// @dart = 2.6
class Subclass extends Superclass {
  bar({alpha, beta}) {}
  foo({beta, alpha}) {}
  namedCallback(callback({int beta, String alpha})) {}
}

class Superclass {
  bar({beta, alpha}) {}
  foo({alpha, beta}) {}
  namedCallback(callback({String alpha, int beta})) {}
}

main() {}
topLevelNamed(beta, alpha, {gamma, delta}) {}
topLevelOptional(beta, alpha, [gamma, delta]) {}