[INFO] cloning repository https://github.com/thjwhite/rust_playing
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/thjwhite/rust_playing" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthjwhite%2Frust_playing"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthjwhite%2Frust_playing'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1e2bd18631ec2ac6ccfd4e0e9df811bf8065a3d1
[INFO] checking thjwhite/rust_playing against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fthjwhite%2Frust_playing" "/workspace/builds/worker-10/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/thjwhite/rust_playing on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/thjwhite/rust_playing
[INFO] finished tweaking git repo https://github.com/thjwhite/rust_playing
[INFO] tweaked toml for git repo https://github.com/thjwhite/rust_playing written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/thjwhite/rust_playing already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /workspace/builds/worker-10/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] eba7963e16c0ee3a35cbcdbb0f1c5239d19d9aee793f287b51bc3dec45a066d2
[INFO] running `"docker" "start" "-a" "eba7963e16c0ee3a35cbcdbb0f1c5239d19d9aee793f287b51bc3dec45a066d2"`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]     Checking bitflags v0.4.0
[INFO] [stderr]     Checking bytes v0.3.0
[INFO] [stderr]     Checking slab v0.1.3
[INFO] [stderr]     Checking net2 v0.2.34
[INFO] [stderr]     Checking nix v0.5.1
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling ws2_32-sys v0.2.1
[INFO] [stderr]     Checking miow v0.1.5
[INFO] [stderr]     Checking mio v0.5.1
[INFO] [stderr]     Checking memrustd v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `event_loop`
[INFO] [stderr]   --> src/main.rs:45:24
[INFO] [stderr]    |
[INFO] [stderr] 45 |                        event_loop: &mut mio::EventLoop<Server>) -> std::io::Result<()> {
[INFO] [stderr]    |                        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_event_loop`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `event_loop`
[INFO] [stderr]   --> src/main.rs:72:24
[INFO] [stderr]    |
[INFO] [stderr] 72 |                        event_loop: &mut mio::EventLoop<Server>) -> std::io::Result<()> {
[INFO] [stderr]    |                        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_event_loop`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `event_loop`
[INFO] [stderr]   --> src/main.rs:45:24
[INFO] [stderr]    |
[INFO] [stderr] 45 |                        event_loop: &mut mio::EventLoop<Server>) -> std::io::Result<()> {
[INFO] [stderr]    |                        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_event_loop`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `event_loop`
[INFO] [stderr]   --> src/main.rs:72:24
[INFO] [stderr]    |
[INFO] [stderr] 72 |                        event_loop: &mut mio::EventLoop<Server>) -> std::io::Result<()> {
[INFO] [stderr]    |                        ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_event_loop`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `LruEntry`
[INFO] [stderr]  --> src/lru.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct LruEntry<T> {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `LruCache`
[INFO] [stderr]   --> src/lru.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | struct LruCache<T> {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/lru.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn new() -> LruCache<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get`
[INFO] [stderr]   --> src/lru.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn get(&mut self, key: String) -> Result<Arc<RefCell<LruEntry<T>>>, Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `insert`
[INFO] [stderr]   --> src/lru.rs:59:5
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn insert(&mut self, key: String, data: T) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `close_gap`
[INFO] [stderr]   --> src/lru.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     fn close_gap(&mut self, entry: Arc<RefCell<LruEntry<T>>>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `remove`
[INFO] [stderr]    --> src/lru.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 |     fn remove(&mut self, key: String) -> Result<Arc<RefCell<LruEntry<T>>>, Error> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `interest`
[INFO] [stderr]   --> src/main.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     interest: mio::EventSet,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:59:21
[INFO] [stderr]    |
[INFO] [stderr] 59 |                     self.out_buf.write_all(self.in_buf.get_ref());
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:191:21
[INFO] [stderr]     |
[INFO] [stderr] 191 |                     event_loop.deregister(&conn.socket);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:233:21
[INFO] [stderr]     |
[INFO] [stderr] 233 |                     self.connections[event_token].handle_readable(event_loop);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:238:21
[INFO] [stderr]     |
[INFO] [stderr] 238 |                     self.connections[event_token].handle_writable(event_loop);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:250:5
[INFO] [stderr]     |
[INFO] [stderr] 250 |     event_loop.register(&server, SERVER, mio::EventSet::readable(), mio::PollOpt::edge());
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:253:5
[INFO] [stderr]     |
[INFO] [stderr] 253 |     event_loop.run(&mut Server::new(server));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 16 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `LruEntry`
[INFO] [stderr]  --> src/lru.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct LruEntry<T> {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `LruCache`
[INFO] [stderr]   --> src/lru.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | struct LruCache<T> {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/lru.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn new() -> LruCache<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get`
[INFO] [stderr]   --> src/lru.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn get(&mut self, key: String) -> Result<Arc<RefCell<LruEntry<T>>>, Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `insert`
[INFO] [stderr]   --> src/lru.rs:59:5
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn insert(&mut self, key: String, data: T) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `close_gap`
[INFO] [stderr]   --> src/lru.rs:84:5
[INFO] [stderr]    |
[INFO] [stderr] 84 |     fn close_gap(&mut self, entry: Arc<RefCell<LruEntry<T>>>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `remove`
[INFO] [stderr]    --> src/lru.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 |     fn remove(&mut self, key: String) -> Result<Arc<RefCell<LruEntry<T>>>, Error> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `interest`
[INFO] [stderr]   --> src/main.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     interest: mio::EventSet,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:59:21
[INFO] [stderr]    |
[INFO] [stderr] 59 |                     self.out_buf.write_all(self.in_buf.get_ref());
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:191:21
[INFO] [stderr]     |
[INFO] [stderr] 191 |                     event_loop.deregister(&conn.socket);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:233:21
[INFO] [stderr]     |
[INFO] [stderr] 233 |                     self.connections[event_token].handle_readable(event_loop);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:238:21
[INFO] [stderr]     |
[INFO] [stderr] 238 |                     self.connections[event_token].handle_writable(event_loop);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:250:5
[INFO] [stderr]     |
[INFO] [stderr] 250 |     event_loop.register(&server, SERVER, mio::EventSet::readable(), mio::PollOpt::edge());
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:253:5
[INFO] [stderr]     |
[INFO] [stderr] 253 |     event_loop.run(&mut Server::new(server));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 16 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.10s
[INFO] running `"docker" "inspect" "eba7963e16c0ee3a35cbcdbb0f1c5239d19d9aee793f287b51bc3dec45a066d2"`
[INFO] running `"docker" "rm" "-f" "eba7963e16c0ee3a35cbcdbb0f1c5239d19d9aee793f287b51bc3dec45a066d2"`
[INFO] [stdout] eba7963e16c0ee3a35cbcdbb0f1c5239d19d9aee793f287b51bc3dec45a066d2