This seems like a bug in Macro.to_string to me - it should print everything out. Could you open a bug report?

This is too related to open a new thread. But when posting before, I wasn’t aware that the problem exists only for maps now. It’s basically the same issue but for maps. Opened a GH issue here:

https://github.com/elixir-lang/elixir/issues/13875

Copying over José’s answer for shortcuts:

The difference here is that maps are not valid AST. We fallback to inspect in Macro.to_string for convenience, because the goal of the macro is mostly debugging, but if you returned that from a macro, Elixir would raise accordingly. In any case, it won’t be formatted accordingly. The correct fix is to call Macro.escapeor build the correct Map ast, as shown in the result of quote do: %{1 => 2, foo: :bar}|

For me, Macro.escape did the trick:

my_map = Map.new(1..51, &{&1, "value"}) |> Macro.escape()

(quote do: unquote(my_map))
|> Macro.to_string()
|> IO.inspect(printable_limit: :infinity)