[INFO] updating cached repository jaredonline/rust-skip-list
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jaredonline/rust-skip-list
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jaredonline/rust-skip-list" "work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jaredonline/rust-skip-list"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jaredonline/rust-skip-list'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jaredonline/rust-skip-list" "work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/jaredonline/rust-skip-list"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/jaredonline/rust-skip-list'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 31e304a8a8ec2c917e47b7c4cfc3a84fe46768ea
[INFO] sha for GitHub repo jaredonline/rust-skip-list: 31e304a8a8ec2c917e47b7c4cfc3a84fe46768ea
[INFO] validating manifest of jaredonline/rust-skip-list on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jaredonline/rust-skip-list on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jaredonline/rust-skip-list
[INFO] finished frobbing jaredonline/rust-skip-list
[INFO] frobbed toml for jaredonline/rust-skip-list written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jaredonline/rust-skip-list/Cargo.toml
[INFO] started frobbing jaredonline/rust-skip-list
[INFO] finished frobbing jaredonline/rust-skip-list
[INFO] frobbed toml for jaredonline/rust-skip-list written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/jaredonline/rust-skip-list/Cargo.toml
[INFO] crate jaredonline/rust-skip-list already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jaredonline/rust-skip-list/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking jaredonline/rust-skip-list against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-3/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jaredonline/rust-skip-list:/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" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 1a00c492d416619ed277594e44dd9c273441df65d136b16e0685c435b4b83bf5
[INFO] running `"docker" "start" "-a" "1a00c492d416619ed277594e44dd9c273441df65d136b16e0685c435b4b83bf5"`
[INFO] [stderr]     Checking linked-list v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:235:14
[INFO] [stderr]     |
[INFO] [stderr] 235 |     for i in (0 .. 10) {
[INFO] [stderr]     |              ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:245:14
[INFO] [stderr]     |
[INFO] [stderr] 245 |     for i in (0 .. 10) {
[INFO] [stderr]     |              ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:259:14
[INFO] [stderr]     |
[INFO] [stderr] 259 |     for i in (0 .. 10) {
[INFO] [stderr]     |              ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:265:14
[INFO] [stderr]     |
[INFO] [stderr] 265 |     for i in (0 .. 100) {
[INFO] [stderr]     |              ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:301:18
[INFO] [stderr]     |
[INFO] [stderr] 301 |         for i in (0 .. 100) {
[INFO] [stderr]     |                  ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:305:18
[INFO] [stderr]     |
[INFO] [stderr] 305 |         for i in (0 .. 100) {
[INFO] [stderr]     |                  ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:313:18
[INFO] [stderr]     |
[INFO] [stderr] 313 |         for i in (0 .. 100) {
[INFO] [stderr]     |                  ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:328:18
[INFO] [stderr]     |
[INFO] [stderr] 328 |         for i in (1 .. 1000) {
[INFO] [stderr]     |                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]    --> src/main.rs:344:22
[INFO] [stderr]     |
[INFO] [stderr] 344 |             for i in (0 .. 7) {
[INFO] [stderr]     |                      ^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_node_count`
[INFO] [stderr]   --> src/main.rs:97:1
[INFO] [stderr]    |
[INFO] [stderr] 97 | fn get_node_count() -> usize {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.85s
[INFO] running `"docker" "inspect" "1a00c492d416619ed277594e44dd9c273441df65d136b16e0685c435b4b83bf5"`
[INFO] running `"docker" "rm" "-f" "1a00c492d416619ed277594e44dd9c273441df65d136b16e0685c435b4b83bf5"`
[INFO] [stdout] 1a00c492d416619ed277594e44dd9c273441df65d136b16e0685c435b4b83bf5