[INFO] fetching crate serde_traitobject 0.1.4...
[INFO] extracting crate serde_traitobject 0.1.4 into work/ex/beta-1.37-6/sources/1.36.0/reg/serde_traitobject/0.1.4
[INFO] extracting crate serde_traitobject 0.1.4 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde_traitobject/0.1.4
[INFO] validating manifest of serde_traitobject-0.1.4 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 serde_traitobject-0.1.4 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 serde_traitobject-0.1.4
[INFO] removed 0 missing tests
[INFO] finished frobbing serde_traitobject-0.1.4
[INFO] frobbed toml for serde_traitobject-0.1.4 written to work/ex/beta-1.37-6/sources/1.36.0/reg/serde_traitobject/0.1.4/Cargo.toml
[INFO] started frobbing serde_traitobject-0.1.4
[INFO] removed 0 missing tests
[INFO] finished frobbing serde_traitobject-0.1.4
[INFO] frobbed toml for serde_traitobject-0.1.4 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde_traitobject/0.1.4/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded build_id v0.1.5
[INFO] [stderr]   Downloaded relative v0.1.4
[INFO] [stderr]   Downloaded serde_closure v0.1.5
[INFO] [stderr]   Downloaded metatype v0.1.2
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing serde_traitobject-0.1.4 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-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/serde_traitobject/0.1.4:/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] ffca5d08fbfa70ca6e60c3f2a4ebba6bc02d15b16710371b126c3a1f37727d7a
[INFO] running `"docker" "start" "-a" "ffca5d08fbfa70ca6e60c3f2a4ebba6bc02d15b16710371b126c3a1f37727d7a"`
[INFO] [stderr]    Compiling metatype v0.1.2
[INFO] [stderr]    Compiling palaver v0.2.5
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/metatype-0.1.2/src/lib.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | #![feature(raw, box_syntax, specialization)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `metatype`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/uuid-0.7.4/src/lib.rs:118:35
[INFO] [stderr]     |
[INFO] [stderr] 118 | #![cfg_attr(feature = "const_fn", feature(const_fn))]
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `uuid`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "ffca5d08fbfa70ca6e60c3f2a4ebba6bc02d15b16710371b126c3a1f37727d7a"`
[INFO] running `"docker" "rm" "-f" "ffca5d08fbfa70ca6e60c3f2a4ebba6bc02d15b16710371b126c3a1f37727d7a"`
[INFO] [stdout] ffca5d08fbfa70ca6e60c3f2a4ebba6bc02d15b16710371b126c3a1f37727d7a