Completion doesn't show pattern declared variables on `when`

[FMorschel]

Repro

class A {
  int? weirdName;
}

void f(A a) {
  switch (a) {
    case A(:var weirdName) when wei^:

  }
}

CC @scheglov @bwilkerson

Could this be similar to #61676?

[FMorschel]

I was thinking a bit more about this, and since this works:

My new guess is that the newly declared variables are not being considered available here yet.