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#[derive(Debug, Clone)]
pub enum Error {
  UnknownReference(String),
  UnknownEdge(String, String),
  UnknownId(u64),
  DuplicateReference(String),
  NoPreviousActivity(u64),
  NoNextActivity(u64),
  FmtError(std::fmt::Error),
  FieldNotSet,
  NoActivityId,
}

impl From<std::fmt::Error> for Error {
  fn from(error: std::fmt::Error) -> Self {
    Error::FmtError(error)
  }
}