[INFO] updating cached repository SpamapS/rubble
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/SpamapS/rubble
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/SpamapS/rubble" "work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/SpamapS/rubble"`
[INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/SpamapS/rubble'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/SpamapS/rubble" "work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/SpamapS/rubble"`
[INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/SpamapS/rubble'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 25fde6a1a3bf684dad7f34a792701ca0c3afbcf0
[INFO] sha for GitHub repo SpamapS/rubble: 25fde6a1a3bf684dad7f34a792701ca0c3afbcf0
[INFO] validating manifest of SpamapS/rubble on toolchain master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of SpamapS/rubble on toolchain try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing SpamapS/rubble
[INFO] finished frobbing SpamapS/rubble
[INFO] frobbed toml for SpamapS/rubble written to work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/SpamapS/rubble/Cargo.toml
[INFO] started frobbing SpamapS/rubble
[INFO] finished frobbing SpamapS/rubble
[INFO] frobbed toml for SpamapS/rubble written to work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/SpamapS/rubble/Cargo.toml
[INFO] crate SpamapS/rubble already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on the registry index
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking SpamapS/rubble against try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b for pr-59199
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-59199/worker-1/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/SpamapS/rubble:/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" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 88168d7b5138b28eeb22b4ac5d11933c8b63d282777005d703cd7c86bf0be4be
[INFO] running `"docker" "start" "-a" "88168d7b5138b28eeb22b4ac5d11933c8b63d282777005d703cd7c86bf0be4be"`
[INFO] [stderr]     Checking syscall v0.2.1
[INFO] [stderr]     Checking isatty v0.1.3
[INFO] [stderr]     Checking nix v0.8.0
[INFO] [stderr]     Checking thread_local v0.3.3
[INFO] [stderr]     Checking error-chain v0.8.1
[INFO] [stderr]     Checking regex v0.2.1
[INFO] [stderr]     Checking caps v0.0.1
[INFO] [stderr]     Checking env_logger v0.4.2
[INFO] [stderr]     Checking rubble v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `CLONE_NEWIPC`
[INFO] [stderr]   --> src/main.rs:24:73
[INFO] [stderr]    |
[INFO] [stderr] 24 |                 CLONE_NEWNS, CLONE_NEWUSER, CLONE_NEWPID, CLONE_NEWNET, CLONE_NEWIPC, CLONE_NEWUTS,
[INFO] [stderr]    |                                                                         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `CLONE_NEWIPC`
[INFO] [stderr]   --> src/main.rs:24:73
[INFO] [stderr]    |
[INFO] [stderr] 24 |                 CLONE_NEWNS, CLONE_NEWUSER, CLONE_NEWPID, CLONE_NEWNET, CLONE_NEWIPC, CLONE_NEWUTS,
[INFO] [stderr]    |                                                                         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `real_gid`
[INFO] [stderr]   --> src/main.rs:54:35
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn acquire_privs(real_uid: uid_t, real_gid: uid_t) -> bool {
[INFO] [stderr]    |                                   ^^^^^^^^ help: consider prefixing with an underscore: `_real_gid`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `overflow_uid`
[INFO] [stderr]    --> src/main.rs:341:10
[INFO] [stderr]     |
[INFO] [stderr] 341 |     let (overflow_uid, overflow_gid) = read_overflowids();
[INFO] [stderr]     |          ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_overflow_uid`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `overflow_gid`
[INFO] [stderr]    --> src/main.rs:341:24
[INFO] [stderr]     |
[INFO] [stderr] 341 |     let (overflow_uid, overflow_gid) = read_overflowids();
[INFO] [stderr]     |                        ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_overflow_gid`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `host_tty_dev` is assigned to, but never used
[INFO] [stderr]    --> src/main.rs:343:13
[INFO] [stderr]     |
[INFO] [stderr] 343 |     let mut host_tty_dev: Option<String> = None;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_host_tty_dev` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `host_tty_dev` is never read
[INFO] [stderr]    --> src/main.rs:345:9
[INFO] [stderr]     |
[INFO] [stderr] 345 |         host_tty_dev = Some(unsafe {
[INFO] [stderr]     |         ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `opt_sandbox_uid`
[INFO] [stderr]    --> src/main.rs:421:9
[INFO] [stderr]     |
[INFO] [stderr] 421 |     let opt_sandbox_uid = match popts.sandbox_uid {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_opt_sandbox_uid`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `opt_sandbox_gid`
[INFO] [stderr]    --> src/main.rs:425:9
[INFO] [stderr]     |
[INFO] [stderr] 425 |     let opt_sandbox_gid = match popts.sandbox_gid {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_opt_sandbox_gid`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `proc_wd`
[INFO] [stderr]    --> src/main.rs:447:9
[INFO] [stderr]     |
[INFO] [stderr] 447 |     let proc_wd = WalkDir::new("/proc");
[INFO] [stderr]     |         ^^^^^^^ help: consider prefixing with an underscore: `_proc_wd`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `event_fd` is assigned to, but never used
[INFO] [stderr]    --> src/main.rs:467:13
[INFO] [stderr]     |
[INFO] [stderr] 467 |     let mut event_fd: Option<i32> = None;
[INFO] [stderr]     |             ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_event_fd` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `event_fd` is never read
[INFO] [stderr]    --> src/main.rs:469:9
[INFO] [stderr]     |
[INFO] [stderr] 469 |         event_fd = match eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK) {
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]    --> src/main.rs:497:17
[INFO] [stderr]     |
[INFO] [stderr] 497 |             Err(e) => panic!("stat on /proc/self/ns/cgroup failed"),
[INFO] [stderr]     |                 ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `child_wait_fd`
[INFO] [stderr]    --> src/main.rs:509:9
[INFO] [stderr]     |
[INFO] [stderr] 509 |     let child_wait_fd = match eventfd(0, EFD_CLOEXEC) {
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_child_wait_fd`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `real_gid`
[INFO] [stderr]   --> src/main.rs:54:35
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn acquire_privs(real_uid: uid_t, real_gid: uid_t) -> bool {
[INFO] [stderr]    |                                   ^^^^^^^^ help: consider prefixing with an underscore: `_real_gid`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `overflow_uid`
[INFO] [stderr]    --> src/main.rs:341:10
[INFO] [stderr]     |
[INFO] [stderr] 341 |     let (overflow_uid, overflow_gid) = read_overflowids();
[INFO] [stderr]     |          ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_overflow_uid`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `overflow_gid`
[INFO] [stderr]    --> src/main.rs:341:24
[INFO] [stderr]     |
[INFO] [stderr] 341 |     let (overflow_uid, overflow_gid) = read_overflowids();
[INFO] [stderr]     |                        ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_overflow_gid`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `host_tty_dev` is assigned to, but never used
[INFO] [stderr]    --> src/main.rs:343:13
[INFO] [stderr]     |
[INFO] [stderr] 343 |     let mut host_tty_dev: Option<String> = None;
[INFO] [stderr]     |             ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_host_tty_dev` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `host_tty_dev` is never read
[INFO] [stderr]    --> src/main.rs:345:9
[INFO] [stderr]     |
[INFO] [stderr] 345 |         host_tty_dev = Some(unsafe {
[INFO] [stderr]     |         ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `opt_sandbox_uid`
[INFO] [stderr]    --> src/main.rs:421:9
[INFO] [stderr]     |
[INFO] [stderr] 421 |     let opt_sandbox_uid = match popts.sandbox_uid {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_opt_sandbox_uid`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `opt_sandbox_gid`
[INFO] [stderr]    --> src/main.rs:425:9
[INFO] [stderr]     |
[INFO] [stderr] 425 |     let opt_sandbox_gid = match popts.sandbox_gid {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_opt_sandbox_gid`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `proc_wd`
[INFO] [stderr]    --> src/main.rs:447:9
[INFO] [stderr]     |
[INFO] [stderr] 447 |     let proc_wd = WalkDir::new("/proc");
[INFO] [stderr]     |         ^^^^^^^ help: consider prefixing with an underscore: `_proc_wd`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `event_fd` is assigned to, but never used
[INFO] [stderr]    --> src/main.rs:467:13
[INFO] [stderr]     |
[INFO] [stderr] 467 |     let mut event_fd: Option<i32> = None;
[INFO] [stderr]     |             ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_event_fd` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `event_fd` is never read
[INFO] [stderr]    --> src/main.rs:469:9
[INFO] [stderr]     |
[INFO] [stderr] 469 |         event_fd = match eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK) {
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]    --> src/main.rs:497:17
[INFO] [stderr]     |
[INFO] [stderr] 497 |             Err(e) => panic!("stat on /proc/self/ns/cgroup failed"),
[INFO] [stderr]     |                 ^ help: consider prefixing with an underscore: `_e`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `child_wait_fd`
[INFO] [stderr]    --> src/main.rs:509:9
[INFO] [stderr]     |
[INFO] [stderr] 509 |     let child_wait_fd = match eventfd(0, EFD_CLOEXEC) {
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_child_wait_fd`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.05s
[INFO] running `"docker" "inspect" "88168d7b5138b28eeb22b4ac5d11933c8b63d282777005d703cd7c86bf0be4be"`
[INFO] running `"docker" "rm" "-f" "88168d7b5138b28eeb22b4ac5d11933c8b63d282777005d703cd7c86bf0be4be"`
[INFO] [stdout] 88168d7b5138b28eeb22b4ac5d11933c8b63d282777005d703cd7c86bf0be4be