[INFO] cloning repository https://github.com/mersinvald/rust-vs-haskell-special-olimpiade
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mersinvald/rust-vs-haskell-special-olimpiade" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmersinvald%2Frust-vs-haskell-special-olimpiade", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmersinvald%2Frust-vs-haskell-special-olimpiade'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a78ecf972533a8a5b47234fd8bf5631dd63c0cd3
[INFO] checking mersinvald/rust-vs-haskell-special-olimpiade against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmersinvald%2Frust-vs-haskell-special-olimpiade" "/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/mersinvald/rust-vs-haskell-special-olimpiade on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mersinvald/rust-vs-haskell-special-olimpiade
[INFO] finished tweaking git repo https://github.com/mersinvald/rust-vs-haskell-special-olimpiade
[INFO] tweaked toml for git repo https://github.com/mersinvald/rust-vs-haskell-special-olimpiade written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/mersinvald/rust-vs-haskell-special-olimpiade already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "rustops/crates-build-env@sha256:e18d859f9e32a1da89bc7b2d7d51e13b57342044d1295d9fc0dd0068c58eb3d1" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f73b3ce6eb7fd330de4eb6161143c086260f26ec4d53d66d0810605bf104f2e4
[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" "f73b3ce6eb7fd330de4eb6161143c086260f26ec4d53d66d0810605bf104f2e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f73b3ce6eb7fd330de4eb6161143c086260f26ec4d53d66d0810605bf104f2e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f73b3ce6eb7fd330de4eb6161143c086260f26ec4d53d66d0810605bf104f2e4", kill_on_drop: false }`
[INFO] [stdout] f73b3ce6eb7fd330de4eb6161143c086260f26ec4d53d66d0810605bf104f2e4
[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" "rustops/crates-build-env@sha256:e18d859f9e32a1da89bc7b2d7d51e13b57342044d1295d9fc0dd0068c58eb3d1" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] cc581e56a536e9578656ddaeaa4b5c1f13a9b9a6a8b44d49366d99bc17bec6bc
[INFO] running `Command { std: "docker" "start" "-a" "cc581e56a536e9578656ddaeaa4b5c1f13a9b9a6a8b44d49366d99bc17bec6bc", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-vs-haskell v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/main.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |         if unsafe { unlikely(flush_predicate) } {
[INFO] [stdout]    |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/main.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |         if unsafe { unlikely(flush_predicate) } {
[INFO] [stdout]    |            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` 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 0.39s
[INFO] running `Command { std: "docker" "inspect" "cc581e56a536e9578656ddaeaa4b5c1f13a9b9a6a8b44d49366d99bc17bec6bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc581e56a536e9578656ddaeaa4b5c1f13a9b9a6a8b44d49366d99bc17bec6bc", kill_on_drop: false }`
[INFO] [stdout] cc581e56a536e9578656ddaeaa4b5c1f13a9b9a6a8b44d49366d99bc17bec6bc