[INFO] crate dlx 0.1.0 is already in cache
[INFO] extracting crate dlx 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/dlx/0.1.0
[INFO] extracting crate dlx 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/dlx/0.1.0
[INFO] validating manifest of dlx-0.1.0 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 dlx-0.1.0 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 dlx-0.1.0
[INFO] finished frobbing dlx-0.1.0
[INFO] frobbed toml for dlx-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/dlx/0.1.0/Cargo.toml
[INFO] started frobbing dlx-0.1.0
[INFO] finished frobbing dlx-0.1.0
[INFO] frobbed toml for dlx-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/dlx/0.1.0/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 dlx-0.1.0 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-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/dlx/0.1.0:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] db836716d19896f39287db84518b95b191118436c930ca54acb5b54138257bfc
[INFO] running `"docker" "start" "-a" "db836716d19896f39287db84518b95b191118436c930ca54acb5b54138257bfc"`
[INFO] [stderr]    Compiling dlx v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:178:59
[INFO] [stderr]     |
[INFO] [stderr] 178 |     pub fn solve(&mut self, partial: Vec<Row>, sols: &mut Solutions) {
[INFO] [stderr]     |                                                           ^^^^^^^^^ help: use `dyn`: `dyn Solutions`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:197:60
[INFO] [stderr]     |
[INFO] [stderr] 197 |     fn solveception(&mut self, partial: &[Row], sols: &mut Solutions) {
[INFO] [stderr]     |                                                            ^^^^^^^^^ help: use `dyn`: `dyn Solutions`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `"docker" "inspect" "db836716d19896f39287db84518b95b191118436c930ca54acb5b54138257bfc"`
[INFO] running `"docker" "rm" "-f" "db836716d19896f39287db84518b95b191118436c930ca54acb5b54138257bfc"`
[INFO] [stdout] db836716d19896f39287db84518b95b191118436c930ca54acb5b54138257bfc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/dlx/0.1.0:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] e5c513600e19bc7a27f88dca9236ecd790bea75a7e104549a72384a8423271a4
[INFO] running `"docker" "start" "-a" "e5c513600e19bc7a27f88dca9236ecd790bea75a7e104549a72384a8423271a4"`
[INFO] [stderr]    Compiling dlx v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> examples/sudoku.rs:91:9
[INFO] [stderr]    |
[INFO] [stderr] 91 | /         /// Convert the rows from the exact cover matrix into a
[INFO] [stderr] 92 | |         /// standard sudoku grid.
[INFO] [stderr]    | |_________________________________^
[INFO] [stderr] 93 |           let mut grid = vec![b'0'; SIZE_SQ];
[INFO] [stderr]    |           ----------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:178:59
[INFO] [stderr]     |
[INFO] [stderr] 178 |     pub fn solve(&mut self, partial: Vec<Row>, sols: &mut Solutions) {
[INFO] [stderr]     |                                                           ^^^^^^^^^ help: use `dyn`: `dyn Solutions`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:197:60
[INFO] [stderr]     |
[INFO] [stderr] 197 |     fn solveception(&mut self, partial: &[Row], sols: &mut Solutions) {
[INFO] [stderr]     |                                                            ^^^^^^^^^ help: use `dyn`: `dyn Solutions`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `"docker" "inspect" "e5c513600e19bc7a27f88dca9236ecd790bea75a7e104549a72384a8423271a4"`
[INFO] running `"docker" "rm" "-f" "e5c513600e19bc7a27f88dca9236ecd790bea75a7e104549a72384a8423271a4"`
[INFO] [stdout] e5c513600e19bc7a27f88dca9236ecd790bea75a7e104549a72384a8423271a4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/dlx/0.1.0:/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] b97e9d9d3bae7acabe1aabd8b2cca0cf06371322a37dd7111d4709a9a6bf81f5
[INFO] running `"docker" "start" "-a" "b97e9d9d3bae7acabe1aabd8b2cca0cf06371322a37dd7111d4709a9a6bf81f5"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/dlx-5a904095b33debec
[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]    Doc-tests dlx
[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" "b97e9d9d3bae7acabe1aabd8b2cca0cf06371322a37dd7111d4709a9a6bf81f5"`
[INFO] running `"docker" "rm" "-f" "b97e9d9d3bae7acabe1aabd8b2cca0cf06371322a37dd7111d4709a9a6bf81f5"`
[INFO] [stdout] b97e9d9d3bae7acabe1aabd8b2cca0cf06371322a37dd7111d4709a9a6bf81f5