[INFO] updating cached repository TechnoCrunch/Rust-Multithreading
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/TechnoCrunch/Rust-Multithreading
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/TechnoCrunch/Rust-Multithreading" "work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/TechnoCrunch/Rust-Multithreading"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/TechnoCrunch/Rust-Multithreading'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/TechnoCrunch/Rust-Multithreading" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/TechnoCrunch/Rust-Multithreading"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/TechnoCrunch/Rust-Multithreading'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8356b7529c0b5d574c66ee2fc6198f3a051efb4f
[INFO] sha for GitHub repo TechnoCrunch/Rust-Multithreading: 8356b7529c0b5d574c66ee2fc6198f3a051efb4f
[INFO] validating manifest of TechnoCrunch/Rust-Multithreading 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 TechnoCrunch/Rust-Multithreading 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 TechnoCrunch/Rust-Multithreading
[INFO] finished frobbing TechnoCrunch/Rust-Multithreading
[INFO] frobbed toml for TechnoCrunch/Rust-Multithreading written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/TechnoCrunch/Rust-Multithreading/Cargo.toml
[INFO] started frobbing TechnoCrunch/Rust-Multithreading
[INFO] finished frobbing TechnoCrunch/Rust-Multithreading
[INFO] frobbed toml for TechnoCrunch/Rust-Multithreading written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/TechnoCrunch/Rust-Multithreading/Cargo.toml
[INFO] crate TechnoCrunch/Rust-Multithreading 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 TechnoCrunch/Rust-Multithreading against try#99a7498759a22b5684caf798a98b7e90ad9d2443 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-2/try#99a7498759a22b5684caf798a98b7e90ad9d2443:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/TechnoCrunch/Rust-Multithreading:/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" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 6ff56c6fefd49380c03a8e7f5348a94595c6a763dad403b4e26d5b816a188846
[INFO] running `"docker" "start" "-a" "6ff56c6fefd49380c03a8e7f5348a94595c6a763dad403b4e26d5b816a188846"`
[INFO] [stderr]     Checking multithreads v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::time`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::time;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Cell`, `RefCell`
[INFO] [stderr]  --> src/main.rs:8:17
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::cell::{Cell, RefCell};
[INFO] [stderr]   |                 ^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::time;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Cell`, `RefCell`
[INFO] [stderr]  --> src/main.rs:8:17
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::cell::{Cell, RefCell};
[INFO] [stderr]   |                 ^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item`
[INFO] [stderr]   --> src/main.rs:38:17
[INFO] [stderr]    |
[INFO] [stderr] 38 |             let item = thread_items.lock().unwrap();
[INFO] [stderr]    |                 ^^^^ help: consider prefixing with an underscore: `_item`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item`
[INFO] [stderr]   --> src/main.rs:38:17
[INFO] [stderr]    |
[INFO] [stderr] 38 |             let item = thread_items.lock().unwrap();
[INFO] [stderr]    |                 ^^^^ help: consider prefixing with an underscore: `_item`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `"docker" "inspect" "6ff56c6fefd49380c03a8e7f5348a94595c6a763dad403b4e26d5b816a188846"`
[INFO] running `"docker" "rm" "-f" "6ff56c6fefd49380c03a8e7f5348a94595c6a763dad403b4e26d5b816a188846"`
[INFO] [stdout] 6ff56c6fefd49380c03a8e7f5348a94595c6a763dad403b4e26d5b816a188846