[INFO] fetching crate testfile 0.0.2...
[INFO] checking testfile-0.0.2 against beta for pr-78714
[INFO] extracting crate testfile 0.0.2 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate testfile 0.0.2 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate testfile 0.0.2
[INFO] finished tweaking crates.io crate testfile 0.0.2
[INFO] tweaked toml for crates.io crate testfile 0.0.2 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 826b24b81ba73c8f1dba85054ef5351c97acd10141efb3150f8232b1770e8c5e
[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" "826b24b81ba73c8f1dba85054ef5351c97acd10141efb3150f8232b1770e8c5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "826b24b81ba73c8f1dba85054ef5351c97acd10141efb3150f8232b1770e8c5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "826b24b81ba73c8f1dba85054ef5351c97acd10141efb3150f8232b1770e8c5e", kill_on_drop: false }`
[INFO] [stdout] 826b24b81ba73c8f1dba85054ef5351c97acd10141efb3150f8232b1770e8c5e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "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] 1072b9553e4c394e9fe8c036af3ed43387939f73ac09e2ddb79e5ee67b2f1a38
[INFO] running `Command { std: "docker" "start" "-a" "1072b9553e4c394e9fe8c036af3ed43387939f73ac09e2ddb79e5ee67b2f1a38", kill_on_drop: false }`
[INFO] [stderr]    Compiling rstest v0.6.4
[INFO] [stderr]     Checking testfile v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/./lib_tests.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let mut f = std::fs::File::open(&tf.path);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/./lib_tests.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let mut f = std::fs::File::open(&tf.path);
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.90s
[INFO] running `Command { std: "docker" "inspect" "1072b9553e4c394e9fe8c036af3ed43387939f73ac09e2ddb79e5ee67b2f1a38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1072b9553e4c394e9fe8c036af3ed43387939f73ac09e2ddb79e5ee67b2f1a38", kill_on_drop: false }`
[INFO] [stdout] 1072b9553e4c394e9fe8c036af3ed43387939f73ac09e2ddb79e5ee67b2f1a38