[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-1.38-1/sources/1.37.0/gh/mike706574/rust-json-file-deserialization-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/gh/mike706574/rust-json-file-deserialization-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mike706574/rust-json-file-deserialization-example 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 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-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 mike706574/rust-json-file-deserialization-example 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-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 0e48634765c5bcbaaa3429397cd5c9eab2c92ae5ac27d7a37d3d097c67b37c4b
[INFO] running `"docker" "start" "-a" "0e48634765c5bcbaaa3429397cd5c9eab2c92ae5ac27d7a37d3d097c67b37c4b"`
[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 4.41s
[INFO] running `"docker" "inspect" "0e48634765c5bcbaaa3429397cd5c9eab2c92ae5ac27d7a37d3d097c67b37c4b"`
[INFO] running `"docker" "rm" "-f" "0e48634765c5bcbaaa3429397cd5c9eab2c92ae5ac27d7a37d3d097c67b37c4b"`
[INFO] [stdout] 0e48634765c5bcbaaa3429397cd5c9eab2c92ae5ac27d7a37d3d097c67b37c4b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] e8f550a6c1658c071f0bf5e27c124bbafd732edb0b52eceb4d1431c10a783c7f
[INFO] running `"docker" "start" "-a" "e8f550a6c1658c071f0bf5e27c124bbafd732edb0b52eceb4d1431c10a783c7f"`
[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 0.80s
[INFO] running `"docker" "inspect" "e8f550a6c1658c071f0bf5e27c124bbafd732edb0b52eceb4d1431c10a783c7f"`
[INFO] running `"docker" "rm" "-f" "e8f550a6c1658c071f0bf5e27c124bbafd732edb0b52eceb4d1431c10a783c7f"`
[INFO] [stdout] e8f550a6c1658c071f0bf5e27c124bbafd732edb0b52eceb4d1431c10a783c7f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 077f0b0c7418a5b1826df1d0286414b5ab32869169ab60922553005ba7b30438
[INFO] running `"docker" "start" "-a" "077f0b0c7418a5b1826df1d0286414b5ab32869169ab60922553005ba7b30438"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/foo-c9198b8a6e317e00
[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" "077f0b0c7418a5b1826df1d0286414b5ab32869169ab60922553005ba7b30438"`
[INFO] running `"docker" "rm" "-f" "077f0b0c7418a5b1826df1d0286414b5ab32869169ab60922553005ba7b30438"`
[INFO] [stdout] 077f0b0c7418a5b1826df1d0286414b5ab32869169ab60922553005ba7b30438