[INFO] updating cached repository thorntonmc/lson
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/thorntonmc/lson
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/thorntonmc/lson" "work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/thorntonmc/lson"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/thorntonmc/lson'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/thorntonmc/lson" "work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/thorntonmc/lson"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/thorntonmc/lson'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 726776dd3098c01589643f0be46e101fda0b022f
[INFO] sha for GitHub repo thorntonmc/lson: 726776dd3098c01589643f0be46e101fda0b022f
[INFO] validating manifest of thorntonmc/lson on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of thorntonmc/lson on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing thorntonmc/lson
[INFO] finished frobbing thorntonmc/lson
[INFO] frobbed toml for thorntonmc/lson written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/thorntonmc/lson/Cargo.toml
[INFO] started frobbing thorntonmc/lson
[INFO] finished frobbing thorntonmc/lson
[INFO] frobbed toml for thorntonmc/lson written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/thorntonmc/lson/Cargo.toml
[INFO] crate thorntonmc/lson already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking thorntonmc/lson against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-0/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/thorntonmc/lson:/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=forbid" "-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" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 12f22ffde5be1b21c3d4fa70a0ee0bea2007d6452ee63ef794f990b42547d631
[INFO] running `"docker" "start" "-a" "12f22ffde5be1b21c3d4fa70a0ee0bea2007d6452ee63ef794f990b42547d631"`
[INFO] [stderr]    Compiling syn v0.15.38
[INFO] [stderr]    Compiling serde_derive v1.0.94
[INFO] [stderr]    Compiling structopt-derive v0.2.16
[INFO] [stderr]     Checking structopt v0.2.16
[INFO] [stderr]     Checking serde v1.0.94
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking lson v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: field is never used: `contents`
[INFO] [stderr]   --> src/main.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     contents: Option<Box<BinaryFile>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `contents`
[INFO] [stderr]   --> src/main.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     contents: Option<Box<BinaryFile>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 44.42s
[INFO] running `"docker" "inspect" "12f22ffde5be1b21c3d4fa70a0ee0bea2007d6452ee63ef794f990b42547d631"`
[INFO] running `"docker" "rm" "-f" "12f22ffde5be1b21c3d4fa70a0ee0bea2007d6452ee63ef794f990b42547d631"`
[INFO] [stdout] 12f22ffde5be1b21c3d4fa70a0ee0bea2007d6452ee63ef794f990b42547d631