[INFO] updating cached repository https://github.com/skies-unbroken/matrix
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e820095a0ccc1eadc7ee5de7ff829b551fe18536
[INFO] checking skies-unbroken/matrix against master#4fb54ed484e2239a3e9eff3be17df00d2a162be3 for pr-73345
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fskies-unbroken%2Fmatrix" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/skies-unbroken/matrix on toolchain 4fb54ed484e2239a3e9eff3be17df00d2a162be3
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fb54ed484e2239a3e9eff3be17df00d2a162be3" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/skies-unbroken/matrix
[INFO] finished tweaking git repo https://github.com/skies-unbroken/matrix
[INFO] tweaked toml for git repo https://github.com/skies-unbroken/matrix written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/skies-unbroken/matrix already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fb54ed484e2239a3e9eff3be17df00d2a162be3" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:6c9ffe128752d56c8d75334ed354142a5229917ed99767f56566dd8e857ad726" "/opt/rustwide/cargo-home/bin/cargo" "+4fb54ed484e2239a3e9eff3be17df00d2a162be3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7a706d7389c5f61f111f7eb1e7e925de2122949e1c7fadd374d613e47f3ed006
[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" "7a706d7389c5f61f111f7eb1e7e925de2122949e1c7fadd374d613e47f3ed006", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a706d7389c5f61f111f7eb1e7e925de2122949e1c7fadd374d613e47f3ed006", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a706d7389c5f61f111f7eb1e7e925de2122949e1c7fadd374d613e47f3ed006", kill_on_drop: false }`
[INFO] [stdout] 7a706d7389c5f61f111f7eb1e7e925de2122949e1c7fadd374d613e47f3ed006
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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@sha256:6c9ffe128752d56c8d75334ed354142a5229917ed99767f56566dd8e857ad726" "/opt/rustwide/cargo-home/bin/cargo" "+4fb54ed484e2239a3e9eff3be17df00d2a162be3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b2420a388c3725ec5b0bc55103281c53fe8dcfc9721d5a81e27ffeefd4dc5c8d
[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" "b2420a388c3725ec5b0bc55103281c53fe8dcfc9721d5a81e27ffeefd4dc5c8d", kill_on_drop: false }`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking calc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/lib.rs:327:33
[INFO] [stdout]     |
[INFO] [stdout] 327 |         pub fn submatrix(&self, r1: usize, r2: usize) -> Matrix {
[INFO] [stdout]     |                                 ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> src/lib.rs:327:44
[INFO] [stdout]     |
[INFO] [stdout] 327 |         pub fn submatrix(&self, r1: usize, r2: usize) -> Matrix {
[INFO] [stdout]     |                                            ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/lib.rs:327:33
[INFO] [stdout]     |
[INFO] [stdout] 327 |         pub fn submatrix(&self, r1: usize, r2: usize) -> Matrix {
[INFO] [stdout]     |                                 ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> src/lib.rs:327:44
[INFO] [stdout]     |
[INFO] [stdout] 327 |         pub fn submatrix(&self, r1: usize, r2: usize) -> Matrix {
[INFO] [stdout]     |                                            ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "b2420a388c3725ec5b0bc55103281c53fe8dcfc9721d5a81e27ffeefd4dc5c8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2420a388c3725ec5b0bc55103281c53fe8dcfc9721d5a81e27ffeefd4dc5c8d", kill_on_drop: false }`
[INFO] [stdout] b2420a388c3725ec5b0bc55103281c53fe8dcfc9721d5a81e27ffeefd4dc5c8d