[INFO] updating cached repository https://github.com/kylehz/datastruct-rs
[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] a3f3651406dca899435da60d92024842face5a92
[INFO] testing kylehz/datastruct-rs against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkylehz%2Fdatastruct-rs" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kylehz/datastruct-rs 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/kylehz/datastruct-rs
[INFO] finished tweaking git repo https://github.com/kylehz/datastruct-rs
[INFO] tweaked toml for git repo https://github.com/kylehz/datastruct-rs written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/kylehz/datastruct-rs 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] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/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] ea35e8afd01490a03492ad6c8af2e40fb1a02418a7efb4ae6847dea53d59944d
[INFO] running `"docker" "start" "-a" "ea35e8afd01490a03492ad6c8af2e40fb1a02418a7efb4ae6847dea53d59944d"`
[INFO] [stderr]    Compiling datastruct-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/vec_deque.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |         for i in 0..additional {
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/linked_list.rs:40:13
[INFO] [stderr]    |
[INFO] [stderr] 40 |         let mut node = Node::new(elem);
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/linked_list.rs:75:13
[INFO] [stderr]    |
[INFO] [stderr] 75 |         let mut node = Node::new(elem);
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `len`
[INFO] [stderr]   --> src/linked_list.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     len: 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 0.75s
[INFO] running `"docker" "inspect" "ea35e8afd01490a03492ad6c8af2e40fb1a02418a7efb4ae6847dea53d59944d"`
[INFO] running `"docker" "rm" "-f" "ea35e8afd01490a03492ad6c8af2e40fb1a02418a7efb4ae6847dea53d59944d"`
[INFO] [stdout] ea35e8afd01490a03492ad6c8af2e40fb1a02418a7efb4ae6847dea53d59944d
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/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] 07f62d55d1fb374c8856a9e6161abeafc9cea23416420e2dacfb392fbc8dc38c
[INFO] running `"docker" "start" "-a" "07f62d55d1fb374c8856a9e6161abeafc9cea23416420e2dacfb392fbc8dc38c"`
[INFO] [stderr]    Compiling datastruct-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/vec_deque.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |         for i in 0..additional {
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/linked_list.rs:40:13
[INFO] [stderr]    |
[INFO] [stderr] 40 |         let mut node = Node::new(elem);
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/linked_list.rs:75:13
[INFO] [stderr]    |
[INFO] [stderr] 75 |         let mut node = Node::new(elem);
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `len`
[INFO] [stderr]   --> src/linked_list.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     len: 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 2.11s
[INFO] running `"docker" "inspect" "07f62d55d1fb374c8856a9e6161abeafc9cea23416420e2dacfb392fbc8dc38c"`
[INFO] running `"docker" "rm" "-f" "07f62d55d1fb374c8856a9e6161abeafc9cea23416420e2dacfb392fbc8dc38c"`
[INFO] [stdout] 07f62d55d1fb374c8856a9e6161abeafc9cea23416420e2dacfb392fbc8dc38c
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/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] 03b00d805268b5409e524f977482f6bc38597a53aee2d9a85b6893d6cc4f04ea
[INFO] running `"docker" "start" "-a" "03b00d805268b5409e524f977482f6bc38597a53aee2d9a85b6893d6cc4f04ea"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/datastruct_rs-9049d85bfd2c8187
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test stack::tests::stack_test ... ok
[INFO] [stdout] test vec_deque::tests::test1 ... ok
[INFO] [stdout] test linked_list::tests::test2 ... ok
[INFO] [stdout] test binary_search_tree::tests::test1 ... ok
[INFO] [stdout] test linked_list::tests::test1 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests datastruct-rs
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "03b00d805268b5409e524f977482f6bc38597a53aee2d9a85b6893d6cc4f04ea"`
[INFO] running `"docker" "rm" "-f" "03b00d805268b5409e524f977482f6bc38597a53aee2d9a85b6893d6cc4f04ea"`
[INFO] [stdout] 03b00d805268b5409e524f977482f6bc38597a53aee2d9a85b6893d6cc4f04ea