[INFO] updating cached repository https://github.com/ityy/rust_study
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ffeb96194e20dbe47c40f1e8a58f538d2ec6520c
[INFO] checking ityy/rust_study against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fityy%2Frust_study" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ityy/rust_study on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ityy/rust_study
[INFO] removed workspace from git repo https://github.com/ityy/rust_study
[INFO] finished tweaking git repo https://github.com/ityy/rust_study
[INFO] tweaked toml for git repo https://github.com/ityy/rust_study written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/ityy/rust_study already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /workspace/builds/worker-1/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[INFO] the lockfile is outdated, regenerating it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" "+45d050cde277b22a755847338f2acc2c7b834141" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+45d050cde277b22a755847338f2acc2c7b834141" "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] 93c53e1dc5d170b71465d44b7666fcc26b2d90546ba9a6cb445cf4dcbbfd3a2a
[INFO] running `"docker" "start" "-a" "93c53e1dc5d170b71465d44b7666fcc26b2d90546ba9a6cb445cf4dcbbfd3a2a"`
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling cc v1.0.52
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]    Compiling quote v1.0.4
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking backtrace v0.3.46
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling failure_derive v0.1.7
[INFO] [stderr]     Checking serde_json v1.0.52
[INFO] [stderr]     Checking failure v0.1.7
[INFO] [stderr]     Checking rust_study v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]    --> src/b01_the_tao_of_programming/c09_panic_handle/t9_3_2_result.rs:126:64
[INFO] [stderr]     |
[INFO] [stderr] 126 |                         println!("error info:{},cause:{:?}", e.description(), e.source());
[INFO] [stderr]     |                                                                ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]    --> src/b01_the_tao_of_programming/c09_panic_handle/t9_3_2_result.rs:126:64
[INFO] [stderr]     |
[INFO] [stderr] 126 |                         println!("error info:{},cause:{:?}", e.description(), e.source());
[INFO] [stderr]     |                                                                ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]    --> src/b01_the_tao_of_programming/c09_panic_handle/t9_3_2_result.rs:163:58
[INFO] [stderr]     |
[INFO] [stderr] 163 |         Err(e) => println!("error info:{},cause:{:?}", e.description(), e.source()),
[INFO] [stderr]     |                                                          ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.96s
[INFO] running `"docker" "inspect" "93c53e1dc5d170b71465d44b7666fcc26b2d90546ba9a6cb445cf4dcbbfd3a2a"`
[INFO] running `"docker" "rm" "-f" "93c53e1dc5d170b71465d44b7666fcc26b2d90546ba9a6cb445cf4dcbbfd3a2a"`
[INFO] [stdout] 93c53e1dc5d170b71465d44b7666fcc26b2d90546ba9a6cb445cf4dcbbfd3a2a