[INFO] cloning repository https://github.com/bobisme/rustrnn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bobisme/rustrnn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbobisme%2Frustrnn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbobisme%2Frustrnn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 25573dfa1c0223e4f9a2aa843b63132b139e904a
[INFO] checking bobisme/rustrnn against master#8f359beca4e58bc3ae795a666301a8f47023044c for pr-121557
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbobisme%2Frustrnn" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bobisme/rustrnn on toolchain 8f359beca4e58bc3ae795a666301a8f47023044c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f359beca4e58bc3ae795a666301a8f47023044c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bobisme/rustrnn
[INFO] finished tweaking git repo https://github.com/bobisme/rustrnn
[INFO] tweaked toml for git repo https://github.com/bobisme/rustrnn written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/bobisme/rustrnn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f359beca4e58bc3ae795a666301a8f47023044c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking bobisme/rustrnn against try#80d5fe37e16a0befb4128414cb6a11d544788c0a for pr-121557
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbobisme%2Frustrnn" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bobisme/rustrnn on toolchain 80d5fe37e16a0befb4128414cb6a11d544788c0a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bobisme/rustrnn
[INFO] finished tweaking git repo https://github.com/bobisme/rustrnn
[INFO] tweaked toml for git repo https://github.com/bobisme/rustrnn written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/bobisme/rustrnn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "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-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 98309edb574e22071d7b583636fc12a0598a92d076a9b7d8b5cb3bdc2cea48ce
[INFO] running `Command { std: "docker" "start" "-a" "98309edb574e22071d7b583636fc12a0598a92d076a9b7d8b5cb3bdc2cea48ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98309edb574e22071d7b583636fc12a0598a92d076a9b7d8b5cb3bdc2cea48ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98309edb574e22071d7b583636fc12a0598a92d076a9b7d8b5cb3bdc2cea48ce", kill_on_drop: false }`
[INFO] [stdout] 98309edb574e22071d7b583636fc12a0598a92d076a9b7d8b5cb3bdc2cea48ce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ff38421c28dd3da1bf6a96cbd327ac8fddec843021cde035dcb2b493587fa664
[INFO] running `Command { std: "docker" "start" "-a" "ff38421c28dd3da1bf6a96cbd327ac8fddec843021cde035dcb2b493587fa664", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.23
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking rustrnn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Layer` is never constructed
[INFO] [stdout]  --> src/layer.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Layer {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `size`, and `input_size` are never used
[INFO] [stdout]   --> src/layer.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl Layer {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 10 |     pub fn new(input_size: usize, size: usize) -> Layer {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 18 |     pub fn size(&self) -> usize {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn input_size(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]    --> src/matrix.rs:440:13
[INFO] [stdout]     |
[INFO] [stdout] 440 |             m1 + &m2;
[INFO] [stdout]     |             ^^^^^^^^ the arithmetic operation produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 440 |             let _ = m1 + &m2;
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]    --> src/matrix.rs:488:13
[INFO] [stdout]     |
[INFO] [stdout] 488 |             m1 - &m2;
[INFO] [stdout]     |             ^^^^^^^^ the arithmetic operation produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 488 |             let _ = m1 - &m2;
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.89s
[INFO] running `Command { std: "docker" "inspect" "ff38421c28dd3da1bf6a96cbd327ac8fddec843021cde035dcb2b493587fa664", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff38421c28dd3da1bf6a96cbd327ac8fddec843021cde035dcb2b493587fa664", kill_on_drop: false }`
[INFO] [stdout] ff38421c28dd3da1bf6a96cbd327ac8fddec843021cde035dcb2b493587fa664