class A // comment 1
  // comment 2
  extends B {}

class A1 extends B {
  // comment1
  // comment2
  // comment3
}

class A2 /* a */ extends B {}
class A3 extends B /* a */ {}
class A4 extends /* a */ B {}

(class A5 // comment 1
  // comment 2
  extends B {});

(class A6 extends B {
  // comment1
  // comment2
  // comment3
});

(class A7 /* a */ extends B {});
(class A8 extends B /* a */ {});
(class A9 extends /* a */ B {});

class a extends b {
  // comment
  constructor() {}
}

class c extends d {
  // comment2
  constructor() {}
}

class C2 // comment
  extends Base
{
  foo() {}
}