[INFO] updating cached repository https://github.com/zni/slippy
[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] 9b542d3057a89c105a8e9affb2b5602b4d2263d2
[INFO] checking zni/slippy against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzni%2Fslippy" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zni/slippy on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/zni/slippy
[INFO] finished tweaking git repo https://github.com/zni/slippy
[INFO] tweaked toml for git repo https://github.com/zni/slippy written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/zni/slippy already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "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] 1f4c88417c8a82023ad139beed05075ac3f21b85b4ffc1fd8ad2ea0c4685d616
[INFO] running `"docker" "start" "-a" "1f4c88417c8a82023ad139beed05075ac3f21b85b4ffc1fd8ad2ea0c4685d616"`
[INFO] [stderr]     Checking dirs-sys v0.3.3
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]     Checking dirs v2.0.1
[INFO] [stderr]     Checking rustyline v5.0.0
[INFO] [stderr]     Checking slippy v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `env`
[INFO] [stderr]    --> src/builtins.rs:488:31
[INFO] [stderr]     |
[INFO] [stderr] 488 | pub fn display(list: &[Expr], env: Rc<RefCell<Env>>) -> Result<Expr, &'static str> {
[INFO] [stderr]     |                               ^^^ help: consider prefixing with an underscore: `_env`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `env`
[INFO] [stderr]    --> src/builtins.rs:488:31
[INFO] [stderr]     |
[INFO] [stderr] 488 | pub fn display(list: &[Expr], env: Rc<RefCell<Env>>) -> Result<Expr, &'static str> {
[INFO] [stderr]     |                               ^^^ help: consider prefixing with an underscore: `_env`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.99s
[INFO] running `"docker" "inspect" "1f4c88417c8a82023ad139beed05075ac3f21b85b4ffc1fd8ad2ea0c4685d616"`
[INFO] running `"docker" "rm" "-f" "1f4c88417c8a82023ad139beed05075ac3f21b85b4ffc1fd8ad2ea0c4685d616"`
[INFO] [stdout] 1f4c88417c8a82023ad139beed05075ac3f21b85b4ffc1fd8ad2ea0c4685d616