Lambda completion on optional parameters not working

[shinayser]

As @pq asked on #40202 (comment) I am opening this issue for provide completion for optional lambda parameters

[pq]

Thanks!

[scheglov]

I believe that the progress over years to suggest named arguments, and separately expression / block closure covers this issue.

class MyFuture {
  MyFuture.delayed(Duration d, {int Function()? operation});
}

void f() {
  MyFuture.delayed(const Duration(), ^);
}