[INFO] updating cached repository BurntSushi/rust-error-handling-case-study
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/BurntSushi/rust-error-handling-case-study
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/BurntSushi/rust-error-handling-case-study" "work/ex/beta-1.38-1/sources/1.37.0/gh/BurntSushi/rust-error-handling-case-study"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/BurntSushi/rust-error-handling-case-study'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/BurntSushi/rust-error-handling-case-study" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/BurntSushi/rust-error-handling-case-study"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/BurntSushi/rust-error-handling-case-study'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8e2af66c6aa41387c578303253e6fac30b679d1d
[INFO] sha for GitHub repo BurntSushi/rust-error-handling-case-study: 8e2af66c6aa41387c578303253e6fac30b679d1d
[INFO] validating manifest of BurntSushi/rust-error-handling-case-study 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 BurntSushi/rust-error-handling-case-study 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 BurntSushi/rust-error-handling-case-study
[INFO] finished frobbing BurntSushi/rust-error-handling-case-study
[INFO] frobbed toml for BurntSushi/rust-error-handling-case-study written to work/ex/beta-1.38-1/sources/1.37.0/gh/BurntSushi/rust-error-handling-case-study/Cargo.toml
[INFO] started frobbing BurntSushi/rust-error-handling-case-study
[INFO] finished frobbing BurntSushi/rust-error-handling-case-study
[INFO] frobbed toml for BurntSushi/rust-error-handling-case-study written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/BurntSushi/rust-error-handling-case-study/Cargo.toml
[INFO] crate BurntSushi/rust-error-handling-case-study 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 BurntSushi/rust-error-handling-case-study 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/BurntSushi/rust-error-handling-case-study:/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] a818d0705241d53561a4c7d6fc1d25cbd0f07ca11d1b76d33fc690ba475aa566
[INFO] running `"docker" "start" "-a" "a818d0705241d53561a4c7d6fc1d25cbd0f07ca11d1b76d33fc690ba475aa566"`
[INFO] [stderr]    Compiling csv v0.14.7
[INFO] [stderr]    Compiling docopt v0.6.86
[INFO] [stderr]    Compiling city-pop v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:100:20
[INFO] [stderr]     |
[INFO] [stderr] 100 |     let input: Box<io::Read> = match *file_path {
[INFO] [stderr]     |                    ^^^^^^^^ help: use `dyn`: `dyn io::Read`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.85s
[INFO] running `"docker" "inspect" "a818d0705241d53561a4c7d6fc1d25cbd0f07ca11d1b76d33fc690ba475aa566"`
[INFO] running `"docker" "rm" "-f" "a818d0705241d53561a4c7d6fc1d25cbd0f07ca11d1b76d33fc690ba475aa566"`
[INFO] [stdout] a818d0705241d53561a4c7d6fc1d25cbd0f07ca11d1b76d33fc690ba475aa566
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/BurntSushi/rust-error-handling-case-study:/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] e6dcac2879c55d59f6b023e029ea0fdeb3209f6c6dc15674c741177e1b3c21ab
[INFO] running `"docker" "start" "-a" "e6dcac2879c55d59f6b023e029ea0fdeb3209f6c6dc15674c741177e1b3c21ab"`
[INFO] [stderr]    Compiling city-pop v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:100:20
[INFO] [stderr]     |
[INFO] [stderr] 100 |     let input: Box<io::Read> = match *file_path {
[INFO] [stderr]     |                    ^^^^^^^^ help: use `dyn`: `dyn io::Read`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `"docker" "inspect" "e6dcac2879c55d59f6b023e029ea0fdeb3209f6c6dc15674c741177e1b3c21ab"`
[INFO] running `"docker" "rm" "-f" "e6dcac2879c55d59f6b023e029ea0fdeb3209f6c6dc15674c741177e1b3c21ab"`
[INFO] [stdout] e6dcac2879c55d59f6b023e029ea0fdeb3209f6c6dc15674c741177e1b3c21ab
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/BurntSushi/rust-error-handling-case-study:/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] c03a5d631e1b2dec0876675f9d83ead9e15584f0500b46655ae0ab4e8c00bfbe
[INFO] running `"docker" "start" "-a" "c03a5d631e1b2dec0876675f9d83ead9e15584f0500b46655ae0ab4e8c00bfbe"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/city_pop-16479646928dde17
[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" "c03a5d631e1b2dec0876675f9d83ead9e15584f0500b46655ae0ab4e8c00bfbe"`
[INFO] running `"docker" "rm" "-f" "c03a5d631e1b2dec0876675f9d83ead9e15584f0500b46655ae0ab4e8c00bfbe"`
[INFO] [stdout] c03a5d631e1b2dec0876675f9d83ead9e15584f0500b46655ae0ab4e8c00bfbe