[INFO] updating cached repository https://github.com/strassl/blockchain
[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] 488351e7bb5d038c1c0f486f64300ae1970eea53
[INFO] checking strassl/blockchain against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstrassl%2Fblockchain" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/strassl/blockchain 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/strassl/blockchain
[INFO] finished tweaking git repo https://github.com/strassl/blockchain
[INFO] tweaked toml for git repo https://github.com/strassl/blockchain written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/strassl/blockchain already has a lockfile, it will not be regenerated
[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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stdout] f33ae5243666db184448c927426863450f8efde496e13b8c291ef8f1a167bba8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "f33ae5243666db184448c927426863450f8efde496e13b8c291ef8f1a167bba8"`
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling gcc v0.3.49
[INFO] [stderr]     Checking utf8-ranges v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.4.1
[INFO] [stderr]     Checking itoa v0.3.1
[INFO] [stderr]     Checking dtoa v0.4.1
[INFO] [stderr]     Checking num-traits v0.1.37
[INFO] [stderr]     Checking log v0.3.8
[INFO] [stderr]     Checking serde v1.0.8
[INFO] [stderr]     Checking thread-id v3.1.0
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking time v0.1.37
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking unreachable v0.1.1
[INFO] [stderr]     Checking thread_local v0.3.3
[INFO] [stderr]     Checking aho-corasick v0.6.3
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking regex v0.2.2
[INFO] [stderr]    Compiling serde_derive_internals v0.15.1
[INFO] [stderr]    Compiling serde_derive v1.0.8
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking serde_json v1.0.2
[INFO] [stderr]     Checking blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: function is never used: `serialize`
[INFO] [stderr]  --> src/chain/serialization.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn serialize(chain: &Chain) -> Vec<u8> {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `deserialize`
[INFO] [stderr]   --> src/chain/serialization.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn deserialize(data: &Vec<u8>) -> Result<Chain, String> {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `deserialize`
[INFO] [stderr]   --> src/main.rs:10:39
[INFO] [stderr]    |
[INFO] [stderr] 10 | use chain::serialization::{serialize, deserialize};
[INFO] [stderr]    |                                       ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `deserialize`
[INFO] [stderr]   --> src/main.rs:10:39
[INFO] [stderr]    |
[INFO] [stderr] 10 | use chain::serialization::{serialize, deserialize};
[INFO] [stderr]    |                                       ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `deserialize`
[INFO] [stderr]   --> src/chain/serialization.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn deserialize(data: &Vec<u8>) -> Result<Chain, String> {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.22s
[INFO] running `"docker" "inspect" "f33ae5243666db184448c927426863450f8efde496e13b8c291ef8f1a167bba8"`
[INFO] running `"docker" "rm" "-f" "f33ae5243666db184448c927426863450f8efde496e13b8c291ef8f1a167bba8"`
[INFO] [stdout] f33ae5243666db184448c927426863450f8efde496e13b8c291ef8f1a167bba8