Escaping of apostrophes has changed in Rust beta, so the Compliance snapshot tests are failing
rust-lang/rust#83079
311 │- " An internet datagram can be marked "don't fragment." Any internet",
311 │+ " An internet datagram can be marked "don't fragment." Any internet",
The tests are currently disabled: https://github.com/awslabs/s2n-quic/blob/a8d76e5d1a88d8043a02693f41958ecf41f36d29/common/compliance/cargo-compliance/src/specification/ietf.rs#L236-L238