[INFO] updating cached repository rustyhorde/twists
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rustyhorde/twists
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rustyhorde/twists" "work/ex/beta-1.38-1/sources/1.37.0/gh/rustyhorde/twists"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/rustyhorde/twists'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rustyhorde/twists" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rustyhorde/twists"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rustyhorde/twists'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4490db4201265c28c9f05f469d0d010181f65b22
[INFO] sha for GitHub repo rustyhorde/twists: 4490db4201265c28c9f05f469d0d010181f65b22
[INFO] validating manifest of rustyhorde/twists 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 rustyhorde/twists 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 rustyhorde/twists
[INFO] finished frobbing rustyhorde/twists
[INFO] frobbed toml for rustyhorde/twists written to work/ex/beta-1.38-1/sources/1.37.0/gh/rustyhorde/twists/Cargo.toml
[INFO] started frobbing rustyhorde/twists
[INFO] finished frobbing rustyhorde/twists
[INFO] frobbed toml for rustyhorde/twists written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rustyhorde/twists/Cargo.toml
[INFO] crate rustyhorde/twists 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 rustyhorde/twists 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/rustyhorde/twists:/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] 25a70303891200f2d33e975cf346d90b8666761457d76ff6c38e781d43cd4d7a
[INFO] running `"docker" "start" "-a" "25a70303891200f2d33e975cf346d90b8666761457d76ff6c38e781d43cd4d7a"`
[INFO] [stderr]    Compiling slog v1.5.2
[INFO] [stderr]    Compiling bitflags v0.7.0
[INFO] [stderr]    Compiling crossbeam v0.2.10
[INFO] [stderr]    Compiling foreign-types v0.2.0
[INFO] [stderr]    Compiling untrusted v0.3.2
[INFO] [stderr]    Compiling httparse v1.2.1
[INFO] [stderr]    Compiling itoa v0.3.1
[INFO] [stderr]    Compiling dtoa v0.4.1
[INFO] [stderr]    Compiling byteorder v0.5.3
[INFO] [stderr]    Compiling sha1 v0.2.0
[INFO] [stderr] error[E0277]: `*mut (dyn core::ops::Fn() + 'static)` cannot be shared between threads safely
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/slog-1.5.2/src/ser.rs:228:6
[INFO] [stderr]     |
[INFO] [stderr] 228 | impl SyncSerialize for fmt::Arguments<'static> {}
[INFO] [stderr]     |      ^^^^^^^^^^^^^ `*mut (dyn core::ops::Fn() + 'static)` cannot be shared between threads safely
[INFO] [stderr]     |
[INFO] [stderr]     = help: within `core::fmt::Arguments<'static>`, the trait `core::marker::Sync` is not implemented for `*mut (dyn core::ops::Fn() + 'static)`
[INFO] [stderr]     = note: required because it appears within the type `core::marker::PhantomData<*mut (dyn core::ops::Fn() + 'static)>`
[INFO] [stderr]     = note: required because it appears within the type `core::fmt::Void`
[INFO] [stderr]     = note: required because it appears within the type `&'static core::fmt::Void`
[INFO] [stderr]     = note: required because it appears within the type `core::fmt::ArgumentV1<'static>`
[INFO] [stderr]     = note: required because it appears within the type `[core::fmt::ArgumentV1<'static>]`
[INFO] [stderr]     = note: required because it appears within the type `&'static [core::fmt::ArgumentV1<'static>]`
[INFO] [stderr]     = note: required because it appears within the type `core::fmt::Arguments<'static>`
[INFO] [stderr] 
[INFO] [stderr]    Compiling serde v0.9.13
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr]    Compiling slog v2.0.0-3.1
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `slog`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0446]: private type `NeverStruct` in public interface
[INFO] [stderr]     --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/slog-2.0.0-3.1/src/lib.rs:988:5
[INFO] [stderr]      |
[INFO] [stderr] 988  |     type Err = Never;
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^ can't leak private type
[INFO] [stderr] ...
[INFO] [stderr] 2650 | 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-2.0.0-3.1/src/lib.rs:1271:5
[INFO] [stderr]      |
[INFO] [stderr] 1271 |     type Err = Never;
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^ can't leak private type
[INFO] [stderr] ...
[INFO] [stderr] 2650 | 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-2.0.0-3.1/src/lib.rs:1434:5
[INFO] [stderr]      |
[INFO] [stderr] 1434 |     type Err = Never;
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^ can't leak private type
[INFO] [stderr] ...
[INFO] [stderr] 2650 | 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-2.0.0-3.1/src/lib.rs:1466:5
[INFO] [stderr]      |
[INFO] [stderr] 1466 |     type Err = Never;
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^ can't leak private type
[INFO] [stderr] ...
[INFO] [stderr] 2650 | 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" "25a70303891200f2d33e975cf346d90b8666761457d76ff6c38e781d43cd4d7a"`
[INFO] running `"docker" "rm" "-f" "25a70303891200f2d33e975cf346d90b8666761457d76ff6c38e781d43cd4d7a"`
[INFO] [stdout] 25a70303891200f2d33e975cf346d90b8666761457d76ff6c38e781d43cd4d7a