[INFO] cloning repository https://github.com/taztingo/rusty-blockchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/taztingo/rusty-blockchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftaztingo%2Frusty-blockchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftaztingo%2Frusty-blockchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] de90640bf3c7fab9cc43eea8d63aed1ae71edcaf
[INFO] checking taztingo/rusty-blockchain against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftaztingo%2Frusty-blockchain" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/taztingo/rusty-blockchain on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/taztingo/rusty-blockchain
[INFO] finished tweaking git repo https://github.com/taztingo/rusty-blockchain
[INFO] tweaked toml for git repo https://github.com/taztingo/rusty-blockchain written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/taztingo/rusty-blockchain already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e0df37757ae0996b8c742fa2172b39ec609a6a42a1e76f7004cf0d65aa70e6b
[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" "6e0df37757ae0996b8c742fa2172b39ec609a6a42a1e76f7004cf0d65aa70e6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e0df37757ae0996b8c742fa2172b39ec609a6a42a1e76f7004cf0d65aa70e6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e0df37757ae0996b8c742fa2172b39ec609a6a42a1e76f7004cf0d65aa70e6b", kill_on_drop: false }`
[INFO] [stdout] 6e0df37757ae0996b8c742fa2172b39ec609a6a42a1e76f7004cf0d65aa70e6b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4254d12378b5b9892c0825e13e041c0623f9c9e48d4766c25bcebcc9de1a3d77
[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" "4254d12378b5b9892c0825e13e041c0623f9c9e48d4766c25bcebcc9de1a3d77", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling openssl v0.10.31
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]    Compiling openssl-sys v0.9.59
[INFO] [stderr]     Checking crypto-hash v0.3.4
[INFO] [stderr]     Checking rusty-blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `latest`
[INFO] [stdout]   --> src/blockchain.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn latest(&self) -> Option<&Block> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `latest`
[INFO] [stdout]   --> src/blockchain.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn latest(&self) -> Option<&Block> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.85s
[INFO] running `Command { std: "docker" "inspect" "4254d12378b5b9892c0825e13e041c0623f9c9e48d4766c25bcebcc9de1a3d77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4254d12378b5b9892c0825e13e041c0623f9c9e48d4766c25bcebcc9de1a3d77", kill_on_drop: false }`
[INFO] [stdout] 4254d12378b5b9892c0825e13e041c0623f9c9e48d4766c25bcebcc9de1a3d77