[INFO] cloning repository https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kazchimo/purely-functional-data-stuructures.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7259f58fdcce9dc859d18d9a3f24d71bebea301a
[INFO] testing kazchimo/purely-functional-data-stuructures.rs against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] finished tweaking git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] tweaked toml for git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "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] a3e9455520d82a07439db053d576e29ceaab947de6c793f5575edb18ad85a7dd
[INFO] running `Command { std: "docker" "start" "-a" "a3e9455520d82a07439db053d576e29ceaab947de6c793f5575edb18ad85a7dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a3e9455520d82a07439db053d576e29ceaab947de6c793f5575edb18ad85a7dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3e9455520d82a07439db053d576e29ceaab947de6c793f5575edb18ad85a7dd", kill_on_drop: false }`
[INFO] [stdout] a3e9455520d82a07439db053d576e29ceaab947de6c793f5575edb18ad85a7dd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d64301c990443f824d246d321b76648ec27c21b69e6062e339f518274ae7371b
[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" "d64301c990443f824d246d321b76648ec27c21b69e6062e339f518274ae7371b", kill_on_drop: false }`
[INFO] [stderr]    Compiling purely-functional-data-structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]  --> src/list.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Nil,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/list.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[derive(PartialEq, Debug)]
[INFO] [stdout]   |                     ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]  --> src/list.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(&'a T, Box<&'a List<'a, T>>),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/list.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[derive(PartialEq, Debug)]
[INFO] [stdout]   |                     ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty`
[INFO] [stdout]   --> src/list.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn empty() -> List<'static, T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `one`
[INFO] [stdout]   --> src/list.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn one(a: &T) -> List<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cons`
[INFO] [stdout]   --> src/list.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn cons<'a>(x: &'a T, s: &'a List<T>) -> List<'a, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]   --> src/list.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head`
[INFO] [stdout]   --> src/list.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn head(&self) -> &T {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/list.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn tail(&self) -> &List<'_, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `Command { std: "docker" "inspect" "d64301c990443f824d246d321b76648ec27c21b69e6062e339f518274ae7371b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d64301c990443f824d246d321b76648ec27c21b69e6062e339f518274ae7371b", kill_on_drop: false }`
[INFO] [stdout] d64301c990443f824d246d321b76648ec27c21b69e6062e339f518274ae7371b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "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] 373cc1014100eacedf827f1a7c9b7b0a93a78204c9a72cafe24fe33123e8b5f7
[INFO] running `Command { std: "docker" "start" "-a" "373cc1014100eacedf827f1a7c9b7b0a93a78204c9a72cafe24fe33123e8b5f7", kill_on_drop: false }`
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]  --> src/list.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Nil,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/list.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[derive(PartialEq, Debug)]
[INFO] [stdout]   |                     ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling purely-functional-data-structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]  --> src/list.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(&'a T, Box<&'a List<'a, T>>),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]  --> src/list.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[derive(PartialEq, Debug)]
[INFO] [stdout]   |                     ^^^^^
[INFO] [stdout]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty`
[INFO] [stdout]   --> src/list.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn empty() -> List<'static, T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `one`
[INFO] [stdout]   --> src/list.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn one(a: &T) -> List<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cons`
[INFO] [stdout]   --> src/list.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn cons<'a>(x: &'a T, s: &'a List<T>) -> List<'a, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]   --> src/list.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head`
[INFO] [stdout]   --> src/list.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn head(&self) -> &T {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/list.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn tail(&self) -> &List<'_, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.05s
[INFO] running `Command { std: "docker" "inspect" "373cc1014100eacedf827f1a7c9b7b0a93a78204c9a72cafe24fe33123e8b5f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "373cc1014100eacedf827f1a7c9b7b0a93a78204c9a72cafe24fe33123e8b5f7", kill_on_drop: false }`
[INFO] [stdout] 373cc1014100eacedf827f1a7c9b7b0a93a78204c9a72cafe24fe33123e8b5f7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c2e47c6f33d22671196746542131cf14801b1561d87aea8b89971d2df2d26bc5
[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" "c2e47c6f33d22671196746542131cf14801b1561d87aea8b89971d2df2d26bc5", kill_on_drop: false }`
[INFO] [stderr] warning: variant is never constructed: `Nil`
[INFO] [stderr]  --> src/list.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     Nil,
[INFO] [stderr]   |     ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]  --> src/list.rs:3:21
[INFO] [stderr]   |
[INFO] [stderr] 3 | #[derive(PartialEq, Debug)]
[INFO] [stderr]   |                     ^^^^^
[INFO] [stderr]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cons`
[INFO] [stderr]  --> src/list.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     Cons(&'a T, Box<&'a List<'a, T>>),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]  --> src/list.rs:3:21
[INFO] [stderr]   |
[INFO] [stderr] 3 | #[derive(PartialEq, Debug)]
[INFO] [stderr]   |                     ^^^^^
[INFO] [stderr]   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `empty`
[INFO] [stderr]   --> src/list.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn empty() -> List<'static, T> {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `one`
[INFO] [stderr]   --> src/list.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn one(a: &T) -> List<T> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `cons`
[INFO] [stderr]   --> src/list.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn cons<'a>(x: &'a T, s: &'a List<T>) -> List<'a, T> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_empty`
[INFO] [stderr]   --> src/list.rs:22:8
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn is_empty(&self) -> bool {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `head`
[INFO] [stderr]   --> src/list.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 29 |     fn head(&self) -> &T {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `tail`
[INFO] [stderr]   --> src/list.rs:36:8
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fn tail(&self) -> &List<'_, T> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `purely-functional-data-structures` (lib) generated 8 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/purely_functional_data_structures-e780b480fdf00c64)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test list::tests::head ... ok
[INFO] [stdout] test list::tests::tail ... ok
[INFO] [stdout] test list::tests::cons ... ok
[INFO] [stdout] test list::tests::is_empty ... ok
[INFO] [stdout] test list::tests::fail_head - should panic ... ok
[INFO] [stderr]    Doc-tests purely-functional-data-structures
[INFO] [stdout] test list::tests::fail_tail - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.11s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "c2e47c6f33d22671196746542131cf14801b1561d87aea8b89971d2df2d26bc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2e47c6f33d22671196746542131cf14801b1561d87aea8b89971d2df2d26bc5", kill_on_drop: false }`
[INFO] [stdout] c2e47c6f33d22671196746542131cf14801b1561d87aea8b89971d2df2d26bc5