[INFO] updating cached repository https://github.com/jxilt/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] [stderr] From https://github.com/jxilt/blockchain
[INFO] [stderr]    4dc1cc7..7c2dc1d  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7c2dc1d19fb9706f282e6f94ffcb7ed0c074f016
[INFO] checking jxilt/blockchain against try#e2aab98dd8975a0990f9fbb79b3ea4b40559a184 for pr-72493
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjxilt%2Fblockchain" "/workspace/builds/worker-14/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jxilt/blockchain on toolchain e2aab98dd8975a0990f9fbb79b3ea4b40559a184
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e2aab98dd8975a0990f9fbb79b3ea4b40559a184" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jxilt/blockchain
[INFO] finished tweaking git repo https://github.com/jxilt/blockchain
[INFO] tweaked toml for git repo https://github.com/jxilt/blockchain written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/jxilt/blockchain already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e2aab98dd8975a0990f9fbb79b3ea4b40559a184" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+e2aab98dd8975a0990f9fbb79b3ea4b40559a184" "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] b6c39291619eeb50edbceb37a35dd65beb66c596b2f143ae43081fee76120d76
[INFO] running `"docker" "start" "-a" "b6c39291619eeb50edbceb37a35dd65beb66c596b2f143ae43081fee76120d76"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/listener.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |         self.sender.send(0);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/listener.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |         self.join_handle.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/listener.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |         self.sender.send(0);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/listener.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |         self.join_handle.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.66s
[INFO] running `"docker" "inspect" "b6c39291619eeb50edbceb37a35dd65beb66c596b2f143ae43081fee76120d76"`
[INFO] running `"docker" "rm" "-f" "b6c39291619eeb50edbceb37a35dd65beb66c596b2f143ae43081fee76120d76"`
[INFO] [stdout] b6c39291619eeb50edbceb37a35dd65beb66c596b2f143ae43081fee76120d76