[INFO] updating cached repository varzac/rust_collections
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/varzac/rust_collections
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/varzac/rust_collections" "work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/varzac/rust_collections"`
[INFO] [stderr] Cloning into 'work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/varzac/rust_collections'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/varzac/rust_collections" "work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/varzac/rust_collections"`
[INFO] [stderr] Cloning into 'work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/varzac/rust_collections'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] db1285199d9300d32cdd25281583753dc1de814d
[INFO] sha for GitHub repo varzac/rust_collections: db1285199d9300d32cdd25281583753dc1de814d
[INFO] validating manifest of varzac/rust_collections on toolchain master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f613dc138b4012cf3d2eb40718fbcc7cf0a34039-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of varzac/rust_collections on toolchain try#29640c57b5f92febba0e40c50cb863c9a7ede51d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing varzac/rust_collections
[INFO] finished frobbing varzac/rust_collections
[INFO] frobbed toml for varzac/rust_collections written to work/ex/pr-57745/sources/master#f613dc138b4012cf3d2eb40718fbcc7cf0a34039/gh/varzac/rust_collections/Cargo.toml
[INFO] started frobbing varzac/rust_collections
[INFO] finished frobbing varzac/rust_collections
[INFO] frobbed toml for varzac/rust_collections written to work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/varzac/rust_collections/Cargo.toml
[INFO] crate varzac/rust_collections has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f613dc138b4012cf3d2eb40718fbcc7cf0a34039-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking varzac/rust_collections against try#29640c57b5f92febba0e40c50cb863c9a7ede51d for pr-57745
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57745/worker-2/try#29640c57b5f92febba0e40c50cb863c9a7ede51d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57745/sources/try#29640c57b5f92febba0e40c50cb863c9a7ede51d/gh/varzac/rust_collections:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+29640c57b5f92febba0e40c50cb863c9a7ede51d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] cc48b4cc8256ef7a780dcf9ef8bcfb6b77d02ec11fdaf9fd8db0fa717b36b06a
[INFO] running `"docker" "start" "-a" "cc48b4cc8256ef7a780dcf9ef8bcfb6b77d02ec11fdaf9fd8db0fa717b36b06a"`
[INFO] [stderr] warning: path `/opt/crater/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/crater/workdir)
[INFO] [stderr] warning: method is never used: `delete_val`
[INFO] [stderr]   --> src/linked_list.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn delete_val(&self, val: &T) -> Option<Rc<LinkedList<T>>> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `insert_val`
[INFO] [stderr]   --> src/linked_list.rs:38:5
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn insert_val(&self, val: T) -> LinkedList<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `length`
[INFO] [stderr]   --> src/linked_list.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     fn length(&self) -> i32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find`
[INFO] [stderr]   --> src/linked_list.rs:66:5
[INFO] [stderr]    |
[INFO] [stderr] 66 |     fn find(&self, val: T) -> Option<i32> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.43s
[INFO] running `"docker" "inspect" "cc48b4cc8256ef7a780dcf9ef8bcfb6b77d02ec11fdaf9fd8db0fa717b36b06a"`
[INFO] running `"docker" "rm" "-f" "cc48b4cc8256ef7a780dcf9ef8bcfb6b77d02ec11fdaf9fd8db0fa717b36b06a"`
[INFO] [stdout] cc48b4cc8256ef7a780dcf9ef8bcfb6b77d02ec11fdaf9fd8db0fa717b36b06a