[INFO] updating cached repository https://github.com/carlosgj94/simple_blockchain
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5f1c49970e56d09ea6fd8e84a1294cb183c7ccbd
[INFO] checking carlosgj94/simple_blockchain against try#85cc1486e1f000dce4bb8e1b3cfab2b654b102a8 for pr-73323
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcarlosgj94%2Fsimple_blockchain" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/carlosgj94/simple_blockchain on toolchain 85cc1486e1f000dce4bb8e1b3cfab2b654b102a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/carlosgj94/simple_blockchain
[INFO] finished tweaking git repo https://github.com/carlosgj94/simple_blockchain
[INFO] tweaked toml for git repo https://github.com/carlosgj94/simple_blockchain written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/carlosgj94/simple_blockchain already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "fetch" "--locked" "--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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 69301a3b814c2e52f0aac604d8c83140ad95067416df72f01331932ec68ef27d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "69301a3b814c2e52f0aac604d8c83140ad95067416df72f01331932ec68ef27d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "69301a3b814c2e52f0aac604d8c83140ad95067416df72f01331932ec68ef27d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69301a3b814c2e52f0aac604d8c83140ad95067416df72f01331932ec68ef27d", kill_on_drop: false }`
[INFO] [stdout] 69301a3b814c2e52f0aac604d8c83140ad95067416df72f01331932ec68ef27d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+85cc1486e1f000dce4bb8e1b3cfab2b654b102a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 68c84abb015fba76505ef27bfc08948198cf5ffd30d4d1df7833bec8574430ff
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "68c84abb015fba76505ef27bfc08948198cf5ffd30d4d1df7833bec8574430ff", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.21
[INFO] [stderr]    Compiling gcc v0.3.43
[INFO] [stderr]     Checking rustc-serialize v0.3.22
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking time v0.1.36
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking simple_blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `hash` is never read
[INFO] [stdout]   --> src/main.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let mut hash = String::new();
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_valid_new_block`
[INFO] [stdout]    --> src/main.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn is_valid_new_block(n_block: Block, p_block: Block) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `hash` is never read
[INFO] [stdout]   --> src/main.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let mut hash = String::new();
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_valid_new_block`
[INFO] [stdout]    --> src/main.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn is_valid_new_block(n_block: Block, p_block: Block) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.17s
[INFO] running `Command { std: "docker" "inspect" "68c84abb015fba76505ef27bfc08948198cf5ffd30d4d1df7833bec8574430ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68c84abb015fba76505ef27bfc08948198cf5ffd30d4d1df7833bec8574430ff", kill_on_drop: false }`
[INFO] [stdout] 68c84abb015fba76505ef27bfc08948198cf5ffd30d4d1df7833bec8574430ff