[INFO] crate tokio-sync 0.1.6 is already in cache
[INFO] extracting crate tokio-sync 0.1.6 into work/ex/pr-62181/sources/master#6ea4036cd20a4b1ab1d56e555108c21735ff6946/reg/tokio-sync/0.1.6
[INFO] extracting crate tokio-sync 0.1.6 into work/ex/pr-62181/sources/try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc/reg/tokio-sync/0.1.6
[INFO] validating manifest of tokio-sync-0.1.6 on toolchain master#6ea4036cd20a4b1ab1d56e555108c21735ff6946
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ea4036cd20a4b1ab1d56e555108c21735ff6946-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tokio-sync-0.1.6 on toolchain try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+003a7b6b5753e8509fdfe7949d4f0873ba71e4fc-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tokio-sync-0.1.6
[INFO] finished frobbing tokio-sync-0.1.6
[INFO] frobbed toml for tokio-sync-0.1.6 written to work/ex/pr-62181/sources/master#6ea4036cd20a4b1ab1d56e555108c21735ff6946/reg/tokio-sync/0.1.6/Cargo.toml
[INFO] started frobbing tokio-sync-0.1.6
[INFO] finished frobbing tokio-sync-0.1.6
[INFO] frobbed toml for tokio-sync-0.1.6 written to work/ex/pr-62181/sources/try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc/reg/tokio-sync/0.1.6/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ea4036cd20a4b1ab1d56e555108c21735ff6946-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+003a7b6b5753e8509fdfe7949d4f0873ba71e4fc-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ea4036cd20a4b1ab1d56e555108c21735ff6946-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+003a7b6b5753e8509fdfe7949d4f0873ba71e4fc-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking tokio-sync-0.1.6 against try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc for pr-62181
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62181/worker-6/try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62181/sources/try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc/reg/tokio-sync/0.1.6:/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" "+003a7b6b5753e8509fdfe7949d4f0873ba71e4fc-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 0dc80eb7fd25206cb38a577cf03b7f29aa1d251e3053a168907dce97879d349b
[INFO] running `"docker" "start" "-a" "0dc80eb7fd25206cb38a577cf03b7f29aa1d251e3053a168907dce97879d349b"`
[INFO] [stderr]     Checking tokio-mock-task v0.1.1
[INFO] [stderr]     Checking tokio-sync v0.1.6 (/opt/crater/workdir)
[INFO] [stderr]     Checking loom v0.1.1
[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]     Finished dev [unoptimized + debuginfo] target(s) in 3.67s
[INFO] running `"docker" "inspect" "0dc80eb7fd25206cb38a577cf03b7f29aa1d251e3053a168907dce97879d349b"`
[INFO] running `"docker" "rm" "-f" "0dc80eb7fd25206cb38a577cf03b7f29aa1d251e3053a168907dce97879d349b"`
[INFO] [stdout] 0dc80eb7fd25206cb38a577cf03b7f29aa1d251e3053a168907dce97879d349b