[INFO] updating cached repository UnHumbleBen/rust-iterators
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/UnHumbleBen/rust-iterators
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/UnHumbleBen/rust-iterators" "work/ex/beta-1.38-1/sources/1.37.0/gh/UnHumbleBen/rust-iterators"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/UnHumbleBen/rust-iterators'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/UnHumbleBen/rust-iterators" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/UnHumbleBen/rust-iterators"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/UnHumbleBen/rust-iterators'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3cf3a23bd75c89aa207dcfad058f12cdf89fac29
[INFO] sha for GitHub repo UnHumbleBen/rust-iterators: 3cf3a23bd75c89aa207dcfad058f12cdf89fac29
[INFO] validating manifest of UnHumbleBen/rust-iterators 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 UnHumbleBen/rust-iterators 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 UnHumbleBen/rust-iterators
[INFO] finished frobbing UnHumbleBen/rust-iterators
[INFO] frobbed toml for UnHumbleBen/rust-iterators written to work/ex/beta-1.38-1/sources/1.37.0/gh/UnHumbleBen/rust-iterators/Cargo.toml
[INFO] started frobbing UnHumbleBen/rust-iterators
[INFO] finished frobbing UnHumbleBen/rust-iterators
[INFO] frobbed toml for UnHumbleBen/rust-iterators written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/UnHumbleBen/rust-iterators/Cargo.toml
[INFO] crate UnHumbleBen/rust-iterators 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 UnHumbleBen/rust-iterators 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/UnHumbleBen/rust-iterators:/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] 7ddcd598d4c2eded9bf6f947ec5e76a64838f0eb2be1d8c07af0122aaf3ed75d
[INFO] running `"docker" "start" "-a" "7ddcd598d4c2eded9bf6f947ec5e76a64838f0eb2be1d8c07af0122aaf3ed75d"`
[INFO] [stderr]    Compiling iterator v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `shoes_in_my_size`
[INFO] [stderr]   --> src/lib.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Counter`
[INFO] [stderr]   --> src/lib.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | struct Counter {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/lib.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn new() -> Counter {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.68s
[INFO] running `"docker" "inspect" "7ddcd598d4c2eded9bf6f947ec5e76a64838f0eb2be1d8c07af0122aaf3ed75d"`
[INFO] running `"docker" "rm" "-f" "7ddcd598d4c2eded9bf6f947ec5e76a64838f0eb2be1d8c07af0122aaf3ed75d"`
[INFO] [stdout] 7ddcd598d4c2eded9bf6f947ec5e76a64838f0eb2be1d8c07af0122aaf3ed75d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/UnHumbleBen/rust-iterators:/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] db8c9d8cc71720b911df6d61146a9c85ebbfc0f050c221e1608ad710a790d9b4
[INFO] running `"docker" "start" "-a" "db8c9d8cc71720b911df6d61146a9c85ebbfc0f050c221e1608ad710a790d9b4"`
[INFO] [stderr]    Compiling iterator v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `"docker" "inspect" "db8c9d8cc71720b911df6d61146a9c85ebbfc0f050c221e1608ad710a790d9b4"`
[INFO] running `"docker" "rm" "-f" "db8c9d8cc71720b911df6d61146a9c85ebbfc0f050c221e1608ad710a790d9b4"`
[INFO] [stdout] db8c9d8cc71720b911df6d61146a9c85ebbfc0f050c221e1608ad710a790d9b4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/UnHumbleBen/rust-iterators:/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] f51cfe03b56391d6613dc888dc32a306a19bfa046f610af9499bd4aa7895bb9d
[INFO] running `"docker" "start" "-a" "f51cfe03b56391d6613dc888dc32a306a19bfa046f610af9499bd4aa7895bb9d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/iterator-8ba000b46eef7b50
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test calling_next_directly ... ok
[INFO] [stdout] test iterator_demonstration ... ok
[INFO] [stdout] test filters_by_size ... ok
[INFO] [stdout] test iterator_sum ... ok
[INFO] [stdout] test using_other_iterator_trait_methods ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/iterator-35e834255421be41
[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] [stderr]    Doc-tests iterator
[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" "f51cfe03b56391d6613dc888dc32a306a19bfa046f610af9499bd4aa7895bb9d"`
[INFO] running `"docker" "rm" "-f" "f51cfe03b56391d6613dc888dc32a306a19bfa046f610af9499bd4aa7895bb9d"`
[INFO] [stdout] f51cfe03b56391d6613dc888dc32a306a19bfa046f610af9499bd4aa7895bb9d