[INFO] updating cached repository xlnx/loa-frontend
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/xlnx/loa-frontend
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/xlnx/loa-frontend" "work/ex/beta-1.38-1/sources/1.37.0/gh/xlnx/loa-frontend"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/xlnx/loa-frontend'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/xlnx/loa-frontend" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/xlnx/loa-frontend"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/xlnx/loa-frontend'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d4473ecf6396e6fbfde6a8489794f5e60087982c
[INFO] sha for GitHub repo xlnx/loa-frontend: d4473ecf6396e6fbfde6a8489794f5e60087982c
[INFO] validating manifest of xlnx/loa-frontend 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 xlnx/loa-frontend 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 xlnx/loa-frontend
[INFO] finished frobbing xlnx/loa-frontend
[INFO] frobbed toml for xlnx/loa-frontend written to work/ex/beta-1.38-1/sources/1.37.0/gh/xlnx/loa-frontend/Cargo.toml
[INFO] started frobbing xlnx/loa-frontend
[INFO] finished frobbing xlnx/loa-frontend
[INFO] frobbed toml for xlnx/loa-frontend written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/xlnx/loa-frontend/Cargo.toml
[INFO] crate xlnx/loa-frontend 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing xlnx/loa-frontend 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/xlnx/loa-frontend:/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] 1b1a599bbb6a54732583171b340367537c9061599ae25db13d021acc166c0693
[INFO] running `"docker" "start" "-a" "1b1a599bbb6a54732583171b340367537c9061599ae25db13d021acc166c0693"`
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.42
[INFO] [stderr]    Compiling syn v0.15.31
[INFO] [stderr]    Compiling bumpalo v2.3.0
[INFO] [stderr]    Compiling wasm-bindgen v0.2.42
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.42
[INFO] [stderr]    Compiling serde_derive v1.0.90
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.42
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.42
[INFO] [stderr]    Compiling wbg-rand v0.4.1
[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/wbg-rand-0.4.1/src/lib.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #![feature(use_extern_macros)]
[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 `wbg-rand`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1b1a599bbb6a54732583171b340367537c9061599ae25db13d021acc166c0693"`
[INFO] running `"docker" "rm" "-f" "1b1a599bbb6a54732583171b340367537c9061599ae25db13d021acc166c0693"`
[INFO] [stdout] 1b1a599bbb6a54732583171b340367537c9061599ae25db13d021acc166c0693