[INFO] cloning repository https://github.com/b-m-f/rust_playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/b-m-f/rust_playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fb-m-f%2Frust_playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fb-m-f%2Frust_playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fd5f5c1e312db99abdf4b07d809f0735db153586
[INFO] checking b-m-f/rust_playground against try#575650af7d7ca88602df28e39d27bf3e456c306e for pr-80579
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fb-m-f%2Frust_playground" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/b-m-f/rust_playground on toolchain 575650af7d7ca88602df28e39d27bf3e456c306e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/b-m-f/rust_playground
[INFO] finished tweaking git repo https://github.com/b-m-f/rust_playground
[INFO] tweaked toml for git repo https://github.com/b-m-f/rust_playground written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/b-m-f/rust_playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0c1582196ef781cf2fb8b0e6005175c32e3fca7751e060d2f6d90d47979e003b
[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" "0c1582196ef781cf2fb8b0e6005175c32e3fca7751e060d2f6d90d47979e003b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0c1582196ef781cf2fb8b0e6005175c32e3fca7751e060d2f6d90d47979e003b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c1582196ef781cf2fb8b0e6005175c32e3fca7751e060d2f6d90d47979e003b", kill_on_drop: false }`
[INFO] [stdout] 0c1582196ef781cf2fb8b0e6005175c32e3fca7751e060d2f6d90d47979e003b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c70ca318b916b05dd32c9f2494f19a7c30dab9bc44a5ee61788073e8a701b6c3
[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" "c70ca318b916b05dd32c9f2494f19a7c30dab9bc44a5ee61788073e8a701b6c3", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]     Checking term v0.4.4
[INFO] [stderr]     Checking fs_examples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `factorial_recursive`
[INFO] [stdout]  --> src/math.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn factorial_recursive(n: i64) -> i64 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `factorial`
[INFO] [stdout]  --> src/math.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn factorial (n: i64) -> i64 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `factorial_recursive`
[INFO] [stdout]  --> src/math.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn factorial_recursive(n: i64) -> i64 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `factorial`
[INFO] [stdout]  --> src/math.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn factorial (n: i64) -> i64 {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.97s
[INFO] running `Command { std: "docker" "inspect" "c70ca318b916b05dd32c9f2494f19a7c30dab9bc44a5ee61788073e8a701b6c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c70ca318b916b05dd32c9f2494f19a7c30dab9bc44a5ee61788073e8a701b6c3", kill_on_drop: false }`
[INFO] [stdout] c70ca318b916b05dd32c9f2494f19a7c30dab9bc44a5ee61788073e8a701b6c3