[INFO] updating cached repository mkpankov/rusty_boy
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mkpankov/rusty_boy
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mkpankov/rusty_boy" "work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/mkpankov/rusty_boy"`
[INFO] [stderr] Cloning into 'work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/mkpankov/rusty_boy'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mkpankov/rusty_boy" "work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/mkpankov/rusty_boy"`
[INFO] [stderr] Cloning into 'work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/mkpankov/rusty_boy'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 304dbea8f56496636341e6d7b6a4a5bb3e9cf1f7
[INFO] sha for GitHub repo mkpankov/rusty_boy: 304dbea8f56496636341e6d7b6a4a5bb3e9cf1f7
[INFO] validating manifest of mkpankov/rusty_boy on toolchain master#39401465da4ce27aeeb2c2a26133ac35c63aa515
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mkpankov/rusty_boy on toolchain try#f45cc3094ee337acd688771b9234318046b0572d
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mkpankov/rusty_boy
[INFO] finished frobbing mkpankov/rusty_boy
[INFO] frobbed toml for mkpankov/rusty_boy written to work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/mkpankov/rusty_boy/Cargo.toml
[INFO] started frobbing mkpankov/rusty_boy
[INFO] finished frobbing mkpankov/rusty_boy
[INFO] frobbed toml for mkpankov/rusty_boy written to work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/mkpankov/rusty_boy/Cargo.toml
[INFO] crate mkpankov/rusty_boy already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/crater-raid/crater/work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/mkpankov/rusty_boy/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mkpankov/rusty_boy against master#39401465da4ce27aeeb2c2a26133ac35c63aa515 for pr-60914
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60914/worker-4/master#39401465da4ce27aeeb2c2a26133ac35c63aa515:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/mkpankov/rusty_boy:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 8479b3f9836876c1b01c5208da95e8faec540d7c9c027f889a1c7fe8cb9bf36f
[INFO] running `"docker" "start" "-a" "8479b3f9836876c1b01c5208da95e8faec540d7c9c027f889a1c7fe8cb9bf36f"`
[INFO] [stderr]     Checking bread v0.1.0
[INFO] [stderr]     Checking rusty_boy v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: the item `json` is imported redundantly
[INFO] [stderr]    --> src/main.rs:533:9
[INFO] [stderr]     |
[INFO] [stderr] 17  | use rustc_serialize::json;
[INFO] [stderr]     |     --------------------- the item `json` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 533 |     use rustc_serialize::json;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `json` is imported redundantly
[INFO] [stderr]    --> src/main.rs:533:9
[INFO] [stderr]     |
[INFO] [stderr] 17  | use rustc_serialize::json;
[INFO] [stderr]     |     --------------------- the item `json` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 533 |     use rustc_serialize::json;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:557:9
[INFO] [stderr]     |
[INFO] [stderr] 557 |     let mut stdin = std::io::stdin();
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:557:9
[INFO] [stderr]     |
[INFO] [stderr] 557 |     let mut stdin = std::io::stdin();
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.32s
[INFO] running `"docker" "inspect" "8479b3f9836876c1b01c5208da95e8faec540d7c9c027f889a1c7fe8cb9bf36f"`
[INFO] running `"docker" "rm" "-f" "8479b3f9836876c1b01c5208da95e8faec540d7c9c027f889a1c7fe8cb9bf36f"`
[INFO] [stdout] 8479b3f9836876c1b01c5208da95e8faec540d7c9c027f889a1c7fe8cb9bf36f