[INFO] updating cached repository mlsteele/bittles [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/mlsteele/bittles [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/mlsteele/bittles" "work/ex/beta-1.38-1/sources/1.37.0/gh/mlsteele/bittles"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mlsteele/bittles'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/mlsteele/bittles" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mlsteele/bittles"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mlsteele/bittles'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 68441273c2e5aaa5e7e19d35c2b8fdeee0ac92af [INFO] sha for GitHub repo mlsteele/bittles: 68441273c2e5aaa5e7e19d35c2b8fdeee0ac92af [INFO] validating manifest of mlsteele/bittles 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 mlsteele/bittles 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 mlsteele/bittles [INFO] finished frobbing mlsteele/bittles [INFO] frobbed toml for mlsteele/bittles written to work/ex/beta-1.38-1/sources/1.37.0/gh/mlsteele/bittles/Cargo.toml [INFO] started frobbing mlsteele/bittles [INFO] finished frobbing mlsteele/bittles [INFO] frobbed toml for mlsteele/bittles written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mlsteele/bittles/Cargo.toml [INFO] crate mlsteele/bittles 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 mlsteele/bittles 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/gh/mlsteele/bittles:/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] 2d031cbe4fb88ee71ff79a67e2ec97d1c0fa6e9dfe36c148862d1b0046d9bd6b [INFO] running `"docker" "start" "-a" "2d031cbe4fb88ee71ff79a67e2ec97d1c0fa6e9dfe36c148862d1b0046d9bd6b"` [INFO] [stderr] Compiling rayon-core v1.0.0 [INFO] [stderr] Compiling futures v0.1.13 [INFO] [stderr] Compiling slog v2.0.5 [INFO] [stderr] Compiling untrusted v0.3.2 [INFO] [stderr] Compiling take_mut v0.1.3 [INFO] [stderr] Compiling iovec v0.1.0 [INFO] [stderr] Compiling isatty v0.1.3 [INFO] [stderr] Compiling backtrace-sys v0.1.10 [INFO] [stderr] Compiling net2 v0.2.27 [INFO] [stderr] Compiling serde_cbor v0.5.2 [INFO] [stderr] Compiling deque v0.3.1 [INFO] [stderr] Compiling aho-corasick v0.6.3 [INFO] [stderr] error[E0446]: private type `NeverStruct` in public interface [INFO] [stderr] --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/slog-2.0.5/src/lib.rs:1180:5 [INFO] [stderr] | [INFO] [stderr] 1180 | type Err = Never; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ can't leak private type [INFO] [stderr] ... [INFO] [stderr] 2868 | struct NeverStruct(()); [INFO] [stderr] | - `NeverStruct` declared as private [INFO] [stderr] [INFO] [stderr] error[E0446]: private type `NeverStruct` in public interface [INFO] [stderr] --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/slog-2.0.5/src/lib.rs:1465:5 [INFO] [stderr] | [INFO] [stderr] 1465 | type Err = Never; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ can't leak private type [INFO] [stderr] ... [INFO] [stderr] 2868 | struct NeverStruct(()); [INFO] [stderr] | - `NeverStruct` declared as private [INFO] [stderr] Compiling bytes v0.4.3 [INFO] [stderr] [INFO] [stderr] error[E0446]: private type `NeverStruct` in public interface [INFO] [stderr] --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/slog-2.0.5/src/lib.rs:1630:5 [INFO] [stderr] | [INFO] [stderr] 1630 | type Err = Never; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ can't leak private type [INFO] [stderr] ... [INFO] [stderr] 2868 | struct NeverStruct(()); [INFO] [stderr] | - `NeverStruct` declared as private [INFO] [stderr] [INFO] [stderr] error[E0446]: private type `NeverStruct` in public interface [INFO] [stderr] --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/slog-2.0.5/src/lib.rs:1662:5 [INFO] [stderr] | [INFO] [stderr] 1662 | type Err = Never; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ can't leak private type [INFO] [stderr] ... [INFO] [stderr] 2868 | struct NeverStruct(()); [INFO] [stderr] | - `NeverStruct` declared as private [INFO] [stderr] [INFO] [stderr] error: aborting due to 4 previous errors [INFO] [stderr] [INFO] [stderr] For more information about this error, try `rustc --explain E0446`. [INFO] [stderr] error: Could not compile `slog`. [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] error: build failed [INFO] running `"docker" "inspect" "2d031cbe4fb88ee71ff79a67e2ec97d1c0fa6e9dfe36c148862d1b0046d9bd6b"` [INFO] running `"docker" "rm" "-f" "2d031cbe4fb88ee71ff79a67e2ec97d1c0fa6e9dfe36c148862d1b0046d9bd6b"` [INFO] [stdout] 2d031cbe4fb88ee71ff79a67e2ec97d1c0fa6e9dfe36c148862d1b0046d9bd6b