[INFO] updating cached repository mike706574/rust-json-file-deserialization-example
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mike706574/rust-json-file-deserialization-example
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mike706574/rust-json-file-deserialization-example" "work/ex/beta-1.37-6/sources/1.36.0/gh/mike706574/rust-json-file-deserialization-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/mike706574/rust-json-file-deserialization-example'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mike706574/rust-json-file-deserialization-example" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mike706574/rust-json-file-deserialization-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mike706574/rust-json-file-deserialization-example'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f08a1321a61340d0398afa26434423e395575c11
[INFO] sha for GitHub repo mike706574/rust-json-file-deserialization-example: f08a1321a61340d0398afa26434423e395575c11
[INFO] validating manifest of mike706574/rust-json-file-deserialization-example 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 mike706574/rust-json-file-deserialization-example 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 mike706574/rust-json-file-deserialization-example
[INFO] finished frobbing mike706574/rust-json-file-deserialization-example
[INFO] frobbed toml for mike706574/rust-json-file-deserialization-example written to work/ex/beta-1.37-6/sources/1.36.0/gh/mike706574/rust-json-file-deserialization-example/Cargo.toml
[INFO] started frobbing mike706574/rust-json-file-deserialization-example
[INFO] finished frobbing mike706574/rust-json-file-deserialization-example
[INFO] frobbed toml for mike706574/rust-json-file-deserialization-example written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mike706574/rust-json-file-deserialization-example/Cargo.toml
[INFO] crate mike706574/rust-json-file-deserialization-example 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mike706574/rust-json-file-deserialization-example against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mike706574/rust-json-file-deserialization-example:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] e49ddd895b6f866ba64176d609ae6d53954910a46ba0b81e980d4599ff17c44f
[INFO] running `"docker" "start" "-a" "e49ddd895b6f866ba64176d609ae6d53954910a46ba0b81e980d4599ff17c44f"`
[INFO] [stderr]    Compiling serde v1.0.10
[INFO] [stderr]    Compiling serde_derive v1.0.10
[INFO] [stderr]    Compiling serde_json v1.0.2
[INFO] [stderr]    Compiling foo v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     example();
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.86s
[INFO] running `"docker" "inspect" "e49ddd895b6f866ba64176d609ae6d53954910a46ba0b81e980d4599ff17c44f"`
[INFO] running `"docker" "rm" "-f" "e49ddd895b6f866ba64176d609ae6d53954910a46ba0b81e980d4599ff17c44f"`
[INFO] [stdout] e49ddd895b6f866ba64176d609ae6d53954910a46ba0b81e980d4599ff17c44f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mike706574/rust-json-file-deserialization-example:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 302fb263b29195ce80a0987d42123539696f75d1acd86f64c0b50dd75cee515f
[INFO] running `"docker" "start" "-a" "302fb263b29195ce80a0987d42123539696f75d1acd86f64c0b50dd75cee515f"`
[INFO] [stderr]    Compiling foo v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     example();
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `"docker" "inspect" "302fb263b29195ce80a0987d42123539696f75d1acd86f64c0b50dd75cee515f"`
[INFO] running `"docker" "rm" "-f" "302fb263b29195ce80a0987d42123539696f75d1acd86f64c0b50dd75cee515f"`
[INFO] [stdout] 302fb263b29195ce80a0987d42123539696f75d1acd86f64c0b50dd75cee515f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mike706574/rust-json-file-deserialization-example:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 76b00196dec529fd08d8fe14e5d1a3ce40031b546ab6efe4a65ba033805d390a
[INFO] running `"docker" "start" "-a" "76b00196dec529fd08d8fe14e5d1a3ce40031b546ab6efe4a65ba033805d390a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/foo-2f68f94058f159e4
[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" "76b00196dec529fd08d8fe14e5d1a3ce40031b546ab6efe4a65ba033805d390a"`
[INFO] running `"docker" "rm" "-f" "76b00196dec529fd08d8fe14e5d1a3ce40031b546ab6efe4a65ba033805d390a"`
[INFO] [stdout] 76b00196dec529fd08d8fe14e5d1a3ce40031b546ab6efe4a65ba033805d390a