When using `with` there are several times I wish I could have reached
deeper into a Map or Keyword list in a single line rather than multiple
fetch statements. Ideally it would work like this:
```
map = %{foo: %{bar: "baz"}}
%{:ok, "bar"} = fetch_in(map, [:foo, :bar])
:error = fetch_in(map, [:foo, :qux])
:error = fetch_in(map, [:bar])
```
If this is OK I can implement it.
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