[INFO] updating cached repository alexeyden/rust-experiments
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/alexeyden/rust-experiments
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/alexeyden/rust-experiments" "work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/alexeyden/rust-experiments"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/alexeyden/rust-experiments'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/alexeyden/rust-experiments" "work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/alexeyden/rust-experiments"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/alexeyden/rust-experiments'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f01e50da7a04d7323f7e99a977cd536544231779
[INFO] sha for GitHub repo alexeyden/rust-experiments: f01e50da7a04d7323f7e99a977cd536544231779
[INFO] validating manifest of alexeyden/rust-experiments 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 alexeyden/rust-experiments 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 alexeyden/rust-experiments
[INFO] finished frobbing alexeyden/rust-experiments
[INFO] frobbed toml for alexeyden/rust-experiments written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/alexeyden/rust-experiments/Cargo.toml
[INFO] started frobbing alexeyden/rust-experiments
[INFO] finished frobbing alexeyden/rust-experiments
[INFO] frobbed toml for alexeyden/rust-experiments written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/alexeyden/rust-experiments/Cargo.toml
[INFO] crate alexeyden/rust-experiments 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 alexeyden/rust-experiments against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-5/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/alexeyden/rust-experiments:/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] c5bf2dc3668c787a34f22c8b3e2f4066a98341dad719b86375b8898e177aff8c
[INFO] running `"docker" "start" "-a" "c5bf2dc3668c787a34f22c8b3e2f4066a98341dad719b86375b8898e177aff8c"`
[INFO] [stderr]    Compiling sdl2-sys v0.27.2 (https://github.com/AngryLawyer/rust-sdl2#5d8c8632)
[INFO] [stderr]     Checking num-integer v0.1.33
[INFO] [stderr]     Checking serde_json v0.9.9
[INFO] [stderr]     Checking num-iter v0.1.33
[INFO] [stderr]     Checking num v0.1.37
[INFO] [stderr]     Checking sdl2 v0.29.0 (https://github.com/AngryLawyer/rust-sdl2#5d8c8632)
[INFO] [stderr]     Checking raster v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: the item `serde_json` is imported redundantly
[INFO] [stderr]   --> src/game.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     use serde_json;
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr]    | 
[INFO] [stderr]   ::: src/main.rs:2:1
[INFO] [stderr]    |
[INFO] [stderr] 2  | extern crate serde_json;
[INFO] [stderr]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `serde_json` is imported redundantly
[INFO] [stderr]   --> src/game.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     use serde_json;
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr]    | 
[INFO] [stderr]   ::: src/main.rs:2:1
[INFO] [stderr]    |
[INFO] [stderr] 2  | extern crate serde_json;
[INFO] [stderr]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.08s
[INFO] running `"docker" "inspect" "c5bf2dc3668c787a34f22c8b3e2f4066a98341dad719b86375b8898e177aff8c"`
[INFO] running `"docker" "rm" "-f" "c5bf2dc3668c787a34f22c8b3e2f4066a98341dad719b86375b8898e177aff8c"`
[INFO] [stdout] c5bf2dc3668c787a34f22c8b3e2f4066a98341dad719b86375b8898e177aff8c