Elixpath.get-exclamation-mark

You're seeing just the function get-exclamation-mark, go back to Elixpath module for more information.
Link to this function

get!(data, path_or_str, default \\ nil, opts \\ [])

Specs

get!(data :: term(), t() | String.t(), default, [Elixpath.Parser.option()]) ::
  term() | default | no_return()
when default: term()

Get single data from nested data structure. Returns default when no match. Raises on error.