[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/beta-1.38-1/sources/1.37.0/gh/TechnoCrunch/Rust-Multithreading"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/TechnoCrunch/Rust-Multithreading'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/TechnoCrunch/Rust-Multithreading" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/TechnoCrunch/Rust-Multithreading"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of TechnoCrunch/Rust-Multithreading on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "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/beta-1.38-1/sources/1.37.0/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/beta-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing TechnoCrunch/Rust-Multithreading against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] ed5ca118b53193fbbf5944c12d5739d3bb4e887861c1fe7c55d77e073ab0744d
[INFO] running `"docker" "start" "-a" "ed5ca118b53193fbbf5944c12d5739d3bb4e887861c1fe7c55d77e073ab0744d"`
[INFO] [stderr]    Compiling num_cpus v1.2.1
[INFO] [stderr]    Compiling 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 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 2.06s
[INFO] running `"docker" "inspect" "ed5ca118b53193fbbf5944c12d5739d3bb4e887861c1fe7c55d77e073ab0744d"`
[INFO] running `"docker" "rm" "-f" "ed5ca118b53193fbbf5944c12d5739d3bb4e887861c1fe7c55d77e073ab0744d"`
[INFO] [stdout] ed5ca118b53193fbbf5944c12d5739d3bb4e887861c1fe7c55d77e073ab0744d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 7db4b16153a197820aa7fc22a8fa7b8b1472b0cd55b1051b1c38f4a0e6b48c19
[INFO] running `"docker" "start" "-a" "7db4b16153a197820aa7fc22a8fa7b8b1472b0cd55b1051b1c38f4a0e6b48c19"`
[INFO] [stderr]    Compiling 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 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 0.51s
[INFO] running `"docker" "inspect" "7db4b16153a197820aa7fc22a8fa7b8b1472b0cd55b1051b1c38f4a0e6b48c19"`
[INFO] running `"docker" "rm" "-f" "7db4b16153a197820aa7fc22a8fa7b8b1472b0cd55b1051b1c38f4a0e6b48c19"`
[INFO] [stdout] 7db4b16153a197820aa7fc22a8fa7b8b1472b0cd55b1051b1c38f4a0e6b48c19
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 7021ac12cae835691512826e2b6cdb5066aecee972b54177525e40f1c3c5ac2c
[INFO] running `"docker" "start" "-a" "7021ac12cae835691512826e2b6cdb5066aecee972b54177525e40f1c3c5ac2c"`
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/multithreads-62f0e6ef165dc8cb
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "7021ac12cae835691512826e2b6cdb5066aecee972b54177525e40f1c3c5ac2c"`
[INFO] running `"docker" "rm" "-f" "7021ac12cae835691512826e2b6cdb5066aecee972b54177525e40f1c3c5ac2c"`
[INFO] [stdout] 7021ac12cae835691512826e2b6cdb5066aecee972b54177525e40f1c3c5ac2c