[INFO] crate immutable 0.1.1 is already in cache
[INFO] extracting crate immutable 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/immutable/0.1.1
[INFO] extracting crate immutable 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/immutable/0.1.1
[INFO] validating manifest of immutable-0.1.1 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 immutable-0.1.1 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 immutable-0.1.1
[INFO] finished frobbing immutable-0.1.1
[INFO] frobbed toml for immutable-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/immutable/0.1.1/Cargo.toml
[INFO] started frobbing immutable-0.1.1
[INFO] finished frobbing immutable-0.1.1
[INFO] frobbed toml for immutable-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/immutable/0.1.1/Cargo.toml
[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] 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 immutable-0.1.1 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-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/immutable/0.1.1:/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] efcd16f4372f8ec7cf1bf4723c2ff5229a1deeb7ee0682ed5f83f770371c87df
[INFO] running `"docker" "start" "-a" "efcd16f4372f8ec7cf1bf4723c2ff5229a1deeb7ee0682ed5f83f770371c87df"`
[INFO] [stderr]    Compiling immutable v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::vec::IntoIter`
[INFO] [stderr]  --> src/list.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::vec::IntoIter;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]  --> src/list.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | #[macro_escape]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_attributes)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]   --> src/tree/binary_tree.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[macro_escape]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `"docker" "inspect" "efcd16f4372f8ec7cf1bf4723c2ff5229a1deeb7ee0682ed5f83f770371c87df"`
[INFO] running `"docker" "rm" "-f" "efcd16f4372f8ec7cf1bf4723c2ff5229a1deeb7ee0682ed5f83f770371c87df"`
[INFO] [stdout] efcd16f4372f8ec7cf1bf4723c2ff5229a1deeb7ee0682ed5f83f770371c87df
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/immutable/0.1.1:/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] 11345a3bd57ecd35386bd560b93b5b9903127646f069bf2cfd4f48bb0a9c8b45
[INFO] running `"docker" "start" "-a" "11345a3bd57ecd35386bd560b93b5b9903127646f069bf2cfd4f48bb0a9c8b45"`
[INFO] [stderr]    Compiling immutable v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::vec::IntoIter`
[INFO] [stderr]  --> src/list.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::vec::IntoIter;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]  --> src/list.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | #[macro_escape]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_attributes)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]   --> src/tree/binary_tree.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[macro_escape]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.45s
[INFO] running `"docker" "inspect" "11345a3bd57ecd35386bd560b93b5b9903127646f069bf2cfd4f48bb0a9c8b45"`
[INFO] running `"docker" "rm" "-f" "11345a3bd57ecd35386bd560b93b5b9903127646f069bf2cfd4f48bb0a9c8b45"`
[INFO] [stdout] 11345a3bd57ecd35386bd560b93b5b9903127646f069bf2cfd4f48bb0a9c8b45
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/immutable/0.1.1:/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] 2451d84a64f2ad6b278a26d66907570142a6837f83aec6babaeab60ba533d835
[INFO] running `"docker" "start" "-a" "2451d84a64f2ad6b278a26d66907570142a6837f83aec6babaeab60ba533d835"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/immutable-e1fb8fd5443ba800
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stdout] test tree::binary_tree::test_height ... ok
[INFO] [stdout] test tree::binary_tree::tree_balance ... ok
[INFO] [stdout] test map::map_macro ... ok
[INFO] [stdout] test list::list_tail ... ok
[INFO] [stdout] test list::list_macro ... ok
[INFO] [stdout] test tree::binary_tree::tree_iter ... ok
[INFO] [stdout] test list::list_iterator ... ok
[INFO] [stdout] test tree::binary_tree::tree_macro ... ok
[INFO] [stdout] test list::list_head ... ok
[INFO] [stdout] test list::list_append ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests immutable
[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" "2451d84a64f2ad6b278a26d66907570142a6837f83aec6babaeab60ba533d835"`
[INFO] running `"docker" "rm" "-f" "2451d84a64f2ad6b278a26d66907570142a6837f83aec6babaeab60ba533d835"`
[INFO] [stdout] 2451d84a64f2ad6b278a26d66907570142a6837f83aec6babaeab60ba533d835