@type t() :: %Spek.EvaluationError{
  __exception__: term(),
  expression: Spek.expression() | nil,
  message: String.t()
}

Struct returned or raised if an authorization check fails.

expression contains the parts of the policy expression that were performed and their results. Depending on the evaluation function used, this may be the complete expression, or only the parts of it that were evaluated until a decision was made.