[INFO] updating cached repository McGiver-/rust_practice
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/McGiver-/rust_practice
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/McGiver-/rust_practice" "work/ex/beta-1.38-1/sources/1.37.0/gh/McGiver-/rust_practice"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/McGiver-/rust_practice'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/McGiver-/rust_practice" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/McGiver-/rust_practice"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/McGiver-/rust_practice'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c8a73d658f33fc5ce21503726c9815dba08bf932
[INFO] sha for GitHub repo McGiver-/rust_practice: c8a73d658f33fc5ce21503726c9815dba08bf932
[INFO] validating manifest of McGiver-/rust_practice 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 McGiver-/rust_practice 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 McGiver-/rust_practice
[INFO] finished frobbing McGiver-/rust_practice
[INFO] frobbed toml for McGiver-/rust_practice written to work/ex/beta-1.38-1/sources/1.37.0/gh/McGiver-/rust_practice/Cargo.toml
[INFO] started frobbing McGiver-/rust_practice
[INFO] finished frobbing McGiver-/rust_practice
[INFO] frobbed toml for McGiver-/rust_practice written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/McGiver-/rust_practice/Cargo.toml
[INFO] crate McGiver-/rust_practice 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing McGiver-/rust_practice 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/McGiver-/rust_practice:/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] 7f0d57f206258575f6d93b9bcdf59200211781881e435f25a7914189cfc03b78
[INFO] running `"docker" "start" "-a" "7f0d57f206258575f6d93b9bcdf59200211781881e435f25a7914189cfc03b78"`
[INFO] [stderr]    Compiling validate_palindrome v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]   --> src/main.rs:31:28
[INFO] [stderr]    |
[INFO] [stderr] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stderr]    |                            ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `map`
[INFO] [stderr]   --> src/main.rs:31:36
[INFO] [stderr]    |
[INFO] [stderr] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_map`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `"docker" "inspect" "7f0d57f206258575f6d93b9bcdf59200211781881e435f25a7914189cfc03b78"`
[INFO] running `"docker" "rm" "-f" "7f0d57f206258575f6d93b9bcdf59200211781881e435f25a7914189cfc03b78"`
[INFO] [stdout] 7f0d57f206258575f6d93b9bcdf59200211781881e435f25a7914189cfc03b78
[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/McGiver-/rust_practice:/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] 6c73ae3143baa57a2405a65c4e96ef8d9d84ae8163d63c4ae1aedc026ce70609
[INFO] running `"docker" "start" "-a" "6c73ae3143baa57a2405a65c4e96ef8d9d84ae8163d63c4ae1aedc026ce70609"`
[INFO] [stderr]    Compiling validate_palindrome v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]   --> src/main.rs:31:28
[INFO] [stderr]    |
[INFO] [stderr] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stderr]    |                            ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `map`
[INFO] [stderr]   --> src/main.rs:31:36
[INFO] [stderr]    |
[INFO] [stderr] 31 | pub fn bracket_balanced<T>(v: &[T],map: HashMap<T,T>) -> bool where
[INFO] [stderr]    |                                    ^^^ help: consider prefixing with an underscore: `_map`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.16s
[INFO] running `"docker" "inspect" "6c73ae3143baa57a2405a65c4e96ef8d9d84ae8163d63c4ae1aedc026ce70609"`
[INFO] running `"docker" "rm" "-f" "6c73ae3143baa57a2405a65c4e96ef8d9d84ae8163d63c4ae1aedc026ce70609"`
[INFO] [stdout] 6c73ae3143baa57a2405a65c4e96ef8d9d84ae8163d63c4ae1aedc026ce70609
[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/McGiver-/rust_practice:/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] 81ada295aac1aee764fe73b42fadbf3d6bfd9cf69ae4e4255914d0299e37b90d
[INFO] running `"docker" "start" "-a" "81ada295aac1aee764fe73b42fadbf3d6bfd9cf69ae4e4255914d0299e37b90d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/validate_palindrome-be0df9a97b089981
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test tests::balanced_failures ... ok
[INFO] [stdout] test tests::balanced_passes ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "81ada295aac1aee764fe73b42fadbf3d6bfd9cf69ae4e4255914d0299e37b90d"`
[INFO] running `"docker" "rm" "-f" "81ada295aac1aee764fe73b42fadbf3d6bfd9cf69ae4e4255914d0299e37b90d"`
[INFO] [stdout] 81ada295aac1aee764fe73b42fadbf3d6bfd9cf69ae4e4255914d0299e37b90d