[INFO] updating cached repository rrichardson/block_alloc
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rrichardson/block_alloc
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rrichardson/block_alloc" "work/ex/beta-1.38-1/sources/1.37.0/gh/rrichardson/block_alloc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/rrichardson/block_alloc'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rrichardson/block_alloc" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rrichardson/block_alloc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rrichardson/block_alloc'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9703709bc0e5392472a86d47ec34ecd54f993482
[INFO] sha for GitHub repo rrichardson/block_alloc: 9703709bc0e5392472a86d47ec34ecd54f993482
[INFO] validating manifest of rrichardson/block_alloc 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 rrichardson/block_alloc 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 rrichardson/block_alloc
[INFO] finished frobbing rrichardson/block_alloc
[INFO] frobbed toml for rrichardson/block_alloc written to work/ex/beta-1.38-1/sources/1.37.0/gh/rrichardson/block_alloc/Cargo.toml
[INFO] started frobbing rrichardson/block_alloc
[INFO] finished frobbing rrichardson/block_alloc
[INFO] frobbed toml for rrichardson/block_alloc written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rrichardson/block_alloc/Cargo.toml
[INFO] crate rrichardson/block_alloc 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rrichardson/block_alloc 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/rrichardson/block_alloc:/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] 32231f67bacd53006f2860fdb44140e7f1cfc224d76a91d1c95e91e9e4dcd9d1
[INFO] running `"docker" "start" "-a" "32231f67bacd53006f2860fdb44140e7f1cfc224d76a91d1c95e91e9e4dcd9d1"`
[INFO] [stderr]    Compiling libc v0.2.33
[INFO] [stderr]    Compiling memmap v0.6.0
[INFO] [stderr]    Compiling block_allocator v0.2.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | #![feature(test)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:16:1
[INFO] [stderr]    |
[INFO] [stderr] 16 | #![feature(integer_atomics)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/block_allocator.rs:250:32
[INFO] [stderr]     |
[INFO] [stderr] 250 |     fn cause(&self) -> Option<&Error> { 
[INFO] [stderr]     |                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[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 `block_allocator`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "32231f67bacd53006f2860fdb44140e7f1cfc224d76a91d1c95e91e9e4dcd9d1"`
[INFO] running `"docker" "rm" "-f" "32231f67bacd53006f2860fdb44140e7f1cfc224d76a91d1c95e91e9e4dcd9d1"`
[INFO] [stdout] 32231f67bacd53006f2860fdb44140e7f1cfc224d76a91d1c95e91e9e4dcd9d1