Simplify return type sig

pub struct Index(usize);

pub struct Container {
  data: Vec<T>;

impl Container {
  fn enumerate(&self) -> ??? {|(i, x)| ( Index(i), x ))

Now, the generated type is something like Map<Enumerate<Iter<... , but intuitively, I want to use this as a Iter over (Index, T). Is there anyway to express the latter in ??? ? I.e. I only care that it is an Iter that generates (Index, T); I don't care about the detail that it is via Map, Enumerate, Iter.

impl Iterator<Item = (Index, &T)>? Playground.


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