[INFO] updating cached repository michaelmelanson/risp
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/michaelmelanson/risp
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/michaelmelanson/risp" "work/ex/beta-1.38-1/sources/1.37.0/gh/michaelmelanson/risp"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/michaelmelanson/risp'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/michaelmelanson/risp" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelmelanson/risp"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelmelanson/risp'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 23351fdd9980e7de56492c657edf2e8f804a4ce3
[INFO] sha for GitHub repo michaelmelanson/risp: 23351fdd9980e7de56492c657edf2e8f804a4ce3
[INFO] validating manifest of michaelmelanson/risp 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/risp 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/risp
[INFO] finished frobbing michaelmelanson/risp
[INFO] frobbed toml for michaelmelanson/risp written to work/ex/beta-1.38-1/sources/1.37.0/gh/michaelmelanson/risp/Cargo.toml
[INFO] started frobbing michaelmelanson/risp
[INFO] finished frobbing michaelmelanson/risp
[INFO] frobbed toml for michaelmelanson/risp written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/michaelmelanson/risp/Cargo.toml
[INFO] crate michaelmelanson/risp 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing michaelmelanson/risp 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/michaelmelanson/risp:/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] b277162611c4e3e51284df43eabab3df5d04a96aafbbc1151db589668dcd7652
[INFO] running `"docker" "start" "-a" "b277162611c4e3e51284df43eabab3df5d04a96aafbbc1151db589668dcd7652"`
[INFO] [stderr]    Compiling likely v0.1.0
[INFO] [stderr]    Compiling nom v5.0.0
[INFO] [stderr]    Compiling lexical-core v0.4.1
[INFO] [stderr]    Compiling stackvector v1.0.6
[INFO] [stderr]    Compiling rustyline v5.0.0
[INFO] [stderr]    Compiling assembler v0.10.1
[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/assembler-0.10.1/src/lib.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(core_intrinsics)]
[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 `assembler`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b277162611c4e3e51284df43eabab3df5d04a96aafbbc1151db589668dcd7652"`
[INFO] running `"docker" "rm" "-f" "b277162611c4e3e51284df43eabab3df5d04a96aafbbc1151db589668dcd7652"`
[INFO] [stdout] b277162611c4e3e51284df43eabab3df5d04a96aafbbc1151db589668dcd7652