Imports golang.org/x/tools/godoc/static golang.org/x/tools/playground/socket golang.org/x/tools/present golang.org/x/tour/pic golang.org/x/tour/tree golang.org/x/tour/wc Standard library imports go/parser crypto/sha1 html/template bytes encoding/base64 encoding/json flag fmt go/ast go/build go/printer go/token io io/ioutil log net net/http net/url os os/exec path/filepath runtime strings time