[INFO] updating cached repository sscdotopen/recoreco
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sscdotopen/recoreco
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sscdotopen/recoreco" "work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/sscdotopen/recoreco"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/sscdotopen/recoreco'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sscdotopen/recoreco" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/sscdotopen/recoreco"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/sscdotopen/recoreco'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d46fb314219a3039d53f2592f276e3751178e05e
[INFO] sha for GitHub repo sscdotopen/recoreco: d46fb314219a3039d53f2592f276e3751178e05e
[INFO] validating manifest of sscdotopen/recoreco on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of sscdotopen/recoreco on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing sscdotopen/recoreco
[INFO] finished frobbing sscdotopen/recoreco
[INFO] frobbed toml for sscdotopen/recoreco written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/sscdotopen/recoreco/Cargo.toml
[INFO] started frobbing sscdotopen/recoreco
[INFO] finished frobbing sscdotopen/recoreco
[INFO] frobbed toml for sscdotopen/recoreco written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/sscdotopen/recoreco/Cargo.toml
[INFO] crate sscdotopen/recoreco already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking sscdotopen/recoreco against master#e305df1846a6d985315917ae0c81b74af8b4e641 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-1/master#e305df1846a6d985315917ae0c81b74af8b4e641:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/sscdotopen/recoreco:/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" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 71ec9b92bde26bd933fa580ede44e228cefc09868a8bd7e0ad017c5debcca2e7
[INFO] running `"docker" "start" "-a" "71ec9b92bde26bd933fa580ede44e228cefc09868a8bd7e0ad017c5debcca2e7"`
[INFO] [stderr]    Compiling memchr v2.1.0
[INFO] [stderr]    Compiling syn v0.14.5
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking csv-core v0.1.4
[INFO] [stderr]     Checking rayon-core v1.4.1
[INFO] [stderr]     Checking csv v1.0.1
[INFO] [stderr]     Checking rayon v1.0.2
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]     Checking recoreco v0.1.9 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:184:17
[INFO] [stderr]     |
[INFO] [stderr] 184 |             let mut user_history = &mut samples_of_a[user_idx];
[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/lib.rs:184:17
[INFO] [stderr]     |
[INFO] [stderr] 184 |             let mut user_history = &mut samples_of_a[user_idx];
[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 25.00s
[INFO] running `"docker" "inspect" "71ec9b92bde26bd933fa580ede44e228cefc09868a8bd7e0ad017c5debcca2e7"`
[INFO] running `"docker" "rm" "-f" "71ec9b92bde26bd933fa580ede44e228cefc09868a8bd7e0ad017c5debcca2e7"`
[INFO] [stdout] 71ec9b92bde26bd933fa580ede44e228cefc09868a8bd7e0ad017c5debcca2e7