Why do I get syntax error before: '{'?

Question

While playing with Erlang getting started section I have met bizarre syntax error on trivial use case (simple map initialization). Are there any suggestion why does that happen?

1> #{ "key" => 42}.

• 1: syntax error before: '{'

Details: Erlang R16B03 (erts-5.10.4), Eshell V5.10.4.

Answer 1

Because maps were introduced in Erlang 17.

You have to upgrade your installation or do not use maps.