Be careful with ? in generated code #1084

Job	Run time
format	14s
Check Examples	1m 18s
clippy (default-tls)	1m 0s
Docs	1m 9s
clippy (rustls-tls-webpki-roots)	1m 1s
clippy (rustls-tls-native)	1m 3s
Stripe Mock Tests (default-tls)	1m 41s
Test Clients (default-tls)	2m 10s
clippy (async-std-surf)	1m 11s
Stripe Mock Tests (rustls-tls-webpki-roots)	1m 42s
Test Clients (rustls-tls-webpki-roots)	2m 8s
Stripe Mock Tests (rustls-tls-native)	1m 45s
verify-codegen-crate	1m 54s
Test Clients (rustls-tls-native)	2m 13s
Test Clients (async-std-surf)	2m 26s
	22m 55s

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