[INFO] updating cached repository void4/rarust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/void4/rarust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/void4/rarust" "work/ex/beta-1.38-1/sources/1.37.0/gh/void4/rarust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/void4/rarust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/void4/rarust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/void4/rarust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/void4/rarust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b8062f7203d8c8168ae2763ebebe7fcb326c8a89
[INFO] sha for GitHub repo void4/rarust: b8062f7203d8c8168ae2763ebebe7fcb326c8a89
[INFO] validating manifest of void4/rarust 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 void4/rarust 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 void4/rarust
[INFO] finished frobbing void4/rarust
[INFO] frobbed toml for void4/rarust written to work/ex/beta-1.38-1/sources/1.37.0/gh/void4/rarust/Cargo.toml
[INFO] started frobbing void4/rarust
[INFO] finished frobbing void4/rarust
[INFO] frobbed toml for void4/rarust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/void4/rarust/Cargo.toml
[INFO] crate void4/rarust 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 void4/rarust 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/void4/rarust:/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] 82ddd94a83e5a9d55a15a24d52dec1b531a9a0e7c257381cd88f7aff8c23d42f
[INFO] running `"docker" "start" "-a" "82ddd94a83e5a9d55a15a24d52dec1b531a9a0e7c257381cd88f7aff8c23d42f"`
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling rvm v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(nll)]
[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 `rvm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "82ddd94a83e5a9d55a15a24d52dec1b531a9a0e7c257381cd88f7aff8c23d42f"`
[INFO] running `"docker" "rm" "-f" "82ddd94a83e5a9d55a15a24d52dec1b531a9a0e7c257381cd88f7aff8c23d42f"`
[INFO] [stdout] 82ddd94a83e5a9d55a15a24d52dec1b531a9a0e7c257381cd88f7aff8c23d42f