[INFO] updating cached repository nicofff/topsort
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nicofff/topsort
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nicofff/topsort" "work/ex/beta-1.38-1/sources/1.37.0/gh/nicofff/topsort"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/nicofff/topsort'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nicofff/topsort" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nicofff/topsort"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nicofff/topsort'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f498230bd9b4e178a698d8a5e0458e32140ac468
[INFO] sha for GitHub repo nicofff/topsort: f498230bd9b4e178a698d8a5e0458e32140ac468
[INFO] validating manifest of nicofff/topsort 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 nicofff/topsort 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 nicofff/topsort
[INFO] finished frobbing nicofff/topsort
[INFO] frobbed toml for nicofff/topsort written to work/ex/beta-1.38-1/sources/1.37.0/gh/nicofff/topsort/Cargo.toml
[INFO] started frobbing nicofff/topsort
[INFO] finished frobbing nicofff/topsort
[INFO] frobbed toml for nicofff/topsort written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nicofff/topsort/Cargo.toml
[INFO] crate nicofff/topsort 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 nicofff/topsort against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/nicofff/topsort:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] da324212a9030716ba7abcf1bdefe85244c3e77bb4bdac9d4546d3b428aea180
[INFO] running `"docker" "start" "-a" "da324212a9030716ba7abcf1bdefe85244c3e77bb4bdac9d4546d3b428aea180"`
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling csv-core v0.1.5
[INFO] [stderr]    Compiling csv v1.0.5
[INFO] [stderr]    Compiling topsort v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `get`
[INFO] [stderr]   --> src/topsort/multi_btreemap.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     pub fn get(&self, k: &K) -> Option<&Vec<String>> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut`
[INFO] [stderr]   --> src/topsort/multi_btreemap.rs:53:5
[INFO] [stderr]    |
[INFO] [stderr] 53 |     pub fn get_mut(&mut self, k: &K) -> Option<&mut Vec<String>> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.23s
[INFO] running `"docker" "inspect" "da324212a9030716ba7abcf1bdefe85244c3e77bb4bdac9d4546d3b428aea180"`
[INFO] running `"docker" "rm" "-f" "da324212a9030716ba7abcf1bdefe85244c3e77bb4bdac9d4546d3b428aea180"`
[INFO] [stdout] da324212a9030716ba7abcf1bdefe85244c3e77bb4bdac9d4546d3b428aea180
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/nicofff/topsort:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] ae376f9b3d320c074e8030a1c8df85e808d97b86166e52b96043d185faf86253
[INFO] running `"docker" "start" "-a" "ae376f9b3d320c074e8030a1c8df85e808d97b86166e52b96043d185faf86253"`
[INFO] [stderr]    Compiling topsort v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `get`
[INFO] [stderr]   --> src/topsort/multi_btreemap.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     pub fn get(&self, k: &K) -> Option<&Vec<String>> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut`
[INFO] [stderr]   --> src/topsort/multi_btreemap.rs:53:5
[INFO] [stderr]    |
[INFO] [stderr] 53 |     pub fn get_mut(&mut self, k: &K) -> Option<&mut Vec<String>> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.02s
[INFO] running `"docker" "inspect" "ae376f9b3d320c074e8030a1c8df85e808d97b86166e52b96043d185faf86253"`
[INFO] running `"docker" "rm" "-f" "ae376f9b3d320c074e8030a1c8df85e808d97b86166e52b96043d185faf86253"`
[INFO] [stdout] ae376f9b3d320c074e8030a1c8df85e808d97b86166e52b96043d185faf86253
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/nicofff/topsort:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] d5e36dc2ce49df2e650dad4dca95d01ce7b6e5a390550986e513d0b2c2e86697
[INFO] running `"docker" "start" "-a" "d5e36dc2ce49df2e650dad4dca95d01ce7b6e5a390550986e513d0b2c2e86697"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/topsort-5f1e9ad051c32755
[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" "d5e36dc2ce49df2e650dad4dca95d01ce7b6e5a390550986e513d0b2c2e86697"`
[INFO] running `"docker" "rm" "-f" "d5e36dc2ce49df2e650dad4dca95d01ce7b6e5a390550986e513d0b2c2e86697"`
[INFO] [stdout] d5e36dc2ce49df2e650dad4dca95d01ce7b6e5a390550986e513d0b2c2e86697