// Placeholder whose address represents an invalid library.
// We use this instead of NULL or a pointer-int pair because the OS library
// might define 0 or 1 to be "special" handles, such as "search all".
// Placeholder whose address represents an invalid library.
// We use this instead of NULL or a pointer-int pair because the OS library
// might define 0 or 1 to be "special" handles, such as "search all".