Apply a conservative approach by filtering out results for accesses to
captured nullable values, when there is an (implicit) call to the capturing
callable which is `null`-guarded. For example:
```
bool M(int? i, IEnumerable<int> @is)
{
if (i.HasValue)
return @is.Any(j => j == i.Value); // GOOD
return false;
}
```
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