[INFO] cloning repository https://github.com/elvisbrevi/rust-learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/elvisbrevi/rust-learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felvisbrevi%2Frust-learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felvisbrevi%2Frust-learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5c35e7ea453f46b59ca036413750812d96101093
[INFO] checking elvisbrevi/rust-learning against master#0ef0dd24510b52da980889546fcd15254dc56a23 for pr-126452
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felvisbrevi%2Frust-learning" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/elvisbrevi/rust-learning on toolchain 0ef0dd24510b52da980889546fcd15254dc56a23
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0ef0dd24510b52da980889546fcd15254dc56a23" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/elvisbrevi/rust-learning
[INFO] finished tweaking git repo https://github.com/elvisbrevi/rust-learning
[INFO] tweaked toml for git repo https://github.com/elvisbrevi/rust-learning written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/elvisbrevi/rust-learning 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" "+0ef0dd24510b52da980889546fcd15254dc56a23" "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 elvisbrevi/rust-learning against try#d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9 for pr-126452
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felvisbrevi%2Frust-learning" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/elvisbrevi/rust-learning on toolchain d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/elvisbrevi/rust-learning
[INFO] finished tweaking git repo https://github.com/elvisbrevi/rust-learning
[INFO] tweaked toml for git repo https://github.com/elvisbrevi/rust-learning written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/elvisbrevi/rust-learning 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" "+d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "+d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5d1e6a13634164968ccba9d1f59d096f9ffca433cd9a40b74ca5d801f1d5ec92
[INFO] running `Command { std: "docker" "start" "-a" "5d1e6a13634164968ccba9d1f59d096f9ffca433cd9a40b74ca5d801f1d5ec92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5d1e6a13634164968ccba9d1f59d096f9ffca433cd9a40b74ca5d801f1d5ec92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d1e6a13634164968ccba9d1f59d096f9ffca433cd9a40b74ca5d801f1d5ec92", kill_on_drop: false }`
[INFO] [stdout] 5d1e6a13634164968ccba9d1f59d096f9ffca433cd9a40b74ca5d801f1d5ec92
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "+d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4ebdbafff6612a6ccd2dca02d90401b9065261bac3afc9dd9c1841a6d29c2b99
[INFO] running `Command { std: "docker" "start" "-a" "4ebdbafff6612a6ccd2dca02d90401b9065261bac3afc9dd9c1841a6d29c2b99", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_course v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     x = 20;
[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: value assigned to `x` is never read
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     x = 20;
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] running `Command { std: "docker" "inspect" "4ebdbafff6612a6ccd2dca02d90401b9065261bac3afc9dd9c1841a6d29c2b99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ebdbafff6612a6ccd2dca02d90401b9065261bac3afc9dd9c1841a6d29c2b99", kill_on_drop: false }`
[INFO] [stdout] 4ebdbafff6612a6ccd2dca02d90401b9065261bac3afc9dd9c1841a6d29c2b99