[INFO] updating cached repository torkeldanielsson/fraction_problems_generator
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/torkeldanielsson/fraction_problems_generator
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/torkeldanielsson/fraction_problems_generator" "work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/torkeldanielsson/fraction_problems_generator"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/torkeldanielsson/fraction_problems_generator'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/torkeldanielsson/fraction_problems_generator" "work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/torkeldanielsson/fraction_problems_generator"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/torkeldanielsson/fraction_problems_generator'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4de0983a740f35130066c9eafd39386d82348861
[INFO] sha for GitHub repo torkeldanielsson/fraction_problems_generator: 4de0983a740f35130066c9eafd39386d82348861
[INFO] validating manifest of torkeldanielsson/fraction_problems_generator on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of torkeldanielsson/fraction_problems_generator on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing torkeldanielsson/fraction_problems_generator
[INFO] finished frobbing torkeldanielsson/fraction_problems_generator
[INFO] frobbed toml for torkeldanielsson/fraction_problems_generator written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/torkeldanielsson/fraction_problems_generator/Cargo.toml
[INFO] started frobbing torkeldanielsson/fraction_problems_generator
[INFO] finished frobbing torkeldanielsson/fraction_problems_generator
[INFO] frobbed toml for torkeldanielsson/fraction_problems_generator written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/torkeldanielsson/fraction_problems_generator/Cargo.toml
[INFO] crate torkeldanielsson/fraction_problems_generator already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking torkeldanielsson/fraction_problems_generator against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-6/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/torkeldanielsson/fraction_problems_generator:/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" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] e7a671ba77e124eb3105efd86885b421609d123bde2dd30106bdc2e2e5d6493a
[INFO] running `"docker" "start" "-a" "e7a671ba77e124eb3105efd86885b421609d123bde2dd30106bdc2e2e5d6493a"`
[INFO] [stderr]     Checking math_gen v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:225:13
[INFO] [stderr]     |
[INFO] [stderr] 225 |         let mut a: i32 = rand::distributions::Range::new(3, 10).ind_sample(&mut rng);
[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:225:13
[INFO] [stderr]     |
[INFO] [stderr] 225 |         let mut a: i32 = rand::distributions::Range::new(3, 10).ind_sample(&mut rng);
[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 2.05s
[INFO] running `"docker" "inspect" "e7a671ba77e124eb3105efd86885b421609d123bde2dd30106bdc2e2e5d6493a"`
[INFO] running `"docker" "rm" "-f" "e7a671ba77e124eb3105efd86885b421609d123bde2dd30106bdc2e2e5d6493a"`
[INFO] [stdout] e7a671ba77e124eb3105efd86885b421609d123bde2dd30106bdc2e2e5d6493a