func(a, b interface{}, s Scope) error {
			return Convert_Slice_byte_To_Slice_byte(a.(*[]byte), b.(*[]byte), s)
		},
	)
	return c
}

// WithConversions returns a Converter that is a copy of c but with the additional
// fns merged on top.
func (c *Converter) WithConversions(fns ConversionFuncs) *Converter {
	copied := *c
	copied.conversionFuncs = c.conversionFuncs.Merge(fns)
	return &copied
}

		t.Fatalf("unexpected error %v", err)
	}

	ext := NewConversionFuncs()
	ext.AddUntyped(
		(*A)(nil), (*B)(nil),
		func(a, b interface{}, s Scope) error {
			return nil
		},
	)
	newc := c.WithConversions(ext)

	a := A{}
	b := B{}
	if err := c.Convert(&a, &b, nil); err == nil || err.Error() != "conversion function should be overridden" {
		t.Errorf("unexpected error: %v", err)
	}