[INFO] fetching crate chainlink 0.1.0...
[INFO] checking chainlink-0.1.0 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate chainlink 0.1.0 into /workspace/builds/worker-100/source
[INFO] validating manifest of crates.io crate chainlink 0.1.0 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate chainlink 0.1.0
[INFO] finished tweaking crates.io crate chainlink 0.1.0
[INFO] tweaked toml for crates.io crate chainlink 0.1.0 written to /workspace/builds/worker-100/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f1d2263dcccc09a38306c3b80cf54b7e7765a2428bf65b6b03c49cf8727fbefc
[INFO] running `Command { std: "docker" "start" "-a" "f1d2263dcccc09a38306c3b80cf54b7e7765a2428bf65b6b03c49cf8727fbefc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f1d2263dcccc09a38306c3b80cf54b7e7765a2428bf65b6b03c49cf8727fbefc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1d2263dcccc09a38306c3b80cf54b7e7765a2428bf65b6b03c49cf8727fbefc", kill_on_drop: false }`
[INFO] [stdout] f1d2263dcccc09a38306c3b80cf54b7e7765a2428bf65b6b03c49cf8727fbefc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1036354bedadf91776b4581d6714bb188c887d28fa79d15454921aa4db210af5
[INFO] running `Command { std: "docker" "start" "-a" "1036354bedadf91776b4581d6714bb188c887d28fa79d15454921aa4db210af5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking thunderdome v0.4.1
[INFO] [stderr]     Checking chainlink v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `list`
[INFO] [stdout]   --> src/iter_links.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     list: &'a mut LinkedList<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fwd_pos`
[INFO] [stdout]   --> src/iter_links.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fwd_pos: Option<Index>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `rev_pos`
[INFO] [stdout]   --> src/iter_links.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     rev_pos: Option<Index>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `list`
[INFO] [stdout]   --> src/iter_links.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     list: &'a mut LinkedList<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fwd_pos`
[INFO] [stdout]   --> src/iter_links.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fwd_pos: Option<Index>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `rev_pos`
[INFO] [stdout]   --> src/iter_links.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     rev_pos: Option<Index>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `Command { std: "docker" "inspect" "1036354bedadf91776b4581d6714bb188c887d28fa79d15454921aa4db210af5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1036354bedadf91776b4581d6714bb188c887d28fa79d15454921aa4db210af5", kill_on_drop: false }`
[INFO] [stdout] 1036354bedadf91776b4581d6714bb188c887d28fa79d15454921aa4db210af5