Dec 15 18:28:33.909 INFO testing combinatorics-0.0.1 against master#bd47d6825bf4090517549d33cfef10d3300b4a75 for pr-56550
Dec 15 18:28:33.910 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-2/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/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 15 18:28:34.089 INFO [stdout] 2cd9cd2333b0ae994c18d0b2ba41226cf6ecb18baca1a067235b94cebd650040
Dec 15 18:28:34.091 INFO running `"docker" "start" "-a" "2cd9cd2333b0ae994c18d0b2ba41226cf6ecb18baca1a067235b94cebd650040"`
Dec 15 18:28:34.544 INFO [stderr] usermod: no changes
Dec 15 18:28:34.578 INFO [stderr]    Compiling combinatorics v0.0.1 (/source)
Dec 15 18:28:35.109 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 15 18:28:35.115 INFO [stderr]   --> src/lib.rs:29:1
Dec 15 18:28:35.115 INFO [stderr]    |
Dec 15 18:28:35.115 INFO [stderr] 29 | extern crate libc;
Dec 15 18:28:35.115 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^
Dec 15 18:28:35.116 INFO [stderr]    |
Dec 15 18:28:35.116 INFO [stderr]    = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 15 18:28:35.116 INFO [stderr] 
Dec 15 18:28:35.137 INFO [stderr] error: aborting due to previous error
Dec 15 18:28:35.137 INFO [stderr] 
Dec 15 18:28:35.138 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 15 18:28:35.149 INFO [stderr] error: Could not compile `combinatorics`.
Dec 15 18:28:35.149 INFO [stderr] 
Dec 15 18:28:35.149 INFO [stderr] To learn more, run the command again with --verbose.
Dec 15 18:28:35.150 INFO [stderr] su: No module specific data is present
Dec 15 18:28:35.575 INFO running `"docker" "inspect" "2cd9cd2333b0ae994c18d0b2ba41226cf6ecb18baca1a067235b94cebd650040"`
Dec 15 18:28:35.687 INFO running `"docker" "rm" "-f" "2cd9cd2333b0ae994c18d0b2ba41226cf6ecb18baca1a067235b94cebd650040"`
Dec 15 18:28:35.834 INFO [stdout] 2cd9cd2333b0ae994c18d0b2ba41226cf6ecb18baca1a067235b94cebd650040