[INFO] updating cached repository dyxushuai/mum
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dyxushuai/mum
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dyxushuai/mum" "work/ex/beta-1.37-6/sources/1.36.0/gh/dyxushuai/mum"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/dyxushuai/mum'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dyxushuai/mum" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dyxushuai/mum"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dyxushuai/mum'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9eb1c3fd1d1b029bd62f78f5bd51171d5126190b
[INFO] sha for GitHub repo dyxushuai/mum: 9eb1c3fd1d1b029bd62f78f5bd51171d5126190b
[INFO] validating manifest of dyxushuai/mum on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of dyxushuai/mum on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing dyxushuai/mum
[INFO] finished frobbing dyxushuai/mum
[INFO] frobbed toml for dyxushuai/mum written to work/ex/beta-1.37-6/sources/1.36.0/gh/dyxushuai/mum/Cargo.toml
[INFO] started frobbing dyxushuai/mum
[INFO] finished frobbing dyxushuai/mum
[INFO] frobbed toml for dyxushuai/mum written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dyxushuai/mum/Cargo.toml
[INFO] crate dyxushuai/mum already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing dyxushuai/mum against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/dyxushuai/mum:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] d1670f0d70da8630f0e89f8dc88ca853eca2541037962519ae65c6aebebb72fd
[INFO] running `"docker" "start" "-a" "d1670f0d70da8630f0e89f8dc88ca853eca2541037962519ae65c6aebebb72fd"`
[INFO] [stderr]    Compiling protobuf v1.7.3
[INFO] [stderr]    Compiling spin v0.4.8
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling cmake v0.1.31
[INFO] [stderr]    Compiling protoc v2.0.2
[INFO] [stderr]    Compiling procinfo v0.3.1
[INFO] [stderr]    Compiling protobuf-codegen v2.0.2
[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/spin-0.4.8/src/lib.rs:6:30
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![cfg_attr(feature = "asm", feature(asm))]
[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/spin-0.4.8/src/lib.rs:7:42
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![cfg_attr(feature = "core_intrinsics", feature(core_intrinsics))]
[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/spin-0.4.8/src/lib.rs:8:35
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![cfg_attr(feature = "const_fn", feature(const_fn, const_unsafe_cell_new, const_atomic_usize_new))]
[INFO] [stderr]   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `spin`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d1670f0d70da8630f0e89f8dc88ca853eca2541037962519ae65c6aebebb72fd"`
[INFO] running `"docker" "rm" "-f" "d1670f0d70da8630f0e89f8dc88ca853eca2541037962519ae65c6aebebb72fd"`
[INFO] [stdout] d1670f0d70da8630f0e89f8dc88ca853eca2541037962519ae65c6aebebb72fd