Dec 19 14:52:26.441 INFO checking jswrenn/basicb against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 14:52:26.441 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-3/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/jswrenn/basicb:/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=forbid" "-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" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 14:52:26.919 INFO [stdout] 7f646c218487de2590b9ae84580c5230bd5aaf34e581183d14e5974c3459e4c7
Dec 19 14:52:26.921 INFO running `"docker" "start" "-a" "7f646c218487de2590b9ae84580c5230bd5aaf34e581183d14e5974c3459e4c7"`
Dec 19 14:52:28.520 INFO [stderr]    Compiling dimensioned v0.6.0
Dec 19 14:52:28.520 INFO [stderr]     Checking generic-array v0.5.1
Dec 19 14:52:28.520 INFO [stderr]    Compiling structopt-derive v0.2.6
Dec 19 14:52:33.765 INFO [stderr]     Checking structopt v0.2.6
Dec 19 14:52:40.542 INFO [stderr]     Checking beep v0.2.0
Dec 19 14:52:40.788 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 19 14:52:40.789 INFO [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/beep-0.2.0/src/lib.rs:2:1
Dec 19 14:52:40.789 INFO [stderr]   |
Dec 19 14:52:40.789 INFO [stderr] 2 | extern crate libc;
Dec 19 14:52:40.789 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 19 14:52:40.789 INFO [stderr]   |
Dec 19 14:52:40.789 INFO [stderr]   = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 19 14:52:40.789 INFO [stderr] 
Dec 19 14:52:40.789 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 19 14:52:40.789 INFO [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/beep-0.2.0/src/lib.rs:8:5
Dec 19 14:52:40.789 INFO [stderr]   |
Dec 19 14:52:40.789 INFO [stderr] 8 | use libc::ioctl;
Dec 19 14:52:40.789 INFO [stderr]   |     ^^^^^^^^^^^
Dec 19 14:52:40.789 INFO [stderr]   |
Dec 19 14:52:40.789 INFO [stderr]   = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 19 14:52:40.789 INFO [stderr] 
Dec 19 14:52:40.789 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 19 14:52:40.789 INFO [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/beep-0.2.0/src/lib.rs:53:5
Dec 19 14:52:40.789 INFO [stderr]    |
Dec 19 14:52:40.789 INFO [stderr] 53 |     ioctl(DEVICE.as_raw_fd(), KIOCSOUND,
Dec 19 14:52:40.789 INFO [stderr]    |     ^^^^^
Dec 19 14:52:40.789 INFO [stderr]    |
Dec 19 14:52:40.789 INFO [stderr]    = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 19 14:52:40.789 INFO [stderr] 
Dec 19 14:52:40.816 INFO [stderr] error: aborting due to 3 previous errors
Dec 19 14:52:40.816 INFO [stderr] 
Dec 19 14:52:40.816 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 19 14:52:40.829 INFO [stderr] error: Could not compile `beep`.
Dec 19 14:52:40.829 INFO [stderr] 
Dec 19 14:52:40.829 INFO [stderr] To learn more, run the command again with --verbose.
Dec 19 14:52:41.422 INFO running `"docker" "inspect" "7f646c218487de2590b9ae84580c5230bd5aaf34e581183d14e5974c3459e4c7"`
Dec 19 14:52:41.714 INFO running `"docker" "rm" "-f" "7f646c218487de2590b9ae84580c5230bd5aaf34e581183d14e5974c3459e4c7"`
Dec 19 14:52:42.140 INFO [stdout] 7f646c218487de2590b9ae84580c5230bd5aaf34e581183d14e5974c3459e4c7