class A1 extends (() => {}) {}
class A2 extends (B = C) {}
class A3 extends (B || C) {}
class A4 extends (B + C) {}
class A5 extends B() {}
class A6 extends class {} {}
class A7 extends (B ? C : D) {}
class A8 extends (new B()) {}
class A9 extends (B, C) {}
class A10 extends ({}) {}
class A11 extends B.C {}
class A12 extends function() {} {}
class A13 extends (void B) {}
class A14 extends (++B) {}

async function f1() {
  class A15 extends (await C) {}
}

function* f2() {
  class A16 extends (yield 1) {}
}