[INFO] crate tt-num 0.1.0 is already in cache
[INFO] testing tt-num-0.1.0 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate tt-num 0.1.0 into work/builds/worker-1/source
[INFO] validating manifest of crates.io crate tt-num 0.1.0 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 tt-num 0.1.0
[INFO] finished tweaking crates.io crate tt-num 0.1.0
[INFO] tweaked toml for crates.io crate tt-num 0.1.0 written to work/builds/worker-1/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-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/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] b6e9a5152e8b49c947218c6803b2358fdb0d54195e831006966adf8af26aeb42
[INFO] running `"docker" "start" "-a" "b6e9a5152e8b49c947218c6803b2358fdb0d54195e831006966adf8af26aeb42"`
[INFO] [stderr]    Compiling tt-call v1.0.6
[INFO] [stderr]    Compiling tt-num v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `"docker" "inspect" "b6e9a5152e8b49c947218c6803b2358fdb0d54195e831006966adf8af26aeb42"`
[INFO] running `"docker" "rm" "-f" "b6e9a5152e8b49c947218c6803b2358fdb0d54195e831006966adf8af26aeb42"`
[INFO] [stdout] b6e9a5152e8b49c947218c6803b2358fdb0d54195e831006966adf8af26aeb42
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 6eafa1e8535d30a6507292b43fb53218ffb3991c7a22e3f29b6e5c47990c9f4b
[INFO] running `"docker" "start" "-a" "6eafa1e8535d30a6507292b43fb53218ffb3991c7a22e3f29b6e5c47990c9f4b"`
[INFO] [stderr]    Compiling tt-num v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> examples/times.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(use_extern_macros)]
[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 `tt-num`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "6eafa1e8535d30a6507292b43fb53218ffb3991c7a22e3f29b6e5c47990c9f4b"`
[INFO] running `"docker" "rm" "-f" "6eafa1e8535d30a6507292b43fb53218ffb3991c7a22e3f29b6e5c47990c9f4b"`
[INFO] [stdout] 6eafa1e8535d30a6507292b43fb53218ffb3991c7a22e3f29b6e5c47990c9f4b