[INFO] fetching crate lightfield_loader 0.3.0...
[INFO] building lightfield_loader-0.3.0 against master#881c1ac408d93bb7adaa3a51dabab9266e82eee8 for issue-85264
[INFO] extracting crate lightfield_loader 0.3.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate lightfield_loader 0.3.0 on toolchain 881c1ac408d93bb7adaa3a51dabab9266e82eee8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lightfield_loader 0.3.0
[INFO] finished tweaking crates.io crate lightfield_loader 0.3.0
[INFO] tweaked toml for crates.io crate lightfield_loader 0.3.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded msdos_time v0.1.6
[INFO] [stderr]   Downloaded png v0.5.2
[INFO] [stderr]   Downloaded inflate v0.1.1
[INFO] [stderr]   Downloaded image v0.10.4
[INFO] [stderr]   Downloaded podio v0.1.7
[INFO] [stderr]   Downloaded zip v0.1.19
[INFO] [stderr]   Downloaded cgmath v0.9.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "metadata" "--no-deps" "--format-version=1", 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] f63f7cf4b0a6bb09a6ad89b78752ff2a0efb9f586cdd07cef89ea8b19f18be89
[INFO] running `Command { std: "docker" "start" "-a" "f63f7cf4b0a6bb09a6ad89b78752ff2a0efb9f586cdd07cef89ea8b19f18be89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f63f7cf4b0a6bb09a6ad89b78752ff2a0efb9f586cdd07cef89ea8b19f18be89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f63f7cf4b0a6bb09a6ad89b78752ff2a0efb9f586cdd07cef89ea8b19f18be89", kill_on_drop: false }`
[INFO] [stdout] f63f7cf4b0a6bb09a6ad89b78752ff2a0efb9f586cdd07cef89ea8b19f18be89
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fbe83872443131e50715cc92aa9b90f15e424c1911cb58380a3b579a7b63b2c9
[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" "fbe83872443131e50715cc92aa9b90f15e424c1911cb58380a3b579a7b63b2c9", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.68
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling color_quant v1.1.0
[INFO] [stderr]    Compiling inflate v0.1.1
[INFO] [stderr]    Compiling lzw v0.10.0
[INFO] [stderr]    Compiling byteorder v0.5.3
[INFO] [stderr]    Compiling glob v0.2.11
[INFO] [stderr]    Compiling scoped_threadpool v0.1.9
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.4
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling gif v0.9.2
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling msdos_time v0.1.6
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling bzip2-sys v0.1.10+1.0.8
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling flate2 v0.2.20
[INFO] [stderr]    Compiling bzip2 v0.3.3
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling png v0.5.2
[INFO] [stderr]    Compiling zip v0.1.19
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling jpeg-decoder v0.1.22
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling cgmath v0.9.1
[INFO] [stderr]    Compiling image v0.10.4
[INFO] [stderr]    Compiling lightfield_loader v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:70:23
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let zipfile = try!(File::open(zip_filename));
[INFO] [stdout]    |                       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:71:27
[INFO] [stdout]    |
[INFO] [stdout] 71 |         let mut archive = try!(zip::ZipArchive::new(zipfile));
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:75:33
[INFO] [stdout]    |
[INFO] [stdout] 75 |             let mut file = &mut try!(archive.by_index(i));
[INFO] [stdout]    |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:82:27
[INFO] [stdout]    |
[INFO] [stdout] 82 |             let iy: i32 = try!(parts[1].parse());
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:83:27
[INFO] [stdout]    |
[INFO] [stdout] 83 |             let ix: i32 = try!(parts[2].parse());
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:84:26
[INFO] [stdout]    |
[INFO] [stdout] 84 |             let y: f32 = try!(parts[3].parse());
[INFO] [stdout]    |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:85:26
[INFO] [stdout]    |
[INFO] [stdout] 85 |             let x: f32 = try!(parts[4].parse());
[INFO] [stdout]    |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |             try!(file.read_to_end(&mut contents));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:89:25
[INFO] [stdout]    |
[INFO] [stdout] 89 |             let image = try!(image::load_from_memory(&contents));
[INFO] [stdout]    |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lightfield.rs:75:17
[INFO] [stdout]    |
[INFO] [stdout] 75 |             let mut file = &mut try!(archive.by_index(i));
[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: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 52.87s
[INFO] running `Command { std: "docker" "inspect" "fbe83872443131e50715cc92aa9b90f15e424c1911cb58380a3b579a7b63b2c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbe83872443131e50715cc92aa9b90f15e424c1911cb58380a3b579a7b63b2c9", kill_on_drop: false }`
[INFO] [stdout] fbe83872443131e50715cc92aa9b90f15e424c1911cb58380a3b579a7b63b2c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6f1f2fe899ede95a1364ffe5b76b3a68ac3c6511d47bd1d4721bd09d87b74bd7
[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" "6f1f2fe899ede95a1364ffe5b76b3a68ac3c6511d47bd1d4721bd09d87b74bd7", kill_on_drop: false }`
[INFO] [stderr]    Compiling lightfield_loader v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:70:23
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let zipfile = try!(File::open(zip_filename));
[INFO] [stdout]    |                       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:71:27
[INFO] [stdout]    |
[INFO] [stdout] 71 |         let mut archive = try!(zip::ZipArchive::new(zipfile));
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:75:33
[INFO] [stdout]    |
[INFO] [stdout] 75 |             let mut file = &mut try!(archive.by_index(i));
[INFO] [stdout]    |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:82:27
[INFO] [stdout]    |
[INFO] [stdout] 82 |             let iy: i32 = try!(parts[1].parse());
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:83:27
[INFO] [stdout]    |
[INFO] [stdout] 83 |             let ix: i32 = try!(parts[2].parse());
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:84:26
[INFO] [stdout]    |
[INFO] [stdout] 84 |             let y: f32 = try!(parts[3].parse());
[INFO] [stdout]    |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:85:26
[INFO] [stdout]    |
[INFO] [stdout] 85 |             let x: f32 = try!(parts[4].parse());
[INFO] [stdout]    |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |             try!(file.read_to_end(&mut contents));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:89:25
[INFO] [stdout]    |
[INFO] [stdout] 89 |             let image = try!(image::load_from_memory(&contents));
[INFO] [stdout]    |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lightfield.rs:75:17
[INFO] [stdout]    |
[INFO] [stdout] 75 |             let mut file = &mut try!(archive.by_index(i));
[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: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:70:23
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let zipfile = try!(File::open(zip_filename));
[INFO] [stdout]    |                       ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:71:27
[INFO] [stdout]    |
[INFO] [stdout] 71 |         let mut archive = try!(zip::ZipArchive::new(zipfile));
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:75:33
[INFO] [stdout]    |
[INFO] [stdout] 75 |             let mut file = &mut try!(archive.by_index(i));
[INFO] [stdout]    |                                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:82:27
[INFO] [stdout]    |
[INFO] [stdout] 82 |             let iy: i32 = try!(parts[1].parse());
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:83:27
[INFO] [stdout]    |
[INFO] [stdout] 83 |             let ix: i32 = try!(parts[2].parse());
[INFO] [stdout]    |                           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:84:26
[INFO] [stdout]    |
[INFO] [stdout] 84 |             let y: f32 = try!(parts[3].parse());
[INFO] [stdout]    |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:85:26
[INFO] [stdout]    |
[INFO] [stdout] 85 |             let x: f32 = try!(parts[4].parse());
[INFO] [stdout]    |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:87:13
[INFO] [stdout]    |
[INFO] [stdout] 87 |             try!(file.read_to_end(&mut contents));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lightfield.rs:89:25
[INFO] [stdout]    |
[INFO] [stdout] 89 |             let image = try!(image::load_from_memory(&contents));
[INFO] [stdout]    |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lightfield.rs:75:17
[INFO] [stdout]    |
[INFO] [stdout] 75 |             let mut file = &mut try!(archive.by_index(i));
[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: panic message is not a string literal
[INFO] [stdout]   --> tests/lib.rs:30:27
[INFO] [stdout]    |
[INFO] [stdout] 30 |         Err(e) => {panic!(format!("{:?}", e))},
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout]    = note: the panic!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 30 |         Err(e) => {panic!("{:?}", e)},
[INFO] [stdout]    |                          --       --
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/lib.rs:31:22
[INFO] [stdout]    |
[INFO] [stdout] 31 |         _ => {panic!(format!("failed to fail"))},
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout]    = note: the panic!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 31 |         _ => {panic!("failed to fail")},
[INFO] [stdout]    |                     --              --
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.73s
[INFO] running `Command { std: "docker" "inspect" "6f1f2fe899ede95a1364ffe5b76b3a68ac3c6511d47bd1d4721bd09d87b74bd7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f1f2fe899ede95a1364ffe5b76b3a68ac3c6511d47bd1d4721bd09d87b74bd7", kill_on_drop: false }`
[INFO] [stdout] 6f1f2fe899ede95a1364ffe5b76b3a68ac3c6511d47bd1d4721bd09d87b74bd7
