[INFO] cloning repository kylehz/datastruct-rs
[INFO] running `"git" "clone" "--bare" "git://github.com/kylehz/datastruct-rs.git" "work/cache/sources/gh/kylehz/datastruct-rs"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/kylehz/datastruct-rs'...
[INFO] running `"git" "clone" "work/cache/sources/gh/kylehz/datastruct-rs" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/kylehz/datastruct-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/kylehz/datastruct-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kylehz/datastruct-rs" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/kylehz/datastruct-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/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 master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of kylehz/datastruct-rs on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "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/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/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/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/kylehz/datastruct-rs/Cargo.toml
[INFO] crate kylehz/datastruct-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking kylehz/datastruct-rs against try#8f81d0bf6baf07b92f1246696722485c4ca0b049 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-2/try#8f81d0bf6baf07b92f1246696722485c4ca0b049:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/kylehz/datastruct-rs:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] ad5aea3fbb9cd2e2359d9b729d0a7e91bf0d1ddcbddab357108a7d4c075e7e33
[INFO] running `"docker" "start" "-a" "ad5aea3fbb9cd2e2359d9b729d0a7e91bf0d1ddcbddab357108a7d4c075e7e33"`
[INFO] [stderr]     Checking 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] 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 1.05s
[INFO] running `"docker" "inspect" "ad5aea3fbb9cd2e2359d9b729d0a7e91bf0d1ddcbddab357108a7d4c075e7e33"`
[INFO] running `"docker" "rm" "-f" "ad5aea3fbb9cd2e2359d9b729d0a7e91bf0d1ddcbddab357108a7d4c075e7e33"`
[INFO] [stdout] ad5aea3fbb9cd2e2359d9b729d0a7e91bf0d1ddcbddab357108a7d4c075e7e33