[INFO] updating cached repository https://github.com/jaredonline/rust-skip-list
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 31e304a8a8ec2c917e47b7c4cfc3a84fe46768ea
[INFO] testing jaredonline/rust-skip-list against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaredonline%2Frust-skip-list" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jaredonline/rust-skip-list on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jaredonline/rust-skip-list
[INFO] finished tweaking git repo https://github.com/jaredonline/rust-skip-list
[INFO] tweaked toml for git repo https://github.com/jaredonline/rust-skip-list written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/jaredonline/rust-skip-list already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /big/crater/work/builds/worker-7/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] bc991c6eef5249580af7ea5f0af276c7412a0579387f38d2077d19d7e6ad0f64
[INFO] running `"docker" "start" "-a" "bc991c6eef5249580af7ea5f0af276c7412a0579387f38d2077d19d7e6ad0f64"`
[INFO] [stderr]    Compiling linked-list v0.1.0 (/opt/rustwide/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: 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 0.71s
[INFO] running `"docker" "inspect" "bc991c6eef5249580af7ea5f0af276c7412a0579387f38d2077d19d7e6ad0f64"`
[INFO] running `"docker" "rm" "-f" "bc991c6eef5249580af7ea5f0af276c7412a0579387f38d2077d19d7e6ad0f64"`
[INFO] [stdout] bc991c6eef5249580af7ea5f0af276c7412a0579387f38d2077d19d7e6ad0f64
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen" "--no-run"`
[INFO] [stdout] ae3eca71a7ca42edb2c579b3da2177ad21975fef2a9e28ed53f53f2bb3d10a4c
[INFO] running `"docker" "start" "-a" "ae3eca71a7ca42edb2c579b3da2177ad21975fef2a9e28ed53f53f2bb3d10a4c"`
[INFO] [stderr]    Compiling linked-list v0.1.0 (/opt/rustwide/workdir)
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.71s
[INFO] running `"docker" "inspect" "ae3eca71a7ca42edb2c579b3da2177ad21975fef2a9e28ed53f53f2bb3d10a4c"`
[INFO] running `"docker" "rm" "-f" "ae3eca71a7ca42edb2c579b3da2177ad21975fef2a9e28ed53f53f2bb3d10a4c"`
[INFO] [stdout] ae3eca71a7ca42edb2c579b3da2177ad21975fef2a9e28ed53f53f2bb3d10a4c
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen"`
[INFO] [stdout] 3bfc311e32fadb6ae1a1be0e1f39c311f864456c0942fa5b84cdb9f0525b9a2a
[INFO] running `"docker" "start" "-a" "3bfc311e32fadb6ae1a1be0e1f39c311f864456c0942fa5b84cdb9f0525b9a2a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/linked_list-f217b84a3b76f8b1
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test test::insert_increments_length ... ok
[INFO] [stdout] test test::nodes_should_not_leak ... ok
[INFO] [stdout] test test::insert_at_for_two_values ... ok
[INFO] [stdout] test test::many_inserts_and_iteration ... ok
[INFO] [stdout] test test::many_inserts ... ok
[INFO] [stdout] test test::insert_at_for_one_value ... ok
[INFO] [stdout] test test::many_inserts_lookup_iterations_should_be_less_than_items ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "3bfc311e32fadb6ae1a1be0e1f39c311f864456c0942fa5b84cdb9f0525b9a2a"`
[INFO] running `"docker" "rm" "-f" "3bfc311e32fadb6ae1a1be0e1f39c311f864456c0942fa5b84cdb9f0525b9a2a"`
[INFO] [stdout] 3bfc311e32fadb6ae1a1be0e1f39c311f864456c0942fa5b84cdb9f0525b9a2a