[INFO] crate pumpkindb_mio_server 0.2.0 is already in cache
[INFO] extracting crate pumpkindb_mio_server 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/pumpkindb_mio_server/0.2.0
[INFO] extracting crate pumpkindb_mio_server 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pumpkindb_mio_server/0.2.0
[INFO] validating manifest of pumpkindb_mio_server-0.2.0 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 pumpkindb_mio_server-0.2.0 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 pumpkindb_mio_server-0.2.0
[INFO] finished frobbing pumpkindb_mio_server-0.2.0
[INFO] frobbed toml for pumpkindb_mio_server-0.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/pumpkindb_mio_server/0.2.0/Cargo.toml
[INFO] started frobbing pumpkindb_mio_server-0.2.0
[INFO] finished frobbing pumpkindb_mio_server-0.2.0
[INFO] frobbed toml for pumpkindb_mio_server-0.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pumpkindb_mio_server/0.2.0/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 pumpkindb_mio_server-0.2.0 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/reg/pumpkindb_mio_server/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] f540268567858840462e517c56f48ef81c90f8dd46cb35e4ff05ca25bcf0099e
[INFO] running `"docker" "start" "-a" "f540268567858840462e517c56f48ef81c90f8dd46cb35e4ff05ca25bcf0099e"`
[INFO] [stderr]    Compiling linked-hash-map v0.3.0
[INFO] [stderr]    Compiling hex-slice v0.1.4
[INFO] [stderr]    Compiling supercow v0.1.0
[INFO] [stderr]    Compiling liblmdb-sys v0.2.2
[INFO] [stderr]    Compiling toml v0.3.2
[INFO] [stderr]    Compiling config v0.3.1
[INFO] [stderr]    Compiling memmap v0.5.2
[INFO] [stderr]    Compiling serde_cbor v0.6.1
[INFO] [stderr]    Compiling ordered-float v0.4.0
[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/config-0.3.1/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(drop_types_in_const)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/config-0.3.1/src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(trace_macros)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `config`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "f540268567858840462e517c56f48ef81c90f8dd46cb35e4ff05ca25bcf0099e"`
[INFO] running `"docker" "rm" "-f" "f540268567858840462e517c56f48ef81c90f8dd46cb35e4ff05ca25bcf0099e"`
[INFO] [stdout] f540268567858840462e517c56f48ef81c90f8dd46cb35e4ff05ca25bcf0099e