[INFO] crate tokio-sync 0.1.4 is already in cache
[INFO] extracting crate tokio-sync 0.1.4 into work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/reg/tokio-sync/0.1.4
[INFO] extracting crate tokio-sync 0.1.4 into work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/reg/tokio-sync/0.1.4
[INFO] validating manifest of tokio-sync-0.1.4 on toolchain master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tokio-sync-0.1.4 on toolchain try#58b21121d0b447ceb3f1a655155d802191acf044
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tokio-sync-0.1.4
[INFO] finished frobbing tokio-sync-0.1.4
[INFO] frobbed toml for tokio-sync-0.1.4 written to work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/reg/tokio-sync/0.1.4/Cargo.toml
[INFO] started frobbing tokio-sync-0.1.4
[INFO] finished frobbing tokio-sync-0.1.4
[INFO] frobbed toml for tokio-sync-0.1.4 written to work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/reg/tokio-sync/0.1.4/Cargo.toml
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking tokio-sync-0.1.4 against try#58b21121d0b447ceb3f1a655155d802191acf044 for pr-61100
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-61100/worker-7/try#58b21121d0b447ceb3f1a655155d802191acf044:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/reg/tokio-sync/0.1.4:/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" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] ee6f8b75ea60d8d39dd330aec097f37e6c0ce22f59bf64fa507c4b8411b66b8d
[INFO] running `"docker" "start" "-a" "ee6f8b75ea60d8d39dd330aec097f37e6c0ce22f59bf64fa507c4b8411b66b8d"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]     Checking tokio-sync v0.1.4 (/opt/crater/workdir)
[INFO] [stderr]     Checking tokio-mock-task v0.1.1
[INFO] [stderr]     Checking loom v0.1.1
[INFO] [stderr] warning: the item `Relaxed` is imported redundantly
[INFO] [stderr]    --> src/mpsc/list.rs:218:13
[INFO] [stderr]     |
[INFO] [stderr] 12  | use std::sync::atomic::Ordering::{AcqRel, Acquire, Relaxed, Release};
[INFO] [stderr]     |                                                    ------- the item `Relaxed` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 218 |         use std::sync::atomic::Ordering::Relaxed;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Relaxed` is imported redundantly
[INFO] [stderr]    --> src/semaphore.rs:535:13
[INFO] [stderr]     |
[INFO] [stderr] 24  | use std::sync::atomic::Ordering::{self, AcqRel, Acquire, Relaxed, Release};
[INFO] [stderr]     |                                                          ------- the item `Relaxed` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 535 |         use std::sync::atomic::Ordering::Relaxed;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning[E0381]: use of possibly uninitialized variable: `_`
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/loom-0.1.1/src/rt/scheduler/std.rs:238:13
[INFO] [stderr]     |
[INFO] [stderr] 238 | /             loop {
[INFO] [stderr] 239 | |                 match *th {
[INFO] [stderr] 240 | |                     Idle => {
[INFO] [stderr] 241 | |                         th = shared.condvars[i].wait(th).unwrap();
[INFO] [stderr] ...   |
[INFO] [stderr] 251 | |                 }
[INFO] [stderr] 252 | |             }
[INFO] [stderr]     | |_____________^ use of possibly uninitialized value
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr] error: the item `Relaxed` is imported redundantly
[INFO] [stderr]    --> src/mpsc/list.rs:218:13
[INFO] [stderr]     |
[INFO] [stderr] 12  | use std::sync::atomic::Ordering::{AcqRel, Acquire, Relaxed, Release};
[INFO] [stderr]     |                                                    ------- the item `Relaxed` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 218 |         use std::sync::atomic::Ordering::Relaxed;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]    --> src/lib.rs:3:24
[INFO] [stderr]     |
[INFO] [stderr] 3   | #![cfg_attr(test, deny(warnings))]
[INFO] [stderr]     |                        ^^^^^^^^
[INFO] [stderr]     = note: #[deny(unused_imports)] implied by #[deny(warnings)]
[INFO] [stderr] 
[INFO] [stderr] error: the item `Relaxed` is imported redundantly
[INFO] [stderr]    --> src/semaphore.rs:535:13
[INFO] [stderr]     |
[INFO] [stderr] 24  | use std::sync::atomic::Ordering::{self, AcqRel, Acquire, Relaxed, Release};
[INFO] [stderr]     |                                                          ------- the item `Relaxed` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 535 |         use std::sync::atomic::Ordering::Relaxed;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `tokio-sync`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "ee6f8b75ea60d8d39dd330aec097f37e6c0ce22f59bf64fa507c4b8411b66b8d"`
[INFO] running `"docker" "rm" "-f" "ee6f8b75ea60d8d39dd330aec097f37e6c0ce22f59bf64fa507c4b8411b66b8d"`
[INFO] [stdout] ee6f8b75ea60d8d39dd330aec097f37e6c0ce22f59bf64fa507c4b8411b66b8d