[INFO] fetching crate head_tail 0.1.0...
[INFO] checking head_tail-0.1.0 against master#e9182f195b8505c87c4bd055b9f6e114ccda0981 for pr-144098
[INFO] extracting crate head_tail 0.1.0 into /workspace/builds/worker-3-tc1/source
[INFO] removed /workspace/builds/worker-3-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate head_tail 0.1.0
[INFO] finished tweaking crates.io crate head_tail 0.1.0
[INFO] tweaked toml for crates.io crate head_tail 0.1.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate head_tail 0.1.0 on toolchain e9182f195b8505c87c4bd055b9f6e114ccda0981
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e9182f195b8505c87c4bd055b9f6e114ccda0981" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate head_tail 0.1.0 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" "+e9182f195b8505c87c4bd055b9f6e114ccda0981" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+e9182f195b8505c87c4bd055b9f6e114ccda0981" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f2e8ce96f6674c74dcb0ec2ba949b94e7dcf6f55de66e589f5065f121c1b623b
[INFO] running `Command { std: "docker" "start" "-a" "f2e8ce96f6674c74dcb0ec2ba949b94e7dcf6f55de66e589f5065f121c1b623b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f2e8ce96f6674c74dcb0ec2ba949b94e7dcf6f55de66e589f5065f121c1b623b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2e8ce96f6674c74dcb0ec2ba949b94e7dcf6f55de66e589f5065f121c1b623b", kill_on_drop: false }`
[INFO] [stdout] f2e8ce96f6674c74dcb0ec2ba949b94e7dcf6f55de66e589f5065f121c1b623b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+e9182f195b8505c87c4bd055b9f6e114ccda0981" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d23f9157c7dbc5322c06e6c8567a7867ef06a809d28f4ea47abdd8234ef4893e
[INFO] running `Command { std: "docker" "start" "-a" "d23f9157c7dbc5322c06e6c8567a7867ef06a809d28f4ea47abdd8234ef4893e", kill_on_drop: false }`
[INFO] [stderr]     Checking head_tail v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/head_tail.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 |     for (i, line) in reader.lines().enumerate().take(n) {
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/head_tail.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 |     for (i, line) in reader.lines().enumerate().take(n) {
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: failed to write `/opt/rustwide/target/debug/.fingerprint/head_tail-b05093041a385f2d/test-lib-head_tail`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: failed to write `/opt/rustwide/target/debug/.fingerprint/head_tail-eee78d83deaecaff/lib-head_tail`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] running `Command { std: "docker" "inspect" "d23f9157c7dbc5322c06e6c8567a7867ef06a809d28f4ea47abdd8234ef4893e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d23f9157c7dbc5322c06e6c8567a7867ef06a809d28f4ea47abdd8234ef4893e", kill_on_drop: false }`
[INFO] [stdout] d23f9157c7dbc5322c06e6c8567a7867ef06a809d28f4ea47abdd8234ef4893e