[INFO] updating cached repository old-student/algorithms1-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/old-student/algorithms1-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/old-student/algorithms1-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/old-student/algorithms1-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/old-student/algorithms1-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/old-student/algorithms1-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/old-student/algorithms1-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/old-student/algorithms1-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9539fc06f275c37625a51292eb06c72621639517
[INFO] sha for GitHub repo old-student/algorithms1-rust: 9539fc06f275c37625a51292eb06c72621639517
[INFO] validating manifest of old-student/algorithms1-rust 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 old-student/algorithms1-rust 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 old-student/algorithms1-rust
[INFO] finished frobbing old-student/algorithms1-rust
[INFO] frobbed toml for old-student/algorithms1-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/old-student/algorithms1-rust/Cargo.toml
[INFO] started frobbing old-student/algorithms1-rust
[INFO] finished frobbing old-student/algorithms1-rust
[INFO] frobbed toml for old-student/algorithms1-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/old-student/algorithms1-rust/Cargo.toml
[INFO] crate old-student/algorithms1-rust 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/old-student/algorithms1-rust/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing old-student/algorithms1-rust 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-7/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/old-student/algorithms1-rust:/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] 40e5daca1417e6b133c61b94b9093345626a8f5ecbde0b0bb4652137a5794966
[INFO] running `"docker" "start" "-a" "40e5daca1417e6b133c61b94b9093345626a8f5ecbde0b0bb4652137a5794966"`
[INFO] [stderr]    Compiling algorithms v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/inversions_counter/mod.rs:65:18
[INFO] [stderr]    |
[INFO] [stderr] 65 |         for i in (begin_left..end_right+1) {
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.10s
[INFO] running `"docker" "inspect" "40e5daca1417e6b133c61b94b9093345626a8f5ecbde0b0bb4652137a5794966"`
[INFO] running `"docker" "rm" "-f" "40e5daca1417e6b133c61b94b9093345626a8f5ecbde0b0bb4652137a5794966"`
[INFO] [stdout] 40e5daca1417e6b133c61b94b9093345626a8f5ecbde0b0bb4652137a5794966
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/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/old-student/algorithms1-rust:/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] 838478131e655567164d8abd488c618c65a79160d121d89fdea2b3362f488e89
[INFO] running `"docker" "start" "-a" "838478131e655567164d8abd488c618c65a79160d121d89fdea2b3362f488e89"`
[INFO] [stderr]    Compiling algorithms v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/inversions_counter/mod.rs:65:18
[INFO] [stderr]    |
[INFO] [stderr] 65 |         for i in (begin_left..end_right+1) {
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
[INFO] running `"docker" "inspect" "838478131e655567164d8abd488c618c65a79160d121d89fdea2b3362f488e89"`
[INFO] running `"docker" "rm" "-f" "838478131e655567164d8abd488c618c65a79160d121d89fdea2b3362f488e89"`
[INFO] [stdout] 838478131e655567164d8abd488c618c65a79160d121d89fdea2b3362f488e89
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/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/old-student/algorithms1-rust:/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] fd5be04e0af40f95dfeb1a80d6470dac898ff6e7d652cae849b5254d9764e9a7
[INFO] running `"docker" "start" "-a" "fd5be04e0af40f95dfeb1a80d6470dac898ff6e7d652cae849b5254d9764e9a7"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/algorithms-ab26cc9edf1ccaa0
[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" "fd5be04e0af40f95dfeb1a80d6470dac898ff6e7d652cae849b5254d9764e9a7"`
[INFO] running `"docker" "rm" "-f" "fd5be04e0af40f95dfeb1a80d6470dac898ff6e7d652cae849b5254d9764e9a7"`
[INFO] [stdout] fd5be04e0af40f95dfeb1a80d6470dac898ff6e7d652cae849b5254d9764e9a7