[INFO] updating cached repository Nalleyer/rust_99_problem
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Nalleyer/rust_99_problem
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Nalleyer/rust_99_problem" "work/ex/beta-1.37-6/sources/1.36.0/gh/Nalleyer/rust_99_problem"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/Nalleyer/rust_99_problem'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Nalleyer/rust_99_problem" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Nalleyer/rust_99_problem"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Nalleyer/rust_99_problem'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 963a80b26b71b2cb375922c8d99b1096e715d0e5
[INFO] sha for GitHub repo Nalleyer/rust_99_problem: 963a80b26b71b2cb375922c8d99b1096e715d0e5
[INFO] validating manifest of Nalleyer/rust_99_problem on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Nalleyer/rust_99_problem on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Nalleyer/rust_99_problem
[INFO] finished frobbing Nalleyer/rust_99_problem
[INFO] frobbed toml for Nalleyer/rust_99_problem written to work/ex/beta-1.37-6/sources/1.36.0/gh/Nalleyer/rust_99_problem/Cargo.toml
[INFO] started frobbing Nalleyer/rust_99_problem
[INFO] finished frobbing Nalleyer/rust_99_problem
[INFO] frobbed toml for Nalleyer/rust_99_problem written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Nalleyer/rust_99_problem/Cargo.toml
[INFO] crate Nalleyer/rust_99_problem already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Nalleyer/rust_99_problem against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/Nalleyer/rust_99_problem:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] a4f590aa4cb368bbaa2c387ffb230c0d94638db1a27f48211093eed6ce83ed2b
[INFO] running `"docker" "start" "-a" "a4f590aa4cb368bbaa2c387ffb230c0d94638db1a27f48211093eed6ce83ed2b"`
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling env_logger v0.6.1
[INFO] [stderr]    Compiling quickcheck v0.8.2
[INFO] [stderr]    Compiling quickcheck_macros v0.8.0
[INFO] [stderr]    Compiling rust_99_problem v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/solves/p7.rs:14:24
[INFO] [stderr]    |
[INFO] [stderr] 14 |             Node::Item(x) => vec!(node.clone()),
[INFO] [stderr]    |                        ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `is_item`
[INFO] [stderr]   --> src/common.rs:14:13
[INFO] [stderr]    |
[INFO] [stderr] 14 |         let is_item: bool = g.gen();
[INFO] [stderr]    |             ^^^^^^^ help: consider prefixing with an underscore: `_is_item`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `flat`
[INFO] [stderr]   --> src/solves/p7.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn flat<T: Clone>(ls: &List<T>) -> List<T> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.28s
[INFO] running `"docker" "inspect" "a4f590aa4cb368bbaa2c387ffb230c0d94638db1a27f48211093eed6ce83ed2b"`
[INFO] running `"docker" "rm" "-f" "a4f590aa4cb368bbaa2c387ffb230c0d94638db1a27f48211093eed6ce83ed2b"`
[INFO] [stdout] a4f590aa4cb368bbaa2c387ffb230c0d94638db1a27f48211093eed6ce83ed2b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/Nalleyer/rust_99_problem:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] d352af591f30981682d815530140aa3daa3a9211c0b0e8755f0a7a57e9d31729
[INFO] running `"docker" "start" "-a" "d352af591f30981682d815530140aa3daa3a9211c0b0e8755f0a7a57e9d31729"`
[INFO] [stderr]    Compiling rust_99_problem v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 | #[macro_use(quickcheck)]
[INFO] [stderr]   |             ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/solves/p7.rs:14:24
[INFO] [stderr]    |
[INFO] [stderr] 14 |             Node::Item(x) => vec!(node.clone()),
[INFO] [stderr]    |                        ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `is_item`
[INFO] [stderr]   --> src/common.rs:14:13
[INFO] [stderr]    |
[INFO] [stderr] 14 |         let is_item: bool = g.gen();
[INFO] [stderr]    |             ^^^^^^^ help: consider prefixing with an underscore: `_is_item`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.68s
[INFO] running `"docker" "inspect" "d352af591f30981682d815530140aa3daa3a9211c0b0e8755f0a7a57e9d31729"`
[INFO] running `"docker" "rm" "-f" "d352af591f30981682d815530140aa3daa3a9211c0b0e8755f0a7a57e9d31729"`
[INFO] [stdout] d352af591f30981682d815530140aa3daa3a9211c0b0e8755f0a7a57e9d31729
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/Nalleyer/rust_99_problem:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] d6a0c2a46361040978a977e48a530fc79d2a90286d0103428fffc387f03bfb33
[INFO] running `"docker" "start" "-a" "d6a0c2a46361040978a977e48a530fc79d2a90286d0103428fffc387f03bfb33"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_99_problem-a5a0bd9faefd57f2
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test solves::p7::tests::empty ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "d6a0c2a46361040978a977e48a530fc79d2a90286d0103428fffc387f03bfb33"`
[INFO] running `"docker" "rm" "-f" "d6a0c2a46361040978a977e48a530fc79d2a90286d0103428fffc387f03bfb33"`
[INFO] [stdout] d6a0c2a46361040978a977e48a530fc79d2a90286d0103428fffc387f03bfb33