[INFO] crate optional_struct 0.2.0 is already in cache
[INFO] extracting crate optional_struct 0.2.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/optional_struct/0.2.0
[INFO] extracting crate optional_struct 0.2.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/optional_struct/0.2.0
[INFO] validating manifest of optional_struct-0.2.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of optional_struct-0.2.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "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-1.37-6/sources/1.36.0/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-1.37-6/sources/beta-2019-07-23/reg/optional_struct/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing optional_struct-0.2.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] a2ba2c200974f864439921d52b94abc2aa0925dc52e0f490dacbf96eea101cf1
[INFO] running `"docker" "start" "-a" "a2ba2c200974f864439921d52b94abc2aa0925dc52e0f490dacbf96eea101cf1"`
[INFO] [stderr]    Compiling optional_struct v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.13s
[INFO] running `"docker" "inspect" "a2ba2c200974f864439921d52b94abc2aa0925dc52e0f490dacbf96eea101cf1"`
[INFO] running `"docker" "rm" "-f" "a2ba2c200974f864439921d52b94abc2aa0925dc52e0f490dacbf96eea101cf1"`
[INFO] [stdout] a2ba2c200974f864439921d52b94abc2aa0925dc52e0f490dacbf96eea101cf1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 0c81e75c302c4222b75453ff92d94d2f427450a9a0a21860372924e3499cefb7
[INFO] running `"docker" "start" "-a" "0c81e75c302c4222b75453ff92d94d2f427450a9a0a21860372924e3499cefb7"`
[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 2.16s
[INFO] running `"docker" "inspect" "0c81e75c302c4222b75453ff92d94d2f427450a9a0a21860372924e3499cefb7"`
[INFO] running `"docker" "rm" "-f" "0c81e75c302c4222b75453ff92d94d2f427450a9a0a21860372924e3499cefb7"`
[INFO] [stdout] 0c81e75c302c4222b75453ff92d94d2f427450a9a0a21860372924e3499cefb7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] afc22b87823f42654b8221571d6ff666bc0946571e007e63c8e37d9a288bff52
[INFO] running `"docker" "start" "-a" "afc22b87823f42654b8221571d6ff666bc0946571e007e63c8e37d9a288bff52"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/optional_struct-a7cb60693fb8c1e5
[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] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/derive-3c3cb00e4be23394
[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/empty-1d638f17d4312a5b
[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-8c58efd62594e5e4
[INFO] [stderr]      Running /opt/crater/target/debug/deps/nested-5e8c1177ff2d4904
[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/renamed-1a0e7f07f827e050
[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-0f3002ac4bf8dc28
[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" "afc22b87823f42654b8221571d6ff666bc0946571e007e63c8e37d9a288bff52"`
[INFO] running `"docker" "rm" "-f" "afc22b87823f42654b8221571d6ff666bc0946571e007e63c8e37d9a288bff52"`
[INFO] [stdout] afc22b87823f42654b8221571d6ff666bc0946571e007e63c8e37d9a288bff52