Compiler enters infinite loop when class extends itself

[romdotdog]

Code

class Foo extends Foo {
  bar(): void {}
}

Strangely if you omit the void return type like this

class Foo extends Foo {
  bar() {}
}

only the AS playground enters an infinite loop while the main branch just exits with a parse error

  ERROR TS1110: Type expected.

     bar() {}
          ^
   in test.ts(2,8)