[INFO] fetching crate skip-linked-list 0.1.0...
[INFO] testing skip-linked-list-0.1.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate skip-linked-list 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate skip-linked-list 0.1.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate skip-linked-list 0.1.0
[INFO] finished tweaking crates.io crate skip-linked-list 0.1.0
[INFO] tweaked toml for crates.io crate skip-linked-list 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate skip-linked-list 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] beb6456ace7c4c56078d5712104e34649bc6e053d797057da585b4499689051d
[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" "beb6456ace7c4c56078d5712104e34649bc6e053d797057da585b4499689051d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "beb6456ace7c4c56078d5712104e34649bc6e053d797057da585b4499689051d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "beb6456ace7c4c56078d5712104e34649bc6e053d797057da585b4499689051d", kill_on_drop: false }`
[INFO] [stdout] beb6456ace7c4c56078d5712104e34649bc6e053d797057da585b4499689051d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5815e15bba16b5b8c99df27161c03096b24a2cd04fcba9a2473bc503c5b034dc
[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" "5815e15bba16b5b8c99df27161c03096b24a2cd04fcba9a2473bc503c5b034dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling skip-linked-list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `pop_back`
[INFO] [stdout]    --> src/list.rs:161:12
[INFO] [stdout]     |
[INFO] [stdout] 161 |     pub fn pop_back(&mut self) -> T {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]    --> src/list.rs:170:12
[INFO] [stdout]     |
[INFO] [stdout] 170 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter_mut`
[INFO] [stdout]    --> src/list.rs:179:12
[INFO] [stdout]     |
[INFO] [stdout] 179 |     pub fn iter_mut(&mut self) -> IterMut<T> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_iter`
[INFO] [stdout]    --> src/list.rs:188:12
[INFO] [stdout]     |
[INFO] [stdout] 188 |     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.37s
[INFO] running `Command { std: "docker" "inspect" "5815e15bba16b5b8c99df27161c03096b24a2cd04fcba9a2473bc503c5b034dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5815e15bba16b5b8c99df27161c03096b24a2cd04fcba9a2473bc503c5b034dc", kill_on_drop: false }`
[INFO] [stdout] 5815e15bba16b5b8c99df27161c03096b24a2cd04fcba9a2473bc503c5b034dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", 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] ce4fef2f2358531115f87f3a6a17a79faca5ba5ad91f025a96f1f2896ece1ef9
[INFO] running `Command { std: "docker" "start" "-a" "ce4fef2f2358531115f87f3a6a17a79faca5ba5ad91f025a96f1f2896ece1ef9", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.55
[INFO] [stderr]    Compiling serde_json v1.0.60
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling tinytemplate v1.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling criterion v0.3.3
[INFO] [stderr]    Compiling skip-linked-list v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 51.55s
[INFO] running `Command { std: "docker" "inspect" "ce4fef2f2358531115f87f3a6a17a79faca5ba5ad91f025a96f1f2896ece1ef9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce4fef2f2358531115f87f3a6a17a79faca5ba5ad91f025a96f1f2896ece1ef9", kill_on_drop: false }`
[INFO] [stdout] ce4fef2f2358531115f87f3a6a17a79faca5ba5ad91f025a96f1f2896ece1ef9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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" "+1.49.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 88d6f5bb08b87e379e2eefb587fe46a0eadd6f7a20ed85761cf7d8062960b3d3
[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" "88d6f5bb08b87e379e2eefb587fe46a0eadd6f7a20ed85761cf7d8062960b3d3", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/skip_linked_list-ea52fd2ac889f2b7
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stdout] test list::test::into_iter ... ok
[INFO] [stdout] test list::test::iter ... ok
[INFO] [stdout] test list::test::iter_mut ... ok
[INFO] [stdout] test list::test::basics ... ok
[INFO] [stdout] test list::test::pops ... ok
[INFO] [stdout] test list::test::small_random ... ok
[INFO] [stdout] test list::test::panic_pop_front ... ok
[INFO] [stdout] test list::test::panic_pop_back ... ok
[INFO] [stdout] test list::test::panic_insert ... ok
[INFO] [stdout] test list::test::drop ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/skip_linked_list-ec545250f81ddafa
[INFO] [stdout] test list::test::pops ... ok
[INFO] [stdout] test list::test::basics ... ok
[INFO] [stdout] test list::test::into_iter ... ok
[INFO] [stdout] test list::test::iter_mut ... ok
[INFO] [stdout] test list::test::iter ... ok
[INFO] [stdout] test list::test::small_random ... ok
[INFO] [stdout] test list::test::panic_insert ... ok
[INFO] [stdout] test list::test::panic_pop_back ... ok
[INFO] [stdout] test list::test::panic_pop_front ... ok
[INFO] [stdout] test list::test::drop ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests skip-linked-list
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/list.rs - list::SkipLinkedList<T>::get (line 93) ... ok
[INFO] [stdout] test src/list.rs - list::SkipLinkedList<T>::insert (line 56) ... ok
[INFO] [stdout] test src/list.rs - list::SkipLinkedList (line 14) ... ok
[INFO] [stdout] test src/list.rs - list::SkipLinkedList<T>::remove (line 110) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "88d6f5bb08b87e379e2eefb587fe46a0eadd6f7a20ed85761cf7d8062960b3d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88d6f5bb08b87e379e2eefb587fe46a0eadd6f7a20ed85761cf7d8062960b3d3", kill_on_drop: false }`
[INFO] [stdout] 88d6f5bb08b87e379e2eefb587fe46a0eadd6f7a20ed85761cf7d8062960b3d3