[INFO] cloning repository https://github.com/phpgoc/single_blockchain_for_learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/phpgoc/single_blockchain_for_learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphpgoc%2Fsingle_blockchain_for_learn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphpgoc%2Fsingle_blockchain_for_learn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d59ef8b5d265085c1fa7ec3e252b149e19dbd9e7
[INFO] checking phpgoc/single_blockchain_for_learn against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fphpgoc%2Fsingle_blockchain_for_learn" "/workspace/builds/worker-29/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-29/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/phpgoc/single_blockchain_for_learn on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/phpgoc/single_blockchain_for_learn
[INFO] finished tweaking git repo https://github.com/phpgoc/single_blockchain_for_learn
[INFO] tweaked toml for git repo https://github.com/phpgoc/single_blockchain_for_learn written to /workspace/builds/worker-29/source/Cargo.toml
[INFO] crate git repo https://github.com/phpgoc/single_blockchain_for_learn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b9db76ae5313f2902b2d732b99fe76ccf996a7d7ed4b283bedb5e414094d66db
[INFO] running `Command { std: "docker" "start" "-a" "b9db76ae5313f2902b2d732b99fe76ccf996a7d7ed4b283bedb5e414094d66db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b9db76ae5313f2902b2d732b99fe76ccf996a7d7ed4b283bedb5e414094d66db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9db76ae5313f2902b2d732b99fe76ccf996a7d7ed4b283bedb5e414094d66db", kill_on_drop: false }`
[INFO] [stdout] b9db76ae5313f2902b2d732b99fe76ccf996a7d7ed4b283bedb5e414094d66db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 65b5d7633b16ddf3d81dec51234e797e723cb50e5bcd3fb2f24bacf420cf39dd
[INFO] running `Command { std: "docker" "start" "-a" "65b5d7633b16ddf3d81dec51234e797e723cb50e5bcd3fb2f24bacf420cf39dd", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking cpufeatures v0.1.5
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]     Checking uint v0.9.1
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking sha2 v0.9.5
[INFO] [stderr]     Checking single_blockchain_for_learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `pre_hash`
[INFO] [stdout]  --> src/structs/mod.rs:7:2
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub(crate) pre_hash: String,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `nonce`
[INFO] [stdout]  --> src/structs/mod.rs:8:2
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub(crate) nonce: usize,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `data`
[INFO] [stdout]  --> src/structs/mod.rs:9:2
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub(crate) data: String,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `hash`
[INFO] [stdout]   --> src/structs/mod.rs:10:2
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub(crate) hash: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `difficulty`
[INFO] [stdout]   --> src/structs/mod.rs:11:2
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub(crate) difficulty: usize
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `pre_hash`
[INFO] [stdout]  --> src/structs/mod.rs:7:2
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub(crate) pre_hash: String,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `nonce`
[INFO] [stdout]  --> src/structs/mod.rs:8:2
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub(crate) nonce: usize,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `data`
[INFO] [stdout]  --> src/structs/mod.rs:9:2
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub(crate) data: String,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `hash`
[INFO] [stdout]   --> src/structs/mod.rs:10:2
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub(crate) hash: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `difficulty`
[INFO] [stdout]   --> src/structs/mod.rs:11:2
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub(crate) difficulty: usize
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.19s
[INFO] running `Command { std: "docker" "inspect" "65b5d7633b16ddf3d81dec51234e797e723cb50e5bcd3fb2f24bacf420cf39dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65b5d7633b16ddf3d81dec51234e797e723cb50e5bcd3fb2f24bacf420cf39dd", kill_on_drop: false }`
[INFO] [stdout] 65b5d7633b16ddf3d81dec51234e797e723cb50e5bcd3fb2f24bacf420cf39dd