Tab constructor

const Tab({Key key, String text, Widget icon, Widget child })

Creates a material design TabBar tab. At least one of text, icon, and child must be non-null. The text and child arguments must not be used at the same time.

Implementation 

const Tab({
  Key key,
  this.text,
  this.icon,
  this.child,
}) : assert(text != null || child != null || icon != null),
     assert(!(text != null && null != child)), // TODO(goderbauer): https://github.com/dart-lang/sdk/issues/34180
     super(key: key);