[INFO] updating cached repository https://github.com/EvilRobotOverlord/mnist-dataset-rust
[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] d7b48065345e32b3a432e72cc77512b86f513d3c
[INFO] checking EvilRobotOverlord/mnist-dataset-rust against master#1557fb031b272b4c5bfcc7de5df7eddc7b36a584 for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEvilRobotOverlord%2Fmnist-dataset-rust" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EvilRobotOverlord/mnist-dataset-rust on toolchain 1557fb031b272b4c5bfcc7de5df7eddc7b36a584
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/EvilRobotOverlord/mnist-dataset-rust
[INFO] finished tweaking git repo https://github.com/EvilRobotOverlord/mnist-dataset-rust
[INFO] tweaked toml for git repo https://github.com/EvilRobotOverlord/mnist-dataset-rust written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/EvilRobotOverlord/mnist-dataset-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b5b76778ad943c9e8052889d0384129a451d2cfbfd25ef62ba0d2d96d6ac1b91
[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" "b5b76778ad943c9e8052889d0384129a451d2cfbfd25ef62ba0d2d96d6ac1b91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5b76778ad943c9e8052889d0384129a451d2cfbfd25ef62ba0d2d96d6ac1b91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5b76778ad943c9e8052889d0384129a451d2cfbfd25ef62ba0d2d96d6ac1b91", kill_on_drop: false }`
[INFO] [stdout] b5b76778ad943c9e8052889d0384129a451d2cfbfd25ef62ba0d2d96d6ac1b91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e073f4530aaec2537e6a11a2c48040b8a0196995246ac56eb26cd206d1d33e2d
[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" "e073f4530aaec2537e6a11a2c48040b8a0196995246ac56eb26cd206d1d33e2d", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.41
[INFO] [stderr]    Compiling num-traits v0.2.5
[INFO] [stderr]    Compiling cc v1.0.17
[INFO] [stderr]    Compiling serde v1.0.67
[INFO] [stderr]    Compiling matrixmultiply v0.1.14
[INFO] [stderr]     Checking rawpointer v0.1.0
[INFO] [stderr]     Checking cfg-if v0.1.3
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]    Compiling ndarray v0.11.2
[INFO] [stderr]     Checking byteorder v1.2.3
[INFO] [stderr]     Checking itertools v0.7.8
[INFO] [stderr]     Checking xattr v0.2.1
[INFO] [stderr]     Checking filetime v0.2.1
[INFO] [stderr]     Checking tar v0.4.15
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking flate2 v1.0.1
[INFO] [stderr]     Checking bincode v1.0.1
[INFO] [stderr]     Checking mnist-dataset-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/exec.rs:6:44
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn exec(one_d: bool) -> Result<(), Box<Error>> {
[INFO] [stdout]   |                                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/read.rs:26:57
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn images(set: &str, one_d: bool) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                                         ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/read.rs:72:44
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn labels(set: &str) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/exec.rs:6:44
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn exec(one_d: bool) -> Result<(), Box<Error>> {
[INFO] [stdout]   |                                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/read.rs:26:57
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn images(set: &str, one_d: bool) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                                         ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/read.rs:72:44
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn labels(set: &str) -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:22:41
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn it_loads_run() -> Result<(), Box<Error>> {
[INFO] [stdout]    |                                         ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 21.54s
[INFO] running `Command { std: "docker" "inspect" "e073f4530aaec2537e6a11a2c48040b8a0196995246ac56eb26cd206d1d33e2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e073f4530aaec2537e6a11a2c48040b8a0196995246ac56eb26cd206d1d33e2d", kill_on_drop: false }`
[INFO] [stdout] e073f4530aaec2537e6a11a2c48040b8a0196995246ac56eb26cd206d1d33e2d