[INFO] cloning repository https://github.com/varzac/rust_collections
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/varzac/rust_collections" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarzac%2Frust_collections", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarzac%2Frust_collections'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] db1285199d9300d32cdd25281583753dc1de814d
[INFO] checking varzac/rust_collections against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarzac%2Frust_collections" "/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/varzac/rust_collections on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/varzac/rust_collections
[INFO] finished tweaking git repo https://github.com/varzac/rust_collections
[INFO] tweaked toml for git repo https://github.com/varzac/rust_collections written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/varzac/rust_collections already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: path `/workspace/builds/worker-3/source/src/linked_list.rs` was erroneously implicitly accepted for binary `linked_list`,
[INFO] [stderr] please set bin.path in Cargo.toml
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 17dbc895bb9d67045b5a7f60671f579c14d4cb3e221b8a097849eb61208ce00a
[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" "17dbc895bb9d67045b5a7f60671f579c14d4cb3e221b8a097849eb61208ce00a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "17dbc895bb9d67045b5a7f60671f579c14d4cb3e221b8a097849eb61208ce00a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17dbc895bb9d67045b5a7f60671f579c14d4cb3e221b8a097849eb61208ce00a", kill_on_drop: false }`
[INFO] [stdout] 17dbc895bb9d67045b5a7f60671f579c14d4cb3e221b8a097849eb61208ce00a
[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=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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84b67e71e58fb710d91204216cfe332db3adf6fd70fbcc757e31549a4a76e2e2
[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" "84b67e71e58fb710d91204216cfe332db3adf6fd70fbcc757e31549a4a76e2e2", kill_on_drop: false }`
[INFO] [stderr] warning: path `/opt/rustwide/workdir/src/linked_list.rs` was erroneously implicitly accepted for binary `linked_list`,
[INFO] [stderr] please set bin.path in Cargo.toml
[INFO] [stderr]     Checking linked_list v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `delete_val`
[INFO] [stdout]   --> src/linked_list.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn delete_val(&self, val: &T) -> Option<Rc<LinkedList<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: `insert_val`
[INFO] [stdout]   --> src/linked_list.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn insert_val(&self, val: T) -> LinkedList<T> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `length`
[INFO] [stdout]   --> src/linked_list.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 |     fn length(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `find`
[INFO] [stdout]   --> src/linked_list.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn find(&self, val: T) -> Option<i32> {
[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 0.79s
[INFO] running `Command { std: "docker" "inspect" "84b67e71e58fb710d91204216cfe332db3adf6fd70fbcc757e31549a4a76e2e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84b67e71e58fb710d91204216cfe332db3adf6fd70fbcc757e31549a4a76e2e2", kill_on_drop: false }`
[INFO] [stdout] 84b67e71e58fb710d91204216cfe332db3adf6fd70fbcc757e31549a4a76e2e2