[INFO] updating cached repository jethrosun/silver-octo-spoon
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jethrosun/silver-octo-spoon
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jethrosun/silver-octo-spoon" "work/ex/beta-1.38-1/sources/1.37.0/gh/jethrosun/silver-octo-spoon"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jethrosun/silver-octo-spoon'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jethrosun/silver-octo-spoon" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jethrosun/silver-octo-spoon"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jethrosun/silver-octo-spoon'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5c128bc6d08c13bf0beb946c6a7690a845b1399b
[INFO] sha for GitHub repo jethrosun/silver-octo-spoon: 5c128bc6d08c13bf0beb946c6a7690a845b1399b
[INFO] validating manifest of jethrosun/silver-octo-spoon 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 jethrosun/silver-octo-spoon 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 jethrosun/silver-octo-spoon
[INFO] finished frobbing jethrosun/silver-octo-spoon
[INFO] frobbed toml for jethrosun/silver-octo-spoon written to work/ex/beta-1.38-1/sources/1.37.0/gh/jethrosun/silver-octo-spoon/Cargo.toml
[INFO] started frobbing jethrosun/silver-octo-spoon
[INFO] finished frobbing jethrosun/silver-octo-spoon
[INFO] frobbed toml for jethrosun/silver-octo-spoon written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jethrosun/silver-octo-spoon/Cargo.toml
[INFO] crate jethrosun/silver-octo-spoon 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 jethrosun/silver-octo-spoon 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-2/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/jethrosun/silver-octo-spoon:/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] 35e2601b9e80f12f02d83c54e7e9dda74e789e2ebd5d28cdb2a764a478e43b33
[INFO] running `"docker" "start" "-a" "35e2601b9e80f12f02d83c54e7e9dda74e789e2ebd5d28cdb2a764a478e43b33"`
[INFO] [stderr]    Compiling managed v0.7.1
[INFO] [stderr]    Compiling ring v0.14.6
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling nom v4.0.0
[INFO] [stderr]    Compiling pcap v0.7.0
[INFO] [stderr]    Compiling syn v0.15.33
[INFO] [stderr]    Compiling etherparse v0.8.0
[INFO] [stderr]    Compiling backtrace v0.3.15
[INFO] [stderr]    Compiling smoltcp v0.5.0
[INFO] [stderr]    Compiling error-chain v0.11.0
[INFO] [stderr]    Compiling error-chain v0.12.0
[INFO] [stderr]    Compiling pcap-file v0.10.0
[INFO] [stderr]    Compiling net-parser-rs v0.1.1
[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/net-parser-rs-0.1.1/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(test, try_from)]
[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 `net-parser-rs`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning[E0713]: borrow may still be in use when destructor runs
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/smoltcp-0.5.0/src/socket/ref_.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 39 | impl<'a, T: Session + 'a> Ref<'a, T> {
[INFO] [stderr]    |      -- lifetime `'a` defined here
[INFO] [stderr] ...
[INFO] [stderr] 61 |         ref_.socket
[INFO] [stderr]    |         ^^^^^^^^^^^ returning this value requires that `*ref_.socket` is borrowed for `'a`
[INFO] [stderr] 62 |     }
[INFO] [stderr]    |     - here, drop of `ref_` needs exclusive access to `*ref_.socket`, because the type `socket::ref_::Ref<'_, T>` implements the `Drop` trait
[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] error: build failed
[INFO] running `"docker" "inspect" "35e2601b9e80f12f02d83c54e7e9dda74e789e2ebd5d28cdb2a764a478e43b33"`
[INFO] running `"docker" "rm" "-f" "35e2601b9e80f12f02d83c54e7e9dda74e789e2ebd5d28cdb2a764a478e43b33"`
[INFO] [stdout] 35e2601b9e80f12f02d83c54e7e9dda74e789e2ebd5d28cdb2a764a478e43b33