code: func matchVariableOrCommand(v variables, token string) string {
  	token = strings.ToLower(token)
  	found := ""
  	for cmd := range pprofCommands {
  		if strings.HasPrefix(cmd, token) {
  			if found != "" {
  				return ""
  			}
  			found = cmd
  		}
  	}
  	for variable := range v {
  		if strings.HasPrefix(variable, token) {
  			if found != "" {
  				return ""
  			}
  			found = variable
  		}
  	}
  	return found
  }
docs: // matchVariableOrCommand attempts to match a string token to the prefix of a Command.