[INFO] updating cached repository IanWhitney/rusty_twins
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/IanWhitney/rusty_twins
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/IanWhitney/rusty_twins" "work/ex/beta-1.37-6/sources/1.36.0/gh/IanWhitney/rusty_twins"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/IanWhitney/rusty_twins'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/IanWhitney/rusty_twins" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/IanWhitney/rusty_twins"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/IanWhitney/rusty_twins'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d715a848839745ee8b56274b90a5c878d74680d4
[INFO] sha for GitHub repo IanWhitney/rusty_twins: d715a848839745ee8b56274b90a5c878d74680d4
[INFO] validating manifest of IanWhitney/rusty_twins 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 IanWhitney/rusty_twins 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 IanWhitney/rusty_twins
[INFO] finished frobbing IanWhitney/rusty_twins
[INFO] frobbed toml for IanWhitney/rusty_twins written to work/ex/beta-1.37-6/sources/1.36.0/gh/IanWhitney/rusty_twins/Cargo.toml
[INFO] started frobbing IanWhitney/rusty_twins
[INFO] finished frobbing IanWhitney/rusty_twins
[INFO] frobbed toml for IanWhitney/rusty_twins written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/IanWhitney/rusty_twins/Cargo.toml
[INFO] crate IanWhitney/rusty_twins 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/IanWhitney/rusty_twins/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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 IanWhitney/rusty_twins 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-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/IanWhitney/rusty_twins:/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] 5c8be89f56505367c5242cad678ce61e08a588fcf52dddeea5887d91f49bc567
[INFO] running `"docker" "start" "-a" "5c8be89f56505367c5242cad678ce61e08a588fcf52dddeea5887d91f49bc567"`
[INFO] [stderr]    Compiling getopts v0.2.19
[INFO] [stderr]    Compiling csv v0.14.7
[INFO] [stderr]    Compiling rusty_twins v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rustc_serialize::Decodable`
[INFO] [stderr]  --> src/game.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rustc_serialize::Decodable;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |             wtr.write(vec!["id", "opponent", "date", "attendee_id"].into_iter());
[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] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     fs::copy("./data/ngames.csv", "./data/games.csv");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     fs::remove_file("./data/ngames.csv");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[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 4.99s
[INFO] running `"docker" "inspect" "5c8be89f56505367c5242cad678ce61e08a588fcf52dddeea5887d91f49bc567"`
[INFO] running `"docker" "rm" "-f" "5c8be89f56505367c5242cad678ce61e08a588fcf52dddeea5887d91f49bc567"`
[INFO] [stdout] 5c8be89f56505367c5242cad678ce61e08a588fcf52dddeea5887d91f49bc567
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/IanWhitney/rusty_twins:/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] 5b8a9690185c2cabd6b2987b6bce0e7a9978e73ad2708de5a6822cce0e8b96b0
[INFO] running `"docker" "start" "-a" "5b8a9690185c2cabd6b2987b6bce0e7a9978e73ad2708de5a6822cce0e8b96b0"`
[INFO] [stderr]    Compiling rusty_twins v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rustc_serialize::Decodable`
[INFO] [stderr]  --> src/game.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rustc_serialize::Decodable;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |             wtr.write(vec!["id", "opponent", "date", "attendee_id"].into_iter());
[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] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     fs::copy("./data/ngames.csv", "./data/games.csv");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:90:5
[INFO] [stderr]    |
[INFO] [stderr] 90 |     fs::remove_file("./data/ngames.csv");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[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 0.72s
[INFO] running `"docker" "inspect" "5b8a9690185c2cabd6b2987b6bce0e7a9978e73ad2708de5a6822cce0e8b96b0"`
[INFO] running `"docker" "rm" "-f" "5b8a9690185c2cabd6b2987b6bce0e7a9978e73ad2708de5a6822cce0e8b96b0"`
[INFO] [stdout] 5b8a9690185c2cabd6b2987b6bce0e7a9978e73ad2708de5a6822cce0e8b96b0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/IanWhitney/rusty_twins:/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] 682587c50c8b21e1ed74e736731369b59f1fb43e3795a556590c2ba1f74724a9
[INFO] running `"docker" "start" "-a" "682587c50c8b21e1ed74e736731369b59f1fb43e3795a556590c2ba1f74724a9"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rusty_twins-952deebae9f3cc39
[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" "682587c50c8b21e1ed74e736731369b59f1fb43e3795a556590c2ba1f74724a9"`
[INFO] running `"docker" "rm" "-f" "682587c50c8b21e1ed74e736731369b59f1fb43e3795a556590c2ba1f74724a9"`
[INFO] [stdout] 682587c50c8b21e1ed74e736731369b59f1fb43e3795a556590c2ba1f74724a9