gistfile1.txt

class Text : RectWidget, HasSizeInfo {
  [...]
  void setText(string s) {
    provide "recomputes width";

[...]
class LinebreakText : RectWidget, HasSizeInfo {
  [...]
  void make-layout() {
    [...]
    depend Text.setText "recomputes width";
    auto rest = new Text (source.(data, settings));
    [...]
      rest.setText $ str[i .. $].strip();
    }