[INFO] updating cached repository michaelmelanson/wasm-kernel
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/michaelmelanson/wasm-kernel
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/michaelmelanson/wasm-kernel" "work/ex/beta-1.38-1/sources/1.37.0/gh/michaelmelanson/wasm-kernel"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/michaelmelanson/wasm-kernel'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/michaelmelanson/wasm-kernel" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelmelanson/wasm-kernel"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelmelanson/wasm-kernel'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fe497a1d55cf5915492ed3bf5b8b1b1b00f1f97d
[INFO] sha for GitHub repo michaelmelanson/wasm-kernel: fe497a1d55cf5915492ed3bf5b8b1b1b00f1f97d
[INFO] validating manifest of michaelmelanson/wasm-kernel 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 michaelmelanson/wasm-kernel 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 michaelmelanson/wasm-kernel
[INFO] finished frobbing michaelmelanson/wasm-kernel
[INFO] frobbed toml for michaelmelanson/wasm-kernel written to work/ex/beta-1.38-1/sources/1.37.0/gh/michaelmelanson/wasm-kernel/Cargo.toml
[INFO] started frobbing michaelmelanson/wasm-kernel
[INFO] finished frobbing michaelmelanson/wasm-kernel
[INFO] frobbed toml for michaelmelanson/wasm-kernel written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelmelanson/wasm-kernel/Cargo.toml
[INFO] crate michaelmelanson/wasm-kernel 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 michaelmelanson/wasm-kernel against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelmelanson/wasm-kernel:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] b66146242daefd8acbe1d486cba36ce02a5a624d96635e5446951897f170fcc4
[INFO] running `"docker" "start" "-a" "b66146242daefd8acbe1d486cba36ce02a5a624d96635e5446951897f170fcc4"`
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling usize_conversions v0.2.0
[INFO] [stderr]    Compiling memory_units v0.3.0
[INFO] [stderr]    Compiling parity-wasm v0.31.3
[INFO] [stderr]    Compiling hashbrown v0.1.8
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/usize_conversions-0.2.0/src/lib.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(i128_type)]
[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 `usize_conversions`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/parity-wasm-0.31.3/src/lib.rs:4:35
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![cfg_attr(not(feature = "std"), feature(alloc))]
[INFO] [stderr]   |                                   ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.1.8/src/lib.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | /     feature(
[INFO] [stderr] 16 | |         alloc,
[INFO] [stderr] 17 | |         alloc_layout_extra,
[INFO] [stderr] 18 | |         allocator_api,
[INFO] [stderr] ...  |
[INFO] [stderr] 22 | |         dropck_eyepatch
[INFO] [stderr] 23 | |     )
[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 `hashbrown`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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-wasm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b66146242daefd8acbe1d486cba36ce02a5a624d96635e5446951897f170fcc4"`
[INFO] running `"docker" "rm" "-f" "b66146242daefd8acbe1d486cba36ce02a5a624d96635e5446951897f170fcc4"`
[INFO] [stdout] b66146242daefd8acbe1d486cba36ce02a5a624d96635e5446951897f170fcc4