go/src/cmd/go/internal/tool/tool.go

var CmdTool …

var toolN …

// Return whether tool can be expected in the gccgo tool directory.
// Other binaries could be in the same directory so don't
// show those with the 'go tool' command.
func isGccgoTool(tool string) bool { … }

func init() { … }

func runTool(ctx context.Context, cmd *base.Command, args []string) { … }

// listTools prints a list of the available tools in the tools directory.
func listTools() { … }

func impersonateDistList(args []string) (handled bool) { … }