Add missing required features to Cargo.toml for examples (#432)

* Add missing required features to serve-zone example.

* Fix required-features listed in Cargo.toml for the query-zone example.

* Fix required-features listed in Cargo.toml for the client-transports example.

* Echo all run commands to check examples, and exit immediately on error (also ensures a final success doesn't cause previous failures to be ignored).

* Fix required-features listed in Cargo.toml for the server-transports example.

* Remove unused import except when feature is enabled that needs it.

.github/workflows/ci.yml

@@ -110,4 +110,4 @@ jobs:
 
         # Run the temporary script:
 
-        bash ${{ runner.temp }}/check-examples.sh
+        bash -x -e ${{ runner.temp }}/check-examples.sh

Cargo.toml

@@ -121,23 +121,23 @@ required-features = ["std", "rand"]
 
 [[example]]
 name = "client-transports"
-required-features = ["net", "unstable-client-transport"]
+required-features = ["net", "tokio-rustls", "unstable-client-transport"]
 
 [[example]]
 name = "server-transports"
-required-features = ["net", "unstable-server-transport"]
+required-features = ["net", "tokio-stream", "tracing-subscriber", "unstable-client-transport", "unstable-server-transport"]
 
 [[example]]
 name = "read-zone"
 required-features = ["zonefile"]
 
 [[example]]
 name = "query-zone"
-required-features = ["zonefile", "unstable-zonetree"]
+required-features = ["tracing-subscriber", "unstable-zonetree", "zonefile"]
 
 [[example]]
 name = "serve-zone"
-required-features = ["zonefile", "net", "unstable-server-transport", "unstable-zonetree"]
+required-features = ["zonefile", "net", "tokio-stream", "tracing-subscriber", "tsig", "unstable-client-transport", "unstable-server-transport", "unstable-zonetree"]
 
 [[example]]
 name = "ixfr-client"

examples/client-transports.rs

@@ -1,6 +1,7 @@
 /// Using the `domain::net::client` module for sending a query.
 use std::net::{IpAddr, SocketAddr};
 use std::str::FromStr;
+#[cfg(feature = "unstable-validator")]
 use std::sync::Arc;
 use std::time::Duration;
 use std::vec::Vec;