[INFO] updating cached repository https://github.com/SkyZH/mnist.rs
[INFO] running `"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"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 70b95e47ea15cbbfe2d7ba45bde0fc64a17971fa
[INFO] checking SkyZH/mnist.rs against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSkyZH%2Fmnist.rs" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/SkyZH/mnist.rs on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/SkyZH/mnist.rs
[INFO] finished tweaking git repo https://github.com/SkyZH/mnist.rs
[INFO] tweaked toml for git repo https://github.com/SkyZH/mnist.rs written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/SkyZH/mnist.rs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "/opt/rustwide/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] a4497b7af7fba92625a616ee47ae1957011be85fc66072257087cefb2bfb7fab
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "a4497b7af7fba92625a616ee47ae1957011be85fc66072257087cefb2bfb7fab"`
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]     Checking spin v0.5.0
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]     Checking mnist v0.4.0
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking getrandom v0.1.6
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking rulinalg v0.4.2
[INFO] [stderr]     Checking mnist-deep-learning v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/network/network.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 |     pub layers: Vec<Box<Layer + Sync>>
[INFO] [stderr]   |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn Layer + Sync`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/network/network.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 |     pub layers: Vec<Box<Layer + Sync>>
[INFO] [stderr]   |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn Layer + Sync`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/network/network.rs:24:32
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn new(layers: Vec<Box<Layer + Sync>>) -> Self {
[INFO] [stderr]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn Layer + Sync`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/network/network.rs:24:32
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn new(layers: Vec<Box<Layer + Sync>>) -> Self {
[INFO] [stderr]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn Layer + Sync`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BaseMatrix`, `Matrix`
[INFO] [stderr]  --> src/main.rs:6:14
[INFO] [stderr]   |
[INFO] [stderr] 6 |     matrix::{BaseMatrix, Matrix},
[INFO] [stderr]   |              ^^^^^^^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/network/network.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 |     pub layers: Vec<Box<Layer + Sync>>
[INFO] [stderr]   |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn Layer + Sync`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/network/network.rs:24:32
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn new(layers: Vec<Box<Layer + Sync>>) -> Self {
[INFO] [stderr]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn Layer + Sync`
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BaseMatrix`, `Matrix`
[INFO] [stderr]  --> src/main.rs:6:14
[INFO] [stderr]   |
[INFO] [stderr] 6 |     matrix::{BaseMatrix, Matrix},
[INFO] [stderr]   |              ^^^^^^^^^^  ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/network/network.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 |     pub layers: Vec<Box<Layer + Sync>>
[INFO] [stderr]   |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn Layer + Sync`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/network/network.rs:24:32
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn new(layers: Vec<Box<Layer + Sync>>) -> Self {
[INFO] [stderr]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn Layer + Sync`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new_test`
[INFO] [stderr]   --> src/network/network.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     pub fn new_test() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `data`
[INFO] [stderr]  --> src/dataset.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     data: Mnist,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `data`
[INFO] [stderr]  --> src/dataset.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     data: Mnist,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.51s
[INFO] running `"docker" "inspect" "a4497b7af7fba92625a616ee47ae1957011be85fc66072257087cefb2bfb7fab"`
[INFO] running `"docker" "rm" "-f" "a4497b7af7fba92625a616ee47ae1957011be85fc66072257087cefb2bfb7fab"`
[INFO] [stdout] a4497b7af7fba92625a616ee47ae1957011be85fc66072257087cefb2bfb7fab