component WrongMutation {
  let a = "";
  if (true) {
    a := "error!";
  };
  a
}

component ScopeError {
  let a = {
    let local_x = 1;
    let local_y = 2;
    local_x + local_y
  };
  local_x
}

component UnboundIdentifier {
  let two = one;
  two
}