[INFO] updating cached repository fluencelabs/rust-template
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/fluencelabs/rust-template
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/fluencelabs/rust-template" "work/ex/beta-1.38-1/sources/1.37.0/gh/fluencelabs/rust-template"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/fluencelabs/rust-template'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/fluencelabs/rust-template" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fluencelabs/rust-template"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fluencelabs/rust-template'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5be73432dc75e0e22a468e19c6cc93894e9499b4
[INFO] sha for GitHub repo fluencelabs/rust-template: 5be73432dc75e0e22a468e19c6cc93894e9499b4
[INFO] validating manifest of fluencelabs/rust-template 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 fluencelabs/rust-template 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 fluencelabs/rust-template
[INFO] finished frobbing fluencelabs/rust-template
[INFO] frobbed toml for fluencelabs/rust-template written to work/ex/beta-1.38-1/sources/1.37.0/gh/fluencelabs/rust-template/Cargo.toml
[INFO] started frobbing fluencelabs/rust-template
[INFO] finished frobbing fluencelabs/rust-template
[INFO] frobbed toml for fluencelabs/rust-template written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/fluencelabs/rust-template/Cargo.toml
[INFO] crate fluencelabs/rust-template 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing fluencelabs/rust-template 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/fluencelabs/rust-template:/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] de6ce1bc8ea9c8cb6bac8d4c53a486d8378ca1c27d26dd7e774ac275bf8a0f6a
[INFO] running `"docker" "start" "-a" "de6ce1bc8ea9c8cb6bac8d4c53a486d8378ca1c27d26dd7e774ac275bf8a0f6a"`
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling fluence-sdk-main v0.1.4
[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/fluence-sdk-main-0.1.4/src/lib.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![feature(allocator_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 `fluence-sdk-main`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "de6ce1bc8ea9c8cb6bac8d4c53a486d8378ca1c27d26dd7e774ac275bf8a0f6a"`
[INFO] running `"docker" "rm" "-f" "de6ce1bc8ea9c8cb6bac8d4c53a486d8378ca1c27d26dd7e774ac275bf8a0f6a"`
[INFO] [stdout] de6ce1bc8ea9c8cb6bac8d4c53a486d8378ca1c27d26dd7e774ac275bf8a0f6a