[INFO] crate optional_struct 0.2.0 is already in cache
[INFO] extracting crate optional_struct 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/optional_struct/0.2.0
[INFO] extracting crate optional_struct 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/optional_struct/0.2.0
[INFO] validating manifest of optional_struct-0.2.0 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 optional_struct-0.2.0 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 optional_struct-0.2.0
[INFO] finished frobbing optional_struct-0.2.0
[INFO] frobbed toml for optional_struct-0.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/optional_struct/0.2.0/Cargo.toml
[INFO] started frobbing optional_struct-0.2.0
[INFO] finished frobbing optional_struct-0.2.0
[INFO] frobbed toml for optional_struct-0.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/optional_struct/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 optional_struct-0.2.0 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/optional_struct/0.2.0:/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] 0220c9d6598e3f62deaa429be2fff42a883fc7e1a82465bef527eb4e46205727
[INFO] running `"docker" "start" "-a" "0220c9d6598e3f62deaa429be2fff42a883fc7e1a82465bef527eb4e46205727"`
[INFO] [stderr]    Compiling optional_struct v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.63s
[INFO] running `"docker" "inspect" "0220c9d6598e3f62deaa429be2fff42a883fc7e1a82465bef527eb4e46205727"`
[INFO] running `"docker" "rm" "-f" "0220c9d6598e3f62deaa429be2fff42a883fc7e1a82465bef527eb4e46205727"`
[INFO] [stdout] 0220c9d6598e3f62deaa429be2fff42a883fc7e1a82465bef527eb4e46205727
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/optional_struct/0.2.0:/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] fa2a25662cf10e2f14ce84124bdb769b47e31517cd57d746e2bfabaa799a7ca3
[INFO] running `"docker" "start" "-a" "fa2a25662cf10e2f14ce84124bdb769b47e31517cd57d746e2bfabaa799a7ca3"`
[INFO] [stderr]    Compiling optional_struct v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `Config`
[INFO] [stderr]  --> tests/empty.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct Config {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.09s
[INFO] running `"docker" "inspect" "fa2a25662cf10e2f14ce84124bdb769b47e31517cd57d746e2bfabaa799a7ca3"`
[INFO] running `"docker" "rm" "-f" "fa2a25662cf10e2f14ce84124bdb769b47e31517cd57d746e2bfabaa799a7ca3"`
[INFO] [stdout] fa2a25662cf10e2f14ce84124bdb769b47e31517cd57d746e2bfabaa799a7ca3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/optional_struct/0.2.0:/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] 407aa675c553305ca5f34ad20e6b772f03c40e61b3a532d3e9ecc81f89fc7d2e
[INFO] running `"docker" "start" "-a" "407aa675c553305ca5f34ad20e6b772f03c40e61b3a532d3e9ecc81f89fc7d2e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/optional_struct-44abbf1ff70c7e05
[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] [stderr]      Running /opt/crater/target/debug/deps/derive-e4de15a37b3dd35e
[INFO] [stderr]      Running /opt/crater/target/debug/deps/empty-33972de85152e423
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_apply_options ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_apply_options ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/generics-19c2d6eedecaf286
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_apply_options ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/nested-b04bdba27268de02
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_apply_options ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/renamed-9ba29c465683ebb4
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_apply_options ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/simple-5a6f387fd8b5e653
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_apply_options ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests optional_struct
[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" "407aa675c553305ca5f34ad20e6b772f03c40e61b3a532d3e9ecc81f89fc7d2e"`
[INFO] running `"docker" "rm" "-f" "407aa675c553305ca5f34ad20e6b772f03c40e61b3a532d3e9ecc81f89fc7d2e"`
[INFO] [stdout] 407aa675c553305ca5f34ad20e6b772f03c40e61b3a532d3e9ecc81f89fc7d2e