[INFO] updating cached repository magiccrafter/hr-balanced-brackets
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/magiccrafter/hr-balanced-brackets
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/magiccrafter/hr-balanced-brackets" "work/ex/beta-1.38-1/sources/1.37.0/gh/magiccrafter/hr-balanced-brackets"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/magiccrafter/hr-balanced-brackets'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/magiccrafter/hr-balanced-brackets" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/magiccrafter/hr-balanced-brackets"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/magiccrafter/hr-balanced-brackets'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c7e247014b745edb45c635fc50c5cf06f27e6369
[INFO] sha for GitHub repo magiccrafter/hr-balanced-brackets: c7e247014b745edb45c635fc50c5cf06f27e6369
[INFO] validating manifest of magiccrafter/hr-balanced-brackets 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 magiccrafter/hr-balanced-brackets 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 magiccrafter/hr-balanced-brackets
[INFO] finished frobbing magiccrafter/hr-balanced-brackets
[INFO] frobbed toml for magiccrafter/hr-balanced-brackets written to work/ex/beta-1.38-1/sources/1.37.0/gh/magiccrafter/hr-balanced-brackets/Cargo.toml
[INFO] started frobbing magiccrafter/hr-balanced-brackets
[INFO] finished frobbing magiccrafter/hr-balanced-brackets
[INFO] frobbed toml for magiccrafter/hr-balanced-brackets written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/magiccrafter/hr-balanced-brackets/Cargo.toml
[INFO] crate magiccrafter/hr-balanced-brackets 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 magiccrafter/hr-balanced-brackets 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-5/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/magiccrafter/hr-balanced-brackets:/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] 92f97c1691a7bc50b4d07195b2510d7ee23facce476c9d6839ee54c3075fec16
[INFO] running `"docker" "start" "-a" "92f97c1691a7bc50b4d07195b2510d7ee23facce476c9d6839ee54c3075fec16"`
[INFO] [stderr]    Compiling hr-balanced-brackets v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `n` is assigned to, but never used
[INFO] [stderr]   --> src/main.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let mut n: i32 = 0;
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_n` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `n` is never read
[INFO] [stderr]   --> src/main.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |             n = line.parse().unwrap(); // first line is the size of the test data input
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `idx`
[INFO] [stderr]   --> src/main.rs:48:14
[INFO] [stderr]    |
[INFO] [stderr] 48 |         for (idx, ch) in bracket.char_indices() {
[INFO] [stderr]    |              ^^^ help: consider prefixing with an underscore: `_idx`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.24s
[INFO] running `"docker" "inspect" "92f97c1691a7bc50b4d07195b2510d7ee23facce476c9d6839ee54c3075fec16"`
[INFO] running `"docker" "rm" "-f" "92f97c1691a7bc50b4d07195b2510d7ee23facce476c9d6839ee54c3075fec16"`
[INFO] [stdout] 92f97c1691a7bc50b4d07195b2510d7ee23facce476c9d6839ee54c3075fec16
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/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/magiccrafter/hr-balanced-brackets:/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] 966b97ba3eb3b79f95a51dce8bb4254d450da612907dc409f2548bb2cf7fbeb6
[INFO] running `"docker" "start" "-a" "966b97ba3eb3b79f95a51dce8bb4254d450da612907dc409f2548bb2cf7fbeb6"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling hr-balanced-brackets v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `n` is assigned to, but never used
[INFO] [stderr]   --> src/main.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let mut n: i32 = 0;
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_n` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `n` is never read
[INFO] [stderr]   --> src/main.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |             n = line.parse().unwrap(); // first line is the size of the test data input
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `idx`
[INFO] [stderr]   --> src/main.rs:48:14
[INFO] [stderr]    |
[INFO] [stderr] 48 |         for (idx, ch) in bracket.char_indices() {
[INFO] [stderr]    |              ^^^ help: consider prefixing with an underscore: `_idx`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.72s
[INFO] running `"docker" "inspect" "966b97ba3eb3b79f95a51dce8bb4254d450da612907dc409f2548bb2cf7fbeb6"`
[INFO] running `"docker" "rm" "-f" "966b97ba3eb3b79f95a51dce8bb4254d450da612907dc409f2548bb2cf7fbeb6"`
[INFO] [stdout] 966b97ba3eb3b79f95a51dce8bb4254d450da612907dc409f2548bb2cf7fbeb6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/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/magiccrafter/hr-balanced-brackets:/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] 404dc8fb6ac4416b16e81ea91cea355756d5e5fb04bcda3c01acbddcd80da4ac
[INFO] running `"docker" "start" "-a" "404dc8fb6ac4416b16e81ea91cea355756d5e5fb04bcda3c01acbddcd80da4ac"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/hr_balanced_brackets-96801347e0af0dcc
[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" "404dc8fb6ac4416b16e81ea91cea355756d5e5fb04bcda3c01acbddcd80da4ac"`
[INFO] running `"docker" "rm" "-f" "404dc8fb6ac4416b16e81ea91cea355756d5e5fb04bcda3c01acbddcd80da4ac"`
[INFO] [stdout] 404dc8fb6ac4416b16e81ea91cea355756d5e5fb04bcda3c01acbddcd80da4ac