[INFO] updating cached repository quininer/fast-swapview
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/quininer/fast-swapview
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/quininer/fast-swapview" "work/ex/beta-1.38-1/sources/1.37.0/gh/quininer/fast-swapview"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/quininer/fast-swapview'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/quininer/fast-swapview" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/quininer/fast-swapview"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/quininer/fast-swapview'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a0110fb2b96301cd9cbc21ac8bd6cd75222c81c1
[INFO] sha for GitHub repo quininer/fast-swapview: a0110fb2b96301cd9cbc21ac8bd6cd75222c81c1
[INFO] validating manifest of quininer/fast-swapview 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 quininer/fast-swapview 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 quininer/fast-swapview
[INFO] finished frobbing quininer/fast-swapview
[INFO] frobbed toml for quininer/fast-swapview written to work/ex/beta-1.38-1/sources/1.37.0/gh/quininer/fast-swapview/Cargo.toml
[INFO] started frobbing quininer/fast-swapview
[INFO] finished frobbing quininer/fast-swapview
[INFO] frobbed toml for quininer/fast-swapview written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/quininer/fast-swapview/Cargo.toml
[INFO] crate quininer/fast-swapview 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 quininer/fast-swapview 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/quininer/fast-swapview:/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] 20d38d0987d186cb73c267e52e20bcea7e783b3fdef8ccb3cb0a19727bc39d3e
[INFO] running `"docker" "start" "-a" "20d38d0987d186cb73c267e52e20bcea7e783b3fdef8ccb3cb0a19727bc39d3e"`
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling static_assertions v0.2.5
[INFO] [stderr]    Compiling fast-floats v0.1.1
[INFO] [stderr]    Compiling nom v5.0.0
[INFO] [stderr]    Compiling stackvector v1.0.6
[INFO] [stderr]    Compiling lexical-core v0.4.2
[INFO] [stderr]    Compiling regex-automata v0.1.7
[INFO] [stderr]    Compiling crossbeam-deque v0.6.3
[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/fast-floats-0.1.1/src/lib.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | #![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 `fast-floats`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "20d38d0987d186cb73c267e52e20bcea7e783b3fdef8ccb3cb0a19727bc39d3e"`
[INFO] running `"docker" "rm" "-f" "20d38d0987d186cb73c267e52e20bcea7e783b3fdef8ccb3cb0a19727bc39d3e"`
[INFO] [stdout] 20d38d0987d186cb73c267e52e20bcea7e783b3fdef8ccb3cb0a19727bc39d3e