[INFO] updating cached repository manifest/mqtt-service-example-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/manifest/mqtt-service-example-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/manifest/mqtt-service-example-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/manifest/mqtt-service-example-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/manifest/mqtt-service-example-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/manifest/mqtt-service-example-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/manifest/mqtt-service-example-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/manifest/mqtt-service-example-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8eecea2efe7e6a94cd7f3fbfd861ad63d9a6599e
[INFO] sha for GitHub repo manifest/mqtt-service-example-rs: 8eecea2efe7e6a94cd7f3fbfd861ad63d9a6599e
[INFO] validating manifest of manifest/mqtt-service-example-rs 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 manifest/mqtt-service-example-rs 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 manifest/mqtt-service-example-rs
[INFO] finished frobbing manifest/mqtt-service-example-rs
[INFO] frobbed toml for manifest/mqtt-service-example-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/manifest/mqtt-service-example-rs/Cargo.toml
[INFO] started frobbing manifest/mqtt-service-example-rs
[INFO] finished frobbing manifest/mqtt-service-example-rs
[INFO] frobbed toml for manifest/mqtt-service-example-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/manifest/mqtt-service-example-rs/Cargo.toml
[INFO] crate manifest/mqtt-service-example-rs 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 manifest/mqtt-service-example-rs 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/manifest/mqtt-service-example-rs:/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] 47a91b4f23356150ba177a16da2fcf88c35d4609cc634310240677ce1a62b849
[INFO] running `"docker" "start" "-a" "47a91b4f23356150ba177a16da2fcf88c35d4609cc634310240677ce1a62b849"`
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling ring v0.13.5
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling syn v0.15.33
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]    Compiling serde-hjson v0.8.2
[INFO] [stderr]    Compiling backtrace v0.3.15
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.14
[INFO] [stderr]    Compiling rand v0.6.5
[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/futures-core-preview-0.3.0-alpha.14/src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(futures_api)]
[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 `futures-core-preview`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "47a91b4f23356150ba177a16da2fcf88c35d4609cc634310240677ce1a62b849"`
[INFO] running `"docker" "rm" "-f" "47a91b4f23356150ba177a16da2fcf88c35d4609cc634310240677ce1a62b849"`
[INFO] [stdout] 47a91b4f23356150ba177a16da2fcf88c35d4609cc634310240677ce1a62b849