Imports of package format

PathSynopsis
bytesPackage bytes implements functions for the manipulation of byte slices.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
go/astPackage ast declares the types used to represent syntax trees for Go packages.
go/parserPackage parser implements a parser for Go source files.
go/printerPackage printer implements printing of AST nodes.
go/tokenPackage token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).
ioPackage io provides basic interfaces to I/O primitives.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.