[INFO] cloning repository https://github.com/btrust-builders/rust-week-1-exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/btrust-builders/rust-week-1-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbtrust-builders%2Frust-week-1-exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbtrust-builders%2Frust-week-1-exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] be0ad8b47852625fbe559131c39fb9e5649ddd95
[INFO] checking btrust-builders/rust-week-1-exercises against try#9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840 for pr-149518
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbtrust-builders%2Frust-week-1-exercises" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/btrust-builders/rust-week-1-exercises
[INFO] finished tweaking git repo https://github.com/btrust-builders/rust-week-1-exercises
[INFO] tweaked toml for git repo https://github.com/btrust-builders/rust-week-1-exercises written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/btrust-builders/rust-week-1-exercises on toolchain 9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/btrust-builders/rust-week-1-exercises 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" "+9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking btrust-builders/rust-week-1-exercises against try#9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840 for pr-149518
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbtrust-builders%2Frust-week-1-exercises" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/btrust-builders/rust-week-1-exercises
[INFO] finished tweaking git repo https://github.com/btrust-builders/rust-week-1-exercises
[INFO] tweaked toml for git repo https://github.com/btrust-builders/rust-week-1-exercises written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/btrust-builders/rust-week-1-exercises on toolchain 9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/btrust-builders/rust-week-1-exercises 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" "+9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840" "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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3986f8da4d8a5378dc3d42488439a6e165930aaac6d73e077660ee1e4f2452b2
[INFO] running `Command { std: "docker" "start" "-a" "3986f8da4d8a5378dc3d42488439a6e165930aaac6d73e077660ee1e4f2452b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3986f8da4d8a5378dc3d42488439a6e165930aaac6d73e077660ee1e4f2452b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3986f8da4d8a5378dc3d42488439a6e165930aaac6d73e077660ee1e4f2452b2", kill_on_drop: false }`
[INFO] [stdout] 3986f8da4d8a5378dc3d42488439a6e165930aaac6d73e077660ee1e4f2452b2
[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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+9b8307bcb9d1de8ffc7e1c81c48efffdb24ee840" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6a8dff74b49c7ec49a61763ec5b66b4e6e3f0ba5096b276a087941d2ad5783b
[INFO] running `Command { std: "docker" "start" "-a" "c6a8dff74b49c7ec49a61763ec5b66b4e6e3f0ba5096b276a087941d2ad5783b", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-week-1-exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `raw_tx_hex`
[INFO] [stdout]  --> src/lib.rs:2:27
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn extract_tx_version(raw_tx_hex: &str) -> Result<u32, String> {
[INFO] [stdout]   |                           ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_raw_tx_hex`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `raw_tx_hex`
[INFO] [stdout]  --> src/lib.rs:2:27
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn extract_tx_version(raw_tx_hex: &str) -> Result<u32, String> {
[INFO] [stdout]   |                           ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_raw_tx_hex`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "c6a8dff74b49c7ec49a61763ec5b66b4e6e3f0ba5096b276a087941d2ad5783b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6a8dff74b49c7ec49a61763ec5b66b4e6e3f0ba5096b276a087941d2ad5783b", kill_on_drop: false }`
[INFO] [stdout] c6a8dff74b49c7ec49a61763ec5b66b4e6e3f0ba5096b276a087941d2ad5783b