[INFO] crate immutable 0.1.1 is already in cache
[INFO] extracting crate immutable 0.1.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/immutable/0.1.1
[INFO] extracting crate immutable 0.1.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/immutable/0.1.1
[INFO] validating manifest of immutable-0.1.1 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 immutable-0.1.1 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 immutable-0.1.1
[INFO] finished frobbing immutable-0.1.1
[INFO] frobbed toml for immutable-0.1.1 written to work/ex/beta-1.37-6/sources/1.36.0/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-1.37-6/sources/beta-2019-07-23/reg/immutable/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing immutable-0.1.1 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-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 334f7a1f5ae2d2c49aea6cabcfa9dcf380cb18dfb114c215c5fe1863d5ea21f0
[INFO] running `"docker" "start" "-a" "334f7a1f5ae2d2c49aea6cabcfa9dcf380cb18dfb114c215c5fe1863d5ea21f0"`
[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 0.66s
[INFO] running `"docker" "inspect" "334f7a1f5ae2d2c49aea6cabcfa9dcf380cb18dfb114c215c5fe1863d5ea21f0"`
[INFO] running `"docker" "rm" "-f" "334f7a1f5ae2d2c49aea6cabcfa9dcf380cb18dfb114c215c5fe1863d5ea21f0"`
[INFO] [stdout] 334f7a1f5ae2d2c49aea6cabcfa9dcf380cb18dfb114c215c5fe1863d5ea21f0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 67c640e3aec93b49fa57641ca24abdbbbb9f46fad666b68d706b3a711d006d1d
[INFO] running `"docker" "start" "-a" "67c640e3aec93b49fa57641ca24abdbbbb9f46fad666b68d706b3a711d006d1d"`
[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 1.38s
[INFO] running `"docker" "inspect" "67c640e3aec93b49fa57641ca24abdbbbb9f46fad666b68d706b3a711d006d1d"`
[INFO] running `"docker" "rm" "-f" "67c640e3aec93b49fa57641ca24abdbbbb9f46fad666b68d706b3a711d006d1d"`
[INFO] [stdout] 67c640e3aec93b49fa57641ca24abdbbbb9f46fad666b68d706b3a711d006d1d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 4017594f190cc643d9d8d9d3bcb38f937c378e250a915a745ebd1e1fc910967e
[INFO] running `"docker" "start" "-a" "4017594f190cc643d9d8d9d3bcb38f937c378e250a915a745ebd1e1fc910967e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/immutable-27afb7ef00fd7332
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stdout] test list::list_head ... ok
[INFO] [stdout] test list::list_iterator ... ok
[INFO] [stdout] test tree::binary_tree::tree_balance ... ok
[INFO] [stdout] test tree::binary_tree::test_height ... ok
[INFO] [stdout] test list::list_tail ... ok
[INFO] [stdout] test map::map_macro ... ok
[INFO] [stdout] test tree::binary_tree::tree_macro ... ok
[INFO] [stdout] test list::list_macro ... ok
[INFO] [stdout] test tree::binary_tree::tree_iter ... 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" "4017594f190cc643d9d8d9d3bcb38f937c378e250a915a745ebd1e1fc910967e"`
[INFO] running `"docker" "rm" "-f" "4017594f190cc643d9d8d9d3bcb38f937c378e250a915a745ebd1e1fc910967e"`
[INFO] [stdout] 4017594f190cc643d9d8d9d3bcb38f937c378e250a915a745ebd1e1fc910967e