Imports of cover command

PathSynopsis
bufioPackage bufio implements buffered I/O. It wraps an io.Reader or io.Writer object, creating another object (Reader or Writer) that also implements the interface but provides buffering and some help for textual I/O.
bytesPackage bytes implements functions for the manipulation of byte slices.
cmd/internal/browserPackage browser provides utilities for interacting with users' browsers.
cmd/internal/editPackage edit implements buffered position-based editing of byte slices.
cmd/internal/objabi
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
errorsPackage errors implements functions to manipulate errors.
flagPackage flag implements command-line flag parsing.
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/tokenPackage token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).
html/templatePackage template (html/template) implements data-driven templates for generating HTML output safe against code injection.
ioPackage io provides basic interfaces to I/O primitives.
io/ioutilPackage ioutil implements some I/O utility functions.
logPackage log implements a simple logging package.
mathPackage math provides basic constants and mathematical functions.
osPackage os provides a platform-independent interface to operating system functionality.
os/execPackage exec runs external commands.
pathPackage path implements utility routines for manipulating slash-separated paths.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.
regexpPackage regexp implements regular expression search.
runtimePackage runtime contains operations that interact with Go's runtime system, such as functions to control goroutines.
sortPackage sort provides primitives for sorting slices and user-defined collections.
strconvPackage strconv implements conversions to and from string representations of basic data types.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
text/tabwriterPackage tabwriter implements a write filter (tabwriter.Writer) that translates tabbed columns in input into properly aligned text.