function a<T=i32>(): T {
  return 0;
}
function a<T, U=i32>(): T {
  return 0;
}
function a<T, U=i32, V>(): T {
  return 0;
}
// ERROR 2706: "Required type parameters may not follow optional type parameters." in optional-typeparameters.ts(3,20+1)
