[INFO] updating cached repository kylehz/datastruct-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kylehz/datastruct-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kylehz/datastruct-rs" "work/ex/beta-1.37-6/sources/1.36.0/gh/kylehz/datastruct-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/kylehz/datastruct-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kylehz/datastruct-rs" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kylehz/datastruct-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kylehz/datastruct-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a3f3651406dca899435da60d92024842face5a92
[INFO] sha for GitHub repo kylehz/datastruct-rs: a3f3651406dca899435da60d92024842face5a92
[INFO] validating manifest of kylehz/datastruct-rs on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of kylehz/datastruct-rs on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing kylehz/datastruct-rs
[INFO] finished frobbing kylehz/datastruct-rs
[INFO] frobbed toml for kylehz/datastruct-rs written to work/ex/beta-1.37-6/sources/1.36.0/gh/kylehz/datastruct-rs/Cargo.toml
[INFO] started frobbing kylehz/datastruct-rs
[INFO] finished frobbing kylehz/datastruct-rs
[INFO] frobbed toml for kylehz/datastruct-rs written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kylehz/datastruct-rs/Cargo.toml
[INFO] crate kylehz/datastruct-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing kylehz/datastruct-rs against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kylehz/datastruct-rs:/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=warn" "-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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 28505ddc96e6e90453f966c3ebf8def13659a4c535bbe10f53dae5836422daf1
[INFO] running `"docker" "start" "-a" "28505ddc96e6e90453f966c3ebf8def13659a4c535bbe10f53dae5836422daf1"`
[INFO] [stderr]    Compiling datastruct-rs v0.1.0 (/opt/crater/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 0.49s
[INFO] running `"docker" "inspect" "28505ddc96e6e90453f966c3ebf8def13659a4c535bbe10f53dae5836422daf1"`
[INFO] running `"docker" "rm" "-f" "28505ddc96e6e90453f966c3ebf8def13659a4c535bbe10f53dae5836422daf1"`
[INFO] [stdout] 28505ddc96e6e90453f966c3ebf8def13659a4c535bbe10f53dae5836422daf1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kylehz/datastruct-rs:/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=warn" "-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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] fc639340a1293a66688044f9352e63631fa24a15b0687c291c2b10d60bc6b27c
[INFO] running `"docker" "start" "-a" "fc639340a1293a66688044f9352e63631fa24a15b0687c291c2b10d60bc6b27c"`
[INFO] [stderr]    Compiling datastruct-rs v0.1.0 (/opt/crater/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 1.49s
[INFO] running `"docker" "inspect" "fc639340a1293a66688044f9352e63631fa24a15b0687c291c2b10d60bc6b27c"`
[INFO] running `"docker" "rm" "-f" "fc639340a1293a66688044f9352e63631fa24a15b0687c291c2b10d60bc6b27c"`
[INFO] [stdout] fc639340a1293a66688044f9352e63631fa24a15b0687c291c2b10d60bc6b27c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kylehz/datastruct-rs:/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=warn" "-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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 0a8e76344ed4f2e1a43d95211262bb19087b43d2830f930d84741c6d92f27e2e
[INFO] running `"docker" "start" "-a" "0a8e76344ed4f2e1a43d95211262bb19087b43d2830f930d84741c6d92f27e2e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/datastruct_rs-2c1f1ea9a7e096fa
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test linked_list::tests::test2 ... ok
[INFO] [stdout] test linked_list::tests::test1 ... ok
[INFO] [stdout] test vec_deque::tests::test1 ... ok
[INFO] [stdout] test stack::tests::stack_test ... ok
[INFO] [stdout] test binary_search_tree::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" "0a8e76344ed4f2e1a43d95211262bb19087b43d2830f930d84741c6d92f27e2e"`
[INFO] running `"docker" "rm" "-f" "0a8e76344ed4f2e1a43d95211262bb19087b43d2830f930d84741c6d92f27e2e"`
[INFO] [stdout] 0a8e76344ed4f2e1a43d95211262bb19087b43d2830f930d84741c6d92f27e2e