[INFO] updating cached repository redox-os/installer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/redox-os/installer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/redox-os/installer" "work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/installer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/installer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/redox-os/installer" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/installer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/installer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b75b1c2f8683d78598a832b5239410d8a37005dd
[INFO] sha for GitHub repo redox-os/installer: b75b1c2f8683d78598a832b5239410d8a37005dd
[INFO] validating manifest of redox-os/installer 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 redox-os/installer 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 redox-os/installer
[INFO] finished frobbing redox-os/installer
[INFO] frobbed toml for redox-os/installer written to work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/installer/Cargo.toml
[INFO] started frobbing redox-os/installer
[INFO] finished frobbing redox-os/installer
[INFO] frobbed toml for redox-os/installer written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/installer/Cargo.toml
[INFO] crate redox-os/installer 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 redox-os/installer 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/installer:/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] 861ea7ff9165cf5cab368164f12e7b377d5fd886527da643a7c6ea6b94d8776b
[INFO] running `"docker" "start" "-a" "861ea7ff9165cf5cab368164f12e7b377d5fd886527da643a7c6ea6b94d8776b"`
[INFO] [stderr]    Compiling syn v0.15.35
[INFO] [stderr]    Compiling numtoa v0.1.0
[INFO] [stderr]    Compiling thread-scoped v1.0.2
[INFO] [stderr]    Compiling redox_pkgutils v0.1.2
[INFO] [stderr]    Compiling bytecount v0.1.7
[INFO] [stderr]    Compiling redox_syscall v0.1.54
[INFO] [stderr]    Compiling version-compare v0.0.4
[INFO] [stderr]    Compiling bidir-map v0.6.0
[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/redox_syscall-0.1.54/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![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/redox_syscall-0.1.54/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling arg_parser v0.1.0
[INFO] [stderr] warning[E0621]: explicit lifetime required in the type of `other`
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/version-compare-0.0.4/src/version.rs:308:13
[INFO] [stderr]     |
[INFO] [stderr] 304 |     pub fn compare(&self, other: &Version) -> CompOp {
[INFO] [stderr]     |                                  -------- help: add explicit lifetime `'a` to the type of `other`: `&version::Version<'a>`
[INFO] [stderr] ...
[INFO] [stderr] 308 |             other.parts.iter().peekable()
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lifetime `'a` required
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]     = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]     = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]    Compiling ring v0.13.5
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `redox_syscall`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "861ea7ff9165cf5cab368164f12e7b377d5fd886527da643a7c6ea6b94d8776b"`
[INFO] running `"docker" "rm" "-f" "861ea7ff9165cf5cab368164f12e7b377d5fd886527da643a7c6ea6b94d8776b"`
[INFO] [stdout] 861ea7ff9165cf5cab368164f12e7b377d5fd886527da643a7c6ea6b94d8776b