Imports of package rand

PathSynopsis
internal/godebugPackage godebug makes the settings in the $GODEBUG environment variable available to other packages.
mathPackage math provides basic constants and mathematical functions.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.
sync/atomicPackage atomic provides low-level atomic memory primitives useful for implementing synchronization algorithms.
unsafePackage unsafe contains operations that step around the type safety of Go programs.