go/src/cmd/go/internal/vet/vetflag.go

var vetTool …

func init() { … }

func parseVettoolFlag(args []string) { … }

// vetFlags processes the command line, splitting it at the first non-flag
// into the list of flags and list of packages.
func vetFlags(args []string) (passToVet, packageNames []string) { … }

func exitWithUsage() { … }