[INFO] fetching crate nitrogen 0.1.0...
[INFO] checking nitrogen-0.1.0 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate nitrogen 0.1.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate nitrogen 0.1.0 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate nitrogen 0.1.0
[INFO] finished tweaking crates.io crate nitrogen 0.1.0
[INFO] tweaked toml for crates.io crate nitrogen 0.1.0 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "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] 83b1f9a58d649a506fe804a3139debc77ed3cfa87b2bdd744e9d50d8a3dbd073
[INFO] running `"docker" "start" "-a" "83b1f9a58d649a506fe804a3139debc77ed3cfa87b2bdd744e9d50d8a3dbd073"`
[INFO] [stderr]     Checking inotify v0.7.0
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]     Checking notify v5.0.0-pre.1
[INFO] [stderr]     Checking nitrogen v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:11:64
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn really_complicated_code(a: u8, b: u8) -> Result<u8, Box<Error>> {
[INFO] [stderr]    |                                                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:11:64
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn really_complicated_code(a: u8, b: u8) -> Result<u8, Box<Error>> {
[INFO] [stderr]    |                                                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]   --> src/bin/nitrogen/file_watcher.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | /     loop {
[INFO] [stderr] 16 | |         match rx.recv() {
[INFO] [stderr] 17 | |             Ok(event) => println!("changed: {:?}", event),
[INFO] [stderr] 18 | |             Err(err) => println!("watch error: {:?}", err),
[INFO] [stderr] 19 | |         };
[INFO] [stderr] 20 | |     }
[INFO] [stderr]    | |_____- any code following this expression is unreachable
[INFO] [stderr] 21 | 
[INFO] [stderr] 22 |       Ok(())
[INFO] [stderr]    |       ^^^^^^ unreachable expression
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/nitrogen/server.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         file_watcher::invoke_filewatcher();
[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: unreachable expression
[INFO] [stderr]   --> src/bin/nitrogen/file_watcher.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | /     loop {
[INFO] [stderr] 16 | |         match rx.recv() {
[INFO] [stderr] 17 | |             Ok(event) => println!("changed: {:?}", event),
[INFO] [stderr] 18 | |             Err(err) => println!("watch error: {:?}", err),
[INFO] [stderr] 19 | |         };
[INFO] [stderr] 20 | |     }
[INFO] [stderr]    | |_____- any code following this expression is unreachable
[INFO] [stderr] 21 | 
[INFO] [stderr] 22 |       Ok(())
[INFO] [stderr]    |       ^^^^^^ unreachable expression
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/nitrogen/server.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         file_watcher::invoke_filewatcher();
[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]     Finished dev [unoptimized + debuginfo] target(s) in 2.62s
[INFO] running `"docker" "inspect" "83b1f9a58d649a506fe804a3139debc77ed3cfa87b2bdd744e9d50d8a3dbd073"`
[INFO] running `"docker" "rm" "-f" "83b1f9a58d649a506fe804a3139debc77ed3cfa87b2bdd744e9d50d8a3dbd073"`
[INFO] [stdout] 83b1f9a58d649a506fe804a3139debc77ed3cfa87b2bdd744e9d50d8a3dbd073