Dec 18 17:26:42.078 INFO checking combinatorics-0.0.1 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 17:26:42.078 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-4/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/reg/combinatorics/0.0.1:/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 17:26:42.325 INFO [stdout] 9119fde8b014eed00d0e7aadd0882e0df201d8b9ab78b17fbb8a83c8287ffbd7
Dec 18 17:26:42.330 INFO running `"docker" "start" "-a" "9119fde8b014eed00d0e7aadd0882e0df201d8b9ab78b17fbb8a83c8287ffbd7"`
Dec 18 17:26:43.048 INFO [stderr]     Checking combinatorics v0.0.1 (/opt/crater/workdir)
Dec 18 17:26:43.320 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 18 17:26:43.320 INFO [stderr]   --> src/lib.rs:29:1
Dec 18 17:26:43.320 INFO [stderr]    |
Dec 18 17:26:43.320 INFO [stderr] 29 | extern crate libc;
Dec 18 17:26:43.320 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^
Dec 18 17:26:43.320 INFO [stderr]    |
Dec 18 17:26:43.320 INFO [stderr]    = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 18 17:26:43.320 INFO [stderr] 
Dec 18 17:26:43.336 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 18 17:26:43.336 INFO [stderr]   --> src/lib.rs:29:1
Dec 18 17:26:43.336 INFO [stderr]    |
Dec 18 17:26:43.336 INFO [stderr] 29 | extern crate libc;
Dec 18 17:26:43.336 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^
Dec 18 17:26:43.336 INFO [stderr]    |
Dec 18 17:26:43.336 INFO [stderr]    = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 18 17:26:43.336 INFO [stderr] 
Dec 18 17:26:43.352 INFO [stderr] error: aborting due to previous error
Dec 18 17:26:43.352 INFO [stderr] 
Dec 18 17:26:43.352 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 18 17:26:43.358 INFO [stderr] error: Could not compile `combinatorics`.
Dec 18 17:26:43.359 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 17:26:43.359 INFO [stderr] error: aborting due to previous error
Dec 18 17:26:43.359 INFO [stderr] 
Dec 18 17:26:43.359 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 18 17:26:43.371 INFO [stderr] error: Could not compile `combinatorics`.
Dec 18 17:26:43.371 INFO [stderr] 
Dec 18 17:26:43.371 INFO [stderr] To learn more, run the command again with --verbose.
Dec 18 17:26:44.127 INFO running `"docker" "inspect" "9119fde8b014eed00d0e7aadd0882e0df201d8b9ab78b17fbb8a83c8287ffbd7"`
Dec 18 17:26:44.245 INFO running `"docker" "rm" "-f" "9119fde8b014eed00d0e7aadd0882e0df201d8b9ab78b17fbb8a83c8287ffbd7"`
Dec 18 17:26:44.425 INFO [stdout] 9119fde8b014eed00d0e7aadd0882e0df201d8b9ab78b17fbb8a83c8287ffbd7