message: Use expect over unwrap, for panic-in-panic aborts
  ... doesn't help, but it can't hurt either, right?
diff: @@ -682,7 +682,7 @@ impl Execs {
  self.expect_json = Some(
  expected
  .split("\n\n")
  - .map(|obj| obj.parse().unwrap())
  + .map(|line| line.parse().expect("line to be a valid JSON value"))
  .collect(),
  );
  self
  