abstract class Visitor {
  double value;
  visitSomething(Something s);
  Visitor();
GOOD:
abstract class Animation<T> {
  const Animation(this.value);
  double value;
  void addListener(VoidCallback listener);
Usage
To enable the sort_constructors_first rule,
add sort_constructors_first under linter > rules in your
analysis_options.yaml
file:
linter:
  rules:
    - sort_constructors_first
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