[INFO] updating cached repository regexident/cargo-modules
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/regexident/cargo-modules
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/regexident/cargo-modules" "work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/regexident/cargo-modules"`
[INFO] [stderr] Cloning into 'work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/regexident/cargo-modules'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/regexident/cargo-modules" "work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/regexident/cargo-modules"`
[INFO] [stderr] Cloning into 'work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/regexident/cargo-modules'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c60ed57910a3d005f7e88827d7ce3206d4a831dd
[INFO] sha for GitHub repo regexident/cargo-modules: c60ed57910a3d005f7e88827d7ce3206d4a831dd
[INFO] validating manifest of regexident/cargo-modules 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 regexident/cargo-modules 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 regexident/cargo-modules
[INFO] finished frobbing regexident/cargo-modules
[INFO] frobbed toml for regexident/cargo-modules written to work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/regexident/cargo-modules/Cargo.toml
[INFO] started frobbing regexident/cargo-modules
[INFO] finished frobbing regexident/cargo-modules
[INFO] frobbed toml for regexident/cargo-modules written to work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/regexident/cargo-modules/Cargo.toml
[INFO] crate regexident/cargo-modules 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] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking regexident/cargo-modules against try#f45cc3094ee337acd688771b9234318046b0572d for pr-60914
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60914/worker-0/try#f45cc3094ee337acd688771b9234318046b0572d:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/regexident/cargo-modules:/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" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 35f3e8c6194f8401a8a7c65f87771c67750e1f621e5bb2fd5acf261da9658f33
[INFO] running `"docker" "start" "-a" "35f3e8c6194f8401a8a7c65f87771c67750e1f621e5bb2fd5acf261da9658f33"`
[INFO] [stderr]    Compiling rustc-rayon-core v0.1.1
[INFO] [stderr]     Checking rustc-ap-graphviz v373.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_target v373.0.0
[INFO] [stderr]     Checking scoped-tls v0.1.2
[INFO] [stderr]    Compiling rustc-ap-syntax v373.0.0
[INFO] [stderr]     Checking rustc-ap-rustc_cratesio_shim v373.0.0
[INFO] [stderr]     Checking ena v0.11.0
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]     Checking smallvec v0.6.7
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[INFO] [stderr]     Checking rustc-ap-serialize v373.0.0
[INFO] [stderr]     Checking rustc-rayon v0.1.1
[INFO] [stderr]     Checking parking_lot v0.6.4
[INFO] [stderr]     Checking structopt v0.2.14
[INFO] [stderr]     Checking rustc-ap-rustc_data_structures v373.0.0
[INFO] [stderr]     Checking rustc-ap-arena v373.0.0
[INFO] [stderr]     Checking rustc-ap-syntax_pos v373.0.0
[INFO] [stderr]     Checking rustc-ap-rustc_errors v373.0.0
[INFO] [stderr]     Checking cargo-modules v0.4.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/builder.rs:184:17
[INFO] [stderr]     |
[INFO] [stderr] 184 |             let mut prefix = if use_tree.prefix.segments.is_empty() {
[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/builder.rs:184:17
[INFO] [stderr]     |
[INFO] [stderr] 184 |             let mut prefix = if use_tree.prefix.segments.is_empty() {
[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 34.99s
[INFO] running `"docker" "inspect" "35f3e8c6194f8401a8a7c65f87771c67750e1f621e5bb2fd5acf261da9658f33"`
[INFO] running `"docker" "rm" "-f" "35f3e8c6194f8401a8a7c65f87771c67750e1f621e5bb2fd5acf261da9658f33"`
[INFO] [stdout] 35f3e8c6194f8401a8a7c65f87771c67750e1f621e5bb2fd5acf261da9658f33