[INFO] cloning repository https://github.com/asteroidb612/printer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/asteroidb612/printer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fasteroidb612%2Fprinter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fasteroidb612%2Fprinter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 78c779cac882989f41dd5742ea951d3d75d16623
[INFO] building asteroidb612/printer against master#ff34b919075f35a1787659e9c448a34b06bab8de for issue-85264
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fasteroidb612%2Fprinter" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/asteroidb612/printer on toolchain ff34b919075f35a1787659e9c448a34b06bab8de
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-2/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/asteroidb612/printer
[INFO] finished tweaking git repo https://github.com/asteroidb612/printer
[INFO] tweaked toml for git repo https://github.com/asteroidb612/printer written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/asteroidb612/printer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a471e907d5cd698b7e2777ecc52e854517073c22b6cb31abbaf7a47a6a0d5908
[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" "a471e907d5cd698b7e2777ecc52e854517073c22b6cb31abbaf7a47a6a0d5908", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a471e907d5cd698b7e2777ecc52e854517073c22b6cb31abbaf7a47a6a0d5908", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a471e907d5cd698b7e2777ecc52e854517073c22b6cb31abbaf7a47a6a0d5908", kill_on_drop: false }`
[INFO] [stdout] a471e907d5cd698b7e2777ecc52e854517073c22b6cb31abbaf7a47a6a0d5908
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "build" "--frozen" "--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] d826c23bdc3a222f5f7793d8eb530f71232a1bce057d9bb356bcea40c8a6a7c4
[INFO] running `Command { std: "docker" "start" "-a" "d826c23bdc3a222f5f7793d8eb530f71232a1bce057d9bb356bcea40c8a6a7c4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling cfg-if v0.1.9
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling futures v0.1.28
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]    Compiling safemem v0.3.1
[INFO] [stderr]    Compiling pkg-config v0.3.15
[INFO] [stderr]    Compiling itoa v0.4.4
[INFO] [stderr]    Compiling serde v1.0.98
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling nodrop v0.1.13
[INFO] [stderr]    Compiling foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling scopeguard v1.0.0
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling openssl-probe v0.1.2
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling ppv-lite86 v0.2.5
[INFO] [stderr]    Compiling dtoa v0.4.4
[INFO] [stderr]    Compiling remove_dir_all v0.5.2
[INFO] [stderr]    Compiling try-lock v0.2.2
[INFO] [stderr]    Compiling indexmap v1.0.2
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling rustc-demangle v0.1.15
[INFO] [stderr]    Compiling adler32 v1.0.3
[INFO] [stderr]    Compiling encoding_rs v0.8.17
[INFO] [stderr]    Compiling ascii v0.8.7
[INFO] [stderr]    Compiling rle-decode-fast v1.0.1
[INFO] [stderr]    Compiling chunked_transfer v0.3.1
[INFO] [stderr]    Compiling nom v2.1.0
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling ring v0.13.5
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]    Compiling unicode-bidi v0.2.6
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.8
[INFO] [stderr]    Compiling owning_ref v0.4.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling foreign-types v0.3.2
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling unicase v2.4.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[INFO] [stderr]    Compiling openssl-sys v0.9.48
[INFO] [stderr]    Compiling tokio-sync v0.1.6
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling tokio-executor v0.1.8
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling lock_api v0.1.5
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling getrandom v0.1.8
[INFO] [stderr]    Compiling memchr v1.0.2
[INFO] [stderr]    Compiling serial-core v0.4.0
[INFO] [stderr]    Compiling ioctl-rs v0.1.6
[INFO] [stderr]    Compiling termios v0.2.2
[INFO] [stderr]    Compiling filetime v0.2.6
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling want v0.2.0
[INFO] [stderr]    Compiling tokio-current-thread v0.1.6
[INFO] [stderr]    Compiling tokio-timer v0.2.11
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling threadpool v1.7.1
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling buf_redux v0.6.3
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling rand_core v0.5.0
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling base64 v0.9.3
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling serial-unix v0.4.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling backtrace v0.3.34
[INFO] [stderr]    Compiling gzip-header v0.3.0
[INFO] [stderr]    Compiling libflate v0.1.26
[INFO] [stderr]    Compiling mime v0.2.6
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling hyper v0.12.33
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling twoway v0.1.8
[INFO] [stderr]    Compiling uuid v0.2.3
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling serde_json v0.9.10
[INFO] [stderr]    Compiling openssl v0.10.24
[INFO] [stderr]    Compiling serial v0.4.0
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling http v0.1.18
[INFO] [stderr]    Compiling tokio-buf v0.1.1
[INFO] [stderr]    Compiling string v0.2.1
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling serde_codegen_internals v0.14.2
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]    Compiling error-chain v0.10.0
[INFO] [stderr]    Compiling deflate v0.7.20
[INFO] [stderr]    Compiling mime v0.3.13
[INFO] [stderr]    Compiling mime_guess v2.0.1
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling url v0.5.10
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf v0.7.24
[INFO] [stderr]    Compiling hyper v0.10.16
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling serde_derive v0.9.15
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling chrono v0.4.7
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling serde_urlencoded v0.5.5
[INFO] [stderr]    Compiling webpki v0.18.1
[INFO] [stderr]    Compiling sct v0.4.0
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling parking_lot v0.7.1
[INFO] [stderr]    Compiling mime_guess v1.8.7
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling ct-logs v0.4.0
[INFO] [stderr]    Compiling rustls v0.14.0
[INFO] [stderr]    Compiling webpki-roots v0.15.0
[INFO] [stderr]    Compiling rustls v0.13.1
[INFO] [stderr]    Compiling gag v0.1.10
[INFO] [stderr]    Compiling http-body v0.1.0
[INFO] [stderr]    Compiling h2 v0.1.26
[INFO] [stderr]    Compiling tokio-reactor v0.1.9
[INFO] [stderr]    Compiling brotli2 v0.3.2
[INFO] [stderr]    Compiling tokio-threadpool v0.1.15
[INFO] [stderr]    Compiling tiny_http v0.6.2
[INFO] [stderr]    Compiling cron v0.6.0
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling job_scheduler v1.0.6
[INFO] [stderr]    Compiling hyper-native-tls v0.3.0
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling multipart v0.13.6
[INFO] [stderr]    Compiling hyper-rustls v0.6.2
[INFO] [stderr]    Compiling tokio-rustls v0.8.1
[INFO] [stderr]    Compiling serde_derive v1.0.98
[INFO] [stderr]    Compiling hyper-rustls v0.15.1
[INFO] [stderr]    Compiling hyper-tls v0.3.2
[INFO] [stderr]    Compiling reqwest v0.9.8
[INFO] [stderr]    Compiling yup-oauth2 v1.0.12
[INFO] [stderr]    Compiling rouille v2.2.0
[INFO] [stderr]    Compiling google-calendar3 v1.0.5+20170514
[INFO] [stderr]    Compiling google-gmail1 v1.0.5+20170510
[INFO] [stderr]    Compiling lumberjack v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated constant `std::sync::ONCE_INIT`: the `new` function is now preferred
[INFO] [stdout]   --> src/main.rs:66:1
[INFO] [stdout]    |
[INFO] [stdout] 66 | / lazy_static! {
[INFO] [stdout] 67 | |     // Reasons we're touching the model:
[INFO] [stdout] 68 | |     // - To update it with a Msg (handled by update)
[INFO] [stdout] 69 | |     // - To send a serialization of it (handled by view)
[INFO] [stdout] ...  |
[INFO] [stdout] 79 | |     };
[INFO] [stdout] 80 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated constant `std::sync::ONCE_INIT`: the `new` function is now preferred
[INFO] [stdout]   --> src/main.rs:66:1
[INFO] [stdout]    |
[INFO] [stdout] 66 | / lazy_static! {
[INFO] [stdout] 67 | |     // Reasons we're touching the model:
[INFO] [stdout] 68 | |     // - To update it with a Msg (handled by update)
[INFO] [stdout] 69 | |     // - To send a serialization of it (handled by view)
[INFO] [stdout] ...  |
[INFO] [stdout] 79 | |     };
[INFO] [stdout] 80 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |         Ok(mut file) => file,
[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: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 59s
[INFO] running `Command { std: "docker" "inspect" "d826c23bdc3a222f5f7793d8eb530f71232a1bce057d9bb356bcea40c8a6a7c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d826c23bdc3a222f5f7793d8eb530f71232a1bce057d9bb356bcea40c8a6a7c4", kill_on_drop: false }`
[INFO] [stdout] d826c23bdc3a222f5f7793d8eb530f71232a1bce057d9bb356bcea40c8a6a7c4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20c159e69b5ed5e2f18ab6aea0b3dd9ec9b8a1661a52a275fc9c7acce24341bd
[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" "20c159e69b5ed5e2f18ab6aea0b3dd9ec9b8a1661a52a275fc9c7acce24341bd", kill_on_drop: false }`
[INFO] [stderr]    Compiling lumberjack v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated constant `std::sync::ONCE_INIT`: the `new` function is now preferred
[INFO] [stdout]   --> src/main.rs:66:1
[INFO] [stdout]    |
[INFO] [stdout] 66 | / lazy_static! {
[INFO] [stdout] 67 | |     // Reasons we're touching the model:
[INFO] [stdout] 68 | |     // - To update it with a Msg (handled by update)
[INFO] [stdout] 69 | |     // - To send a serialization of it (handled by view)
[INFO] [stdout] ...  |
[INFO] [stdout] 79 | |     };
[INFO] [stdout] 80 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated constant `std::sync::ONCE_INIT`: the `new` function is now preferred
[INFO] [stdout]   --> src/main.rs:66:1
[INFO] [stdout]    |
[INFO] [stdout] 66 | / lazy_static! {
[INFO] [stdout] 67 | |     // Reasons we're touching the model:
[INFO] [stdout] 68 | |     // - To update it with a Msg (handled by update)
[INFO] [stdout] 69 | |     // - To send a serialization of it (handled by view)
[INFO] [stdout] ...  |
[INFO] [stdout] 79 | |     };
[INFO] [stdout] 80 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |         Ok(mut file) => file,
[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: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.14s
[INFO] running `Command { std: "docker" "inspect" "20c159e69b5ed5e2f18ab6aea0b3dd9ec9b8a1661a52a275fc9c7acce24341bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20c159e69b5ed5e2f18ab6aea0b3dd9ec9b8a1661a52a275fc9c7acce24341bd", kill_on_drop: false }`
[INFO] [stdout] 20c159e69b5ed5e2f18ab6aea0b3dd9ec9b8a1661a52a275fc9c7acce24341bd
