[INFO] updating cached repository michaelvoronov/rust_poc_1
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/michaelvoronov/rust_poc_1
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/michaelvoronov/rust_poc_1" "work/ex/beta-1.38-1/sources/1.37.0/gh/michaelvoronov/rust_poc_1"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/michaelvoronov/rust_poc_1'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/michaelvoronov/rust_poc_1" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelvoronov/rust_poc_1"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelvoronov/rust_poc_1'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6bd20d5d4d58974fe47748052545dd8c15d67719
[INFO] sha for GitHub repo michaelvoronov/rust_poc_1: 6bd20d5d4d58974fe47748052545dd8c15d67719
[INFO] validating manifest of michaelvoronov/rust_poc_1 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 michaelvoronov/rust_poc_1 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 michaelvoronov/rust_poc_1
[INFO] finished frobbing michaelvoronov/rust_poc_1
[INFO] frobbed toml for michaelvoronov/rust_poc_1 written to work/ex/beta-1.38-1/sources/1.37.0/gh/michaelvoronov/rust_poc_1/Cargo.toml
[INFO] started frobbing michaelvoronov/rust_poc_1
[INFO] finished frobbing michaelvoronov/rust_poc_1
[INFO] frobbed toml for michaelvoronov/rust_poc_1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelvoronov/rust_poc_1/Cargo.toml
[INFO] crate michaelvoronov/rust_poc_1 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 michaelvoronov/rust_poc_1 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/michaelvoronov/rust_poc_1:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 3eb91e1118a88e9260f48223d5b8c41faabae0800f2f0eb0008ad295fd0f2220
[INFO] running `"docker" "start" "-a" "3eb91e1118a88e9260f48223d5b8c41faabae0800f2f0eb0008ad295fd0f2220"`
[INFO] [stderr]    Compiling arraydeque v0.4.3
[INFO] [stderr]    Compiling rust_experiments v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: field is never used: `field`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     field: i32
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `field`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     field: ArrayDeque<[Rc<RefCell<SomeStruct>>; 1024], Wrapping>
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.93s
[INFO] running `"docker" "inspect" "3eb91e1118a88e9260f48223d5b8c41faabae0800f2f0eb0008ad295fd0f2220"`
[INFO] running `"docker" "rm" "-f" "3eb91e1118a88e9260f48223d5b8c41faabae0800f2f0eb0008ad295fd0f2220"`
[INFO] [stdout] 3eb91e1118a88e9260f48223d5b8c41faabae0800f2f0eb0008ad295fd0f2220
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/michaelvoronov/rust_poc_1:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] dd9cbe6c34f0b8aa2d3b0a139900e5606edb78ad27bcf96310732e73367a0e32
[INFO] running `"docker" "start" "-a" "dd9cbe6c34f0b8aa2d3b0a139900e5606edb78ad27bcf96310732e73367a0e32"`
[INFO] [stderr]    Compiling rust_experiments v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: field is never used: `field`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     field: i32
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `field`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     field: ArrayDeque<[Rc<RefCell<SomeStruct>>; 1024], Wrapping>
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
[INFO] running `"docker" "inspect" "dd9cbe6c34f0b8aa2d3b0a139900e5606edb78ad27bcf96310732e73367a0e32"`
[INFO] running `"docker" "rm" "-f" "dd9cbe6c34f0b8aa2d3b0a139900e5606edb78ad27bcf96310732e73367a0e32"`
[INFO] [stdout] dd9cbe6c34f0b8aa2d3b0a139900e5606edb78ad27bcf96310732e73367a0e32
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/michaelvoronov/rust_poc_1:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 920bcc991b818318e90fed563de19ce2049bb5a0d0f074ebdfeacae3962f8436
[INFO] running `"docker" "start" "-a" "920bcc991b818318e90fed563de19ce2049bb5a0d0f074ebdfeacae3962f8436"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_experiments-6243efa604935c31
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "920bcc991b818318e90fed563de19ce2049bb5a0d0f074ebdfeacae3962f8436"`
[INFO] running `"docker" "rm" "-f" "920bcc991b818318e90fed563de19ce2049bb5a0d0f074ebdfeacae3962f8436"`
[INFO] [stdout] 920bcc991b818318e90fed563de19ce2049bb5a0d0f074ebdfeacae3962f8436