[INFO] fetching crate unit15 0.1.0...
[INFO] checking unit15-0.1.0 against try#86f78589b09557f70c9db3f56ad1921e0a9f76ef for pr-138438
[INFO] extracting crate unit15 0.1.0 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate unit15 0.1.0 on toolchain 86f78589b09557f70c9db3f56ad1921e0a9f76ef
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unit15 0.1.0
[INFO] finished tweaking crates.io crate unit15 0.1.0
[INFO] tweaked toml for crates.io crate unit15 0.1.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate crates.io crate unit15 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" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8b9c84ebb82f309b49efeb5f9c4a005f84e3e9ae80f6b0d4da0b871e4bb24762
[INFO] running `Command { std: "docker" "start" "-a" "8b9c84ebb82f309b49efeb5f9c4a005f84e3e9ae80f6b0d4da0b871e4bb24762", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b9c84ebb82f309b49efeb5f9c4a005f84e3e9ae80f6b0d4da0b871e4bb24762", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b9c84ebb82f309b49efeb5f9c4a005f84e3e9ae80f6b0d4da0b871e4bb24762", kill_on_drop: false }`
[INFO] [stdout] 8b9c84ebb82f309b49efeb5f9c4a005f84e3e9ae80f6b0d4da0b871e4bb24762
[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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+86f78589b09557f70c9db3f56ad1921e0a9f76ef" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c6bd5ce7eb65a7bc3e8dffa4e22829709c28dfacd5f666929116e4c5f1af40f
[INFO] running `Command { std: "docker" "start" "-a" "2c6bd5ce7eb65a7bc3e8dffa4e22829709c28dfacd5f666929116e4c5f1af40f", kill_on_drop: false }`
[INFO] [stderr]     Checking unit15 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/main.rs:220:9
[INFO] [stdout]     |
[INFO] [stdout] 220 |     let a = Cons(1, Rc::clone(&rc_list));// 调用Rc::clone(&rc_list)，此处变量rc_list的引用计数为1
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unit15` (bin "unit15"); 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to parse process output: `/opt/rustwide/rustup-home/toolchains/86f78589b09557f70c9db3f56ad1921e0a9f76ef/bin/rustc --crate-name unit15 --edition=2021 src/main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type bin --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=fbde6d7fc449116d -C extra-filename=-0264a64124ae979e --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints=forbid` (exit status: 0)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/main.rs:220:9
[INFO] [stdout]     |
[INFO] [stdout] 220 |     let a = Cons(1, Rc::clone(&rc_list));// 调用Rc::clone(&rc_list)，此处变量rc_list的引用计数为1
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unit15` (bin "unit15" test); 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to parse process output: `/opt/rustwide/rustup-home/toolchains/86f78589b09557f70c9db3f56ad1921e0a9f76ef/bin/rustc --crate-name unit15 --edition=2021 src/main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --test --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=73ce80a9db8dc204 -C extra-filename=-185f111e11592a3f --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints=forbid` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "2c6bd5ce7eb65a7bc3e8dffa4e22829709c28dfacd5f666929116e4c5f1af40f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c6bd5ce7eb65a7bc3e8dffa4e22829709c28dfacd5f666929116e4c5f1af40f", kill_on_drop: false }`
[INFO] [stdout] 2c6bd5ce7eb65a7bc3e8dffa4e22829709c28dfacd5f666929116e4c5f1af40f