extension on int {
  Map<T, U> _dependencyCycle<T, U>(T Function(U) x, U Function(T) y) =>
      throw '';
  T _laterUnnamedParameter<T>(T x, void Function(T) y) => throw '';
  T _unnecessaryDueToExplicitParameterTypeNamed<T>(
          T x, T Function({required T x, required int y}) y) =>
      throw '';
  T _unnecessaryDueToNoDependency<T>(T Function() x, T y) => throw '';
  U _closureAsParameterType<T, U>(T x, U Function(T) y) => throw '';
  U _propagateFromContravariantReturnType<T, U>(
          void Function(T) Function() x, U Function(T) y) =>
      throw '';
  U _propagateToContravariantParameterType<T, U>(
          T Function() x, U Function(void Function(T)) y) =>
      throw '';
  U _propagateToEarlierClosure<T, U>(U Function(T) x, T Function() y) =>
      throw '';
  U _propagateToLaterClosure<T, U>(T Function() x, U Function(T) y) => throw '';
  U _propagateToReturnType<T, U>(T x, U Function(T) y) => throw '';
  V _longDependencyChain<T, U, V>(
          T Function() x, U Function(T) y, V Function(U) z) =>
      throw '';
  void _earlierNamedParameter<T>({required void Function(T) a, required T b}) =>
      throw '';
  void _earlierNamedParameterDependsOnUnnamedParameter<T>(T b,
          {required void Function(T) a}) =>
      throw '';
  void _earlierUnnamedParameter<T>(void Function(T) x, T y) => throw '';
  void _laterNamedParameter<T>({required T a, required void Function(T) b}) =>
      throw '';
  void _laterUnnamedParameterDependsOnNamedParameter<T>(void Function(T) x,
          {required T a}) =>
      throw '';
  void _parenthesized<T>(T x, void Function(T) y) => throw '';
  void _parenthesizedNamed<T>({required T a, required void Function(T) b}) =>
      throw '';
  void _parenthesizedTwice<T>(T x, void Function(T) y) => throw '';
  void _parenthesizedTwiceNamed<T>(
          {required T a, required void Function(T) b}) =>
      throw '';
  void _returnTypeRefersToMultipleTypeVars<T, U>(
          Map<T, U> Function() x, void Function(T) y, void Function(U) z) =>
      throw '';
}

main() {}
testClosureAsParameterType(int i) {}
testDependencyCycle(int i) {}
testEarlierNamedParameter(int i) {}
testEarlierNamedParameterDependsOnUnnamedParameter(int i) {}
testEarlierUnnamedParameter(int i) {}
testLaterNamedParameter(int i) {}
testLaterUnnamedParameter(int i) {}
testLaterUnnamedParameterDependsOnNamedParameter(int i) {}
testLongDependencyChain(int i) {}
testParenthesized(int i) {}
testParenthesizedNamed(int i) {}
testParenthesizedTwice(int i) {}
testParenthesizedTwiceNamed(int i) {}
testPropagateFromContravariantReturnType(int i) {}
testPropagateToContravariantParameterType(int i) {}
testPropagateToEarlierClosure(int i) {}
testPropagateToLaterClosure(int i) {}
testPropagateToReturnType(int i) {}
testReturnTypeRefersToMultipleTypeVars(int i) {}
testUnnecessaryDueToExplicitParameterTypeNamed(int i) {}
testUnnecessaryDueToNoDependency(int i) {}