[INFO] cloning repository https://github.com/ra2dd/rust-concepts
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ra2dd/rust-concepts" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fra2dd%2Frust-concepts", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fra2dd%2Frust-concepts'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 18435a5d76a61298168e4bd620795d32d786731f
[INFO] checking ra2dd/rust-concepts against master#d3dd34a1d4a7e25a92a0d65994bb01a5d17c59ee for pr-127481-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fra2dd%2Frust-concepts" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ra2dd/rust-concepts on toolchain d3dd34a1d4a7e25a92a0d65994bb01a5d17c59ee
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d3dd34a1d4a7e25a92a0d65994bb01a5d17c59ee" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ra2dd/rust-concepts
[INFO] finished tweaking git repo https://github.com/ra2dd/rust-concepts
[INFO] tweaked toml for git repo https://github.com/ra2dd/rust-concepts written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ra2dd/rust-concepts 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" "+d3dd34a1d4a7e25a92a0d65994bb01a5d17c59ee" "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 ra2dd/rust-concepts against try#3d1ad905b56a11961be37df7dc5e56be58204dd8 for pr-127481-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fra2dd%2Frust-concepts" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ra2dd/rust-concepts on toolchain 3d1ad905b56a11961be37df7dc5e56be58204dd8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3d1ad905b56a11961be37df7dc5e56be58204dd8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ra2dd/rust-concepts
[INFO] finished tweaking git repo https://github.com/ra2dd/rust-concepts
[INFO] tweaked toml for git repo https://github.com/ra2dd/rust-concepts written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/ra2dd/rust-concepts 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" "+3d1ad905b56a11961be37df7dc5e56be58204dd8" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+3d1ad905b56a11961be37df7dc5e56be58204dd8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 46aedaf267ae4923f7dd86fbc84ed635f3b2933dacf782f5e6da1d11b51415de
[INFO] running `Command { std: "docker" "start" "-a" "46aedaf267ae4923f7dd86fbc84ed635f3b2933dacf782f5e6da1d11b51415de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46aedaf267ae4923f7dd86fbc84ed635f3b2933dacf782f5e6da1d11b51415de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46aedaf267ae4923f7dd86fbc84ed635f3b2933dacf782f5e6da1d11b51415de", kill_on_drop: false }`
[INFO] [stdout] 46aedaf267ae4923f7dd86fbc84ed635f3b2933dacf782f5e6da1d11b51415de
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+3d1ad905b56a11961be37df7dc5e56be58204dd8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1231a38cf0ef46549c507857e613a11f38042a3dbda551c09b41d8e530bc4aaf
[INFO] running `Command { std: "docker" "start" "-a" "1231a38cf0ef46549c507857e613a11f38042a3dbda551c09b41d8e530bc4aaf", kill_on_drop: false }`
[INFO] [stderr]     Checking concepts v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/main.rs:63:10
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let (x, y, z) = tup;
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/main.rs:63:16
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let (x, y, z) = tup;
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/main.rs:63:10
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let (x, y, z) = tup;
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/main.rs:63:16
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let (x, y, z) = tup;
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `helper` is never read
[INFO] [stdout]    --> src/main.rs:265:32
[INFO] [stdout]     |
[INFO] [stdout] 265 |         let (mut a, mut b, mut helper) = (1, 1, 1);
[INFO] [stdout]     |                                ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]    --> src/main.rs:266:13
[INFO] [stdout]     |
[INFO] [stdout] 266 |         for index in 2..fib_index {
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `runtime_error` is never used
[INFO] [stdout]   --> src/main.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn runtime_error(array: [u8; 5]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `helper` is never read
[INFO] [stdout]    --> src/main.rs:265:32
[INFO] [stdout]     |
[INFO] [stdout] 265 |         let (mut a, mut b, mut helper) = (1, 1, 1);
[INFO] [stdout]     |                                ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]    --> src/main.rs:266:13
[INFO] [stdout]     |
[INFO] [stdout] 266 |         for index in 2..fib_index {
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `runtime_error` is never used
[INFO] [stdout]   --> src/main.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn runtime_error(array: [u8; 5]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "1231a38cf0ef46549c507857e613a11f38042a3dbda551c09b41d8e530bc4aaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1231a38cf0ef46549c507857e613a11f38042a3dbda551c09b41d8e530bc4aaf", kill_on_drop: false }`
[INFO] [stdout] 1231a38cf0ef46549c507857e613a11f38042a3dbda551c09b41d8e530bc4aaf