[INFO] crate a3mo_lib 0.3.0 is already in cache
[INFO] testing a3mo_lib-0.3.0 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate a3mo_lib 0.3.0 into work/builds/worker-3/source
[INFO] validating manifest of crates.io crate a3mo_lib 0.3.0 on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate a3mo_lib 0.3.0
[INFO] finished tweaking crates.io crate a3mo_lib 0.3.0
[INFO] tweaked toml for crates.io crate a3mo_lib 0.3.0 written to work/builds/worker-3/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 7626d1adf5a69aaf1c02b6a8c7260d6eba9e9f0656f13a8388e90eb0a1a69862
[INFO] running `"docker" "start" "-a" "7626d1adf5a69aaf1c02b6a8c7260d6eba9e9f0656f13a8388e90eb0a1a69862"`
[INFO] [stderr]    Compiling custom_error v1.7.1
[INFO] [stderr]    Compiling faster-hex v0.3.1
[INFO] [stderr]    Compiling libsqlite3-sys v0.16.0
[INFO] [stderr]    Compiling rustc-test v0.3.0
[INFO] [stderr]    Compiling xorshift v0.1.3
[INFO] [stderr]    Compiling indextree v4.0.0
[INFO] [stderr]    Compiling delta_patch v0.1.0
[INFO] [stderr]    Compiling easy_xxhash64 v1.1.6
[INFO] [stderr]    Compiling rusqlite v0.20.0
[INFO] [stderr]    Compiling a3mo_lib v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(core_intrinsics)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(type_ascription)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(seek_convenience)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `a3mo_lib`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7626d1adf5a69aaf1c02b6a8c7260d6eba9e9f0656f13a8388e90eb0a1a69862"`
[INFO] running `"docker" "rm" "-f" "7626d1adf5a69aaf1c02b6a8c7260d6eba9e9f0656f13a8388e90eb0a1a69862"`
[INFO] [stdout] 7626d1adf5a69aaf1c02b6a8c7260d6eba9e9f0656f13a8388e90eb0a1a69862