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PlantUML source code.

@startuml
namespace std.iter {
  interface IntoIterator << (T) >>
  {
    + into_iter()
  }

  interface Iterator << (T) >>
  {
    + next()
  }

  interface ExactSizeIterator << (T) >> implements Iterator {
    + len() -> usize
    + is_empty() -> bool
  }

  interface FusedIterator << (T) >> implements Iterator

  struct Empty<T> implements Iterator, ExactSizeIterator

  struct Filter<I, P> implements Iterator

  struct Map<I, F> implements Iterator, ExactSizeIterator
}

namespace std.collections {
  struct HashMap<K, V> implements std.iter.IntoIterator
  struct HashSet<T> implements std.iter.IntoIterator
}

namespace std.vec {
  struct Vec<T> implements std.iter.IntoIterator
}
@enduml