[INFO] fetching crate prec 1.1.0...
[INFO] checking prec-1.1.0 against master#40daf23eeb711dadf140b2536e67e3ff4c999196 for pr-142287
[INFO] extracting crate prec 1.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate prec 1.1.0 on toolchain 40daf23eeb711dadf140b2536e67e3ff4c999196
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+40daf23eeb711dadf140b2536e67e3ff4c999196" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-4-tc1/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: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+40daf23eeb711dadf140b2536e67e3ff4c999196" "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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+40daf23eeb711dadf140b2536e67e3ff4c999196" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5ee6d5e719b79d8c52f3bfe400111c3e8f35d60d82addfcd24d512751ba71805
[INFO] running `Command { std: "docker" "start" "-a" "5ee6d5e719b79d8c52f3bfe400111c3e8f35d60d82addfcd24d512751ba71805", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5ee6d5e719b79d8c52f3bfe400111c3e8f35d60d82addfcd24d512751ba71805", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ee6d5e719b79d8c52f3bfe400111c3e8f35d60d82addfcd24d512751ba71805", kill_on_drop: false }`
[INFO] [stdout] 5ee6d5e719b79d8c52f3bfe400111c3e8f35d60d82addfcd24d512751ba71805
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+40daf23eeb711dadf140b2536e67e3ff4c999196" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 155e21acdfa4c95e741223ed0c77836890c4489cd8f223c758bc45fae0a4c5e0
[INFO] running `Command { std: "docker" "start" "-a" "155e21acdfa4c95e741223ed0c77836890c4489cd8f223c758bc45fae0a4c5e0", 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 `Paren` is never constructed
[INFO] [stdout]    --> src/lib.rs:336:3
[INFO] [stdout]     |
[INFO] [stdout] 335 |     pub enum MathToken {
[INFO] [stdout]     |              --------- variant in this enum
[INFO] [stdout] 336 |         Paren(Box<Expression<MathOperator, MathToken>>),
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `MathToken` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "155e21acdfa4c95e741223ed0c77836890c4489cd8f223c758bc45fae0a4c5e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "155e21acdfa4c95e741223ed0c77836890c4489cd8f223c758bc45fae0a4c5e0", kill_on_drop: false }`
[INFO] [stdout] 155e21acdfa4c95e741223ed0c77836890c4489cd8f223c758bc45fae0a4c5e0