Dec 13 14:54:27.536 INFO testing jswrenn/basicb against master#bd47d6825bf4090517549d33cfef10d3300b4a75 for pr-56550
Dec 13 14:54:27.536 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-1/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56550/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +bd47d6825bf4090517549d33cfef10d3300b4a75-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 13 14:54:28.017 INFO [stdout] cac2a5d7271f71bbb97679dcf9956e2eed1bc68662f683b9674bc7028afac155
Dec 13 14:54:28.020 INFO running `"docker" "start" "-a" "cac2a5d7271f71bbb97679dcf9956e2eed1bc68662f683b9674bc7028afac155"`
Dec 13 14:54:29.755 INFO [stderr] usermod: no changes
Dec 13 14:54:29.931 INFO [stderr]    Compiling dimensioned v0.6.0
Dec 13 14:54:29.935 INFO [stderr]    Compiling generic-array v0.5.1
Dec 13 14:54:29.935 INFO [stderr]    Compiling structopt-derive v0.2.6
Dec 13 14:54:34.479 INFO [stderr]    Compiling structopt v0.2.6
Dec 13 14:54:41.928 INFO [stderr]    Compiling beep v0.2.0
Dec 13 14:54:42.314 INFO [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? (see issue #27812)
Dec 13 14:54:42.314 INFO [stderr]  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/beep-0.2.0/src/lib.rs:2:1
Dec 13 14:54:42.314 INFO [stderr]   |
Dec 13 14:54:42.314 INFO [stderr] 2 | extern crate libc;
Dec 13 14:54:42.314 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 13 14:54:42.314 INFO [stderr]   |
Dec 13 14:54:42.314 INFO [stderr]   = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 13 14:54:42.314 INFO [stderr] 
Dec 13 14:54:42.314 INFO [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? (see issue #27812)
Dec 13 14:54:42.314 INFO [stderr]  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/beep-0.2.0/src/lib.rs:8:5
Dec 13 14:54:42.314 INFO [stderr]   |
Dec 13 14:54:42.314 INFO [stderr] 8 | use libc::ioctl;
Dec 13 14:54:42.314 INFO [stderr]   |     ^^^^^^^^^^^
Dec 13 14:54:42.314 INFO [stderr]   |
Dec 13 14:54:42.314 INFO [stderr]   = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 13 14:54:42.314 INFO [stderr] 
Dec 13 14:54:42.314 INFO [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead? (see issue #27812)
Dec 13 14:54:42.314 INFO [stderr]   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/beep-0.2.0/src/lib.rs:53:5
Dec 13 14:54:42.314 INFO [stderr]    |
Dec 13 14:54:42.314 INFO [stderr] 53 |     ioctl(DEVICE.as_raw_fd(), KIOCSOUND,
Dec 13 14:54:42.314 INFO [stderr]    |     ^^^^^
Dec 13 14:54:42.314 INFO [stderr]    |
Dec 13 14:54:42.314 INFO [stderr]    = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 13 14:54:42.314 INFO [stderr] 
Dec 13 14:54:42.343 INFO [stderr] error: aborting due to 3 previous errors
Dec 13 14:54:42.343 INFO [stderr] 
Dec 13 14:54:42.343 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 13 14:54:42.351 INFO [stderr] error: Could not compile `beep`.
Dec 13 14:54:42.351 INFO [stderr] 
Dec 13 14:54:42.351 INFO [stderr] To learn more, run the command again with --verbose.
Dec 13 14:54:42.353 INFO [stderr] su: No module specific data is present
Dec 13 14:54:42.984 INFO running `"docker" "inspect" "cac2a5d7271f71bbb97679dcf9956e2eed1bc68662f683b9674bc7028afac155"`
Dec 13 14:54:43.213 INFO running `"docker" "rm" "-f" "cac2a5d7271f71bbb97679dcf9956e2eed1bc68662f683b9674bc7028afac155"`
Dec 13 14:54:43.534 INFO [stdout] cac2a5d7271f71bbb97679dcf9956e2eed1bc68662f683b9674bc7028afac155