);
            }
            void FormatByRef(char prefix, int indent, InsByRefType type)
            {
                FormatLabel(prefix, indent, "ByRef");

                indent++;
                FormatType(prefix, indent, type.ElementType);
            }