IS_INVALID_SOURCE
if (IS_INVALID_SOURCE(whatSource))
if (IS_INVALID_SOURCE(output))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(output))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(source))
if (IS_INVALID_SOURCE(from)) {
if (IS_INVALID_SOURCE(source)) {
if (IS_INVALID_SOURCE(output.source))