[INFO] updating cached repository Razakhel/rs-ds
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Razakhel/rs-ds
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Razakhel/rs-ds" "work/ex/beta-1.38-1/sources/1.37.0/gh/Razakhel/rs-ds"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Razakhel/rs-ds'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Razakhel/rs-ds" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Razakhel/rs-ds"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Razakhel/rs-ds'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7fad62cad817e09dbf5244be8a21479d641ec05a
[INFO] sha for GitHub repo Razakhel/rs-ds: 7fad62cad817e09dbf5244be8a21479d641ec05a
[INFO] validating manifest of Razakhel/rs-ds on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Razakhel/rs-ds on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Razakhel/rs-ds
[INFO] finished frobbing Razakhel/rs-ds
[INFO] frobbed toml for Razakhel/rs-ds written to work/ex/beta-1.38-1/sources/1.37.0/gh/Razakhel/rs-ds/Cargo.toml
[INFO] started frobbing Razakhel/rs-ds
[INFO] finished frobbing Razakhel/rs-ds
[INFO] frobbed toml for Razakhel/rs-ds written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Razakhel/rs-ds/Cargo.toml
[INFO] crate Razakhel/rs-ds already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Razakhel/rs-ds against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Razakhel/rs-ds:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 362af6d7bbaf3b5cf029458fb6d084ed2ff4ea047573fe41fdfd8039cfd39f87
[INFO] running `"docker" "start" "-a" "362af6d7bbaf3b5cf029458fb6d084ed2ff4ea047573fe41fdfd8039cfd39f87"`
[INFO] [stderr]    Compiling rs-ds v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `IntoIter`
[INFO] [stderr]   --> src/linked_list.rs:16:1
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub struct IntoIter<T>(List<T>);
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `peek`
[INFO] [stderr]   --> src/linked_list.rs:38:3
[INFO] [stderr]    |
[INFO] [stderr] 38 |   pub fn peek(&self) -> Option<&T> {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `peek_mut`
[INFO] [stderr]   --> src/linked_list.rs:44:3
[INFO] [stderr]    |
[INFO] [stderr] 44 |   pub fn peek_mut(&mut self) -> Option<&mut T> {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `into_iter`
[INFO] [stderr]   --> src/linked_list.rs:50:3
[INFO] [stderr]    |
[INFO] [stderr] 50 |   pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `"docker" "inspect" "362af6d7bbaf3b5cf029458fb6d084ed2ff4ea047573fe41fdfd8039cfd39f87"`
[INFO] running `"docker" "rm" "-f" "362af6d7bbaf3b5cf029458fb6d084ed2ff4ea047573fe41fdfd8039cfd39f87"`
[INFO] [stdout] 362af6d7bbaf3b5cf029458fb6d084ed2ff4ea047573fe41fdfd8039cfd39f87
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Razakhel/rs-ds:/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 306f93de83f1c4aa35e15aa8f62e0583f19150a1d8ca9947a3bf2b1f3d948578
[INFO] running `"docker" "start" "-a" "306f93de83f1c4aa35e15aa8f62e0583f19150a1d8ca9947a3bf2b1f3d948578"`
[INFO] [stderr]    Compiling rs-ds v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.36s
[INFO] running `"docker" "inspect" "306f93de83f1c4aa35e15aa8f62e0583f19150a1d8ca9947a3bf2b1f3d948578"`
[INFO] running `"docker" "rm" "-f" "306f93de83f1c4aa35e15aa8f62e0583f19150a1d8ca9947a3bf2b1f3d948578"`
[INFO] [stdout] 306f93de83f1c4aa35e15aa8f62e0583f19150a1d8ca9947a3bf2b1f3d948578
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Razakhel/rs-ds:/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 990a3663eabb9e4f0d53ec8b782d3b13416cf38f7cbe2a627b7ff08875933a83
[INFO] running `"docker" "start" "-a" "990a3663eabb9e4f0d53ec8b782d3b13416cf38f7cbe2a627b7ff08875933a83"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rs_ds-4fa786c7457dedcb
[INFO] [stdout] test linked_list::test::into_iter ... ok
[INFO] [stdout] test linked_list::test::push_pop ... ok
[INFO] [stdout] test linked_list::test::peek ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "990a3663eabb9e4f0d53ec8b782d3b13416cf38f7cbe2a627b7ff08875933a83"`
[INFO] running `"docker" "rm" "-f" "990a3663eabb9e4f0d53ec8b782d3b13416cf38f7cbe2a627b7ff08875933a83"`
[INFO] [stdout] 990a3663eabb9e4f0d53ec8b782d3b13416cf38f7cbe2a627b7ff08875933a83