[INFO] updating cached repository https://github.com/pepyakin/substrate-contracts-adder
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 12f8f105ad48734e69461ae1f6630c24ba3d2441
[INFO] testing pepyakin/substrate-contracts-adder against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpepyakin%2Fsubstrate-contracts-adder" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/pepyakin/substrate-contracts-adder on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/pepyakin/substrate-contracts-adder
[INFO] finished tweaking git repo https://github.com/pepyakin/substrate-contracts-adder
[INFO] tweaked toml for git repo https://github.com/pepyakin/substrate-contracts-adder written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/pepyakin/substrate-contracts-adder already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "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 `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 72b7e60fee55540cbcd1e7b25d9f9a7fbf28948d01ea093a458b9e838061bfed
[INFO] running `"docker" "start" "-a" "72b7e60fee55540cbcd1e7b25d9f9a7fbf28948d01ea093a458b9e838061bfed"`
[INFO] [stderr]    Compiling wee_alloc v0.4.2
[INFO] [stderr]    Compiling libc v0.2.43
[INFO] [stderr]    Compiling memory_units v0.4.0
[INFO] [stderr]    Compiling parity-codec v2.0.3
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/parity-codec-2.0.3/src/lib.rs:20:35
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![cfg_attr(not(feature = "std"), feature(alloc))]
[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 `parity-codec`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "72b7e60fee55540cbcd1e7b25d9f9a7fbf28948d01ea093a458b9e838061bfed"`
[INFO] running `"docker" "rm" "-f" "72b7e60fee55540cbcd1e7b25d9f9a7fbf28948d01ea093a458b9e838061bfed"`
[INFO] [stdout] 72b7e60fee55540cbcd1e7b25d9f9a7fbf28948d01ea093a458b9e838061bfed