Hi, I have a problem with Stream.chunk_while in combination with Enum.at (elixir version is 1.5.1) here is the code: chunk_fun = fn i, [] -> {:cont, [i]} i, chunk -> if rem(i, 2) == 0 do {:cont, Enum.reverse(chunk), [i]} else {:cont, [i | chunk]} end end after_fun …

Enum.at is expecting the Enumerable.reduce to always call the reducer function with two params: the entry and a tuple which it passes through ({:not_found, index}) … however, when a :halt tuple is passed to Stream.chunk_while, it actually calls the after function (3rd parameter to Stream.chunk_while)…