Imports of package user

PathSynopsis
errorsPackage errors implements functions to manipulate errors.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
strconvPackage strconv implements conversions to and from string representations of basic data types.
syncPackage sync provides basic synchronization primitives such as mutual exclusion locks.
syscallPackage syscall contains an interface to the low-level operating system primitives.
unsafePackage unsafe contains operations that step around the type safety of Go programs.