[INFO] fetching crate prec 1.1.0...
[INFO] checking prec-1.1.0 against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] extracting crate prec 1.1.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate prec 1.1.0 on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate prec 1.1.0
[INFO] finished tweaking crates.io crate prec 1.1.0
[INFO] tweaked toml for crates.io crate prec 1.1.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate prec 1.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4e0a049dae53b67137efbb86eba1c60ba2b18faa92dba13bf631f6d05aba13ea
[INFO] running `Command { std: "docker" "start" "-a" "4e0a049dae53b67137efbb86eba1c60ba2b18faa92dba13bf631f6d05aba13ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e0a049dae53b67137efbb86eba1c60ba2b18faa92dba13bf631f6d05aba13ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e0a049dae53b67137efbb86eba1c60ba2b18faa92dba13bf631f6d05aba13ea", kill_on_drop: false }`
[INFO] [stdout] 4e0a049dae53b67137efbb86eba1c60ba2b18faa92dba13bf631f6d05aba13ea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b627de60081fb20ef7c9d4d5958a600118a7ad3afcc9a72d6e4c8acc9d1cc73c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b627de60081fb20ef7c9d4d5958a600118a7ad3afcc9a72d6e4c8acc9d1cc73c", kill_on_drop: false }`
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking prec v1.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Paren`
[INFO] [stdout]    --> src/lib.rs:336:3
[INFO] [stdout]     |
[INFO] [stdout] 336 |         Paren(Box<Expression<MathOperator, MathToken>>),
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.85s
[INFO] running `Command { std: "docker" "inspect" "b627de60081fb20ef7c9d4d5958a600118a7ad3afcc9a72d6e4c8acc9d1cc73c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b627de60081fb20ef7c9d4d5958a600118a7ad3afcc9a72d6e4c8acc9d1cc73c", kill_on_drop: false }`
[INFO] [stdout] b627de60081fb20ef7c9d4d5958a600118a7ad3afcc9a72d6e4c8acc9d1cc73c