Dec 15 18:28:33.827 INFO testing combinatorics-0.0.1 against try#aa49d8ef14939ddec0e34b346b60174a5673d48f for pr-56550
Dec 15 18:28:33.827 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-4/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56550/try#aa49d8ef14939ddec0e34b346b60174a5673d48f:/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 +aa49d8ef14939ddec0e34b346b60174a5673d48f-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 18:28:34.026 INFO [stdout] 5318ee85aef045d8fdafbcf117cc80eeaa31420b2ff4dda6cbf8a343706d97c6
Dec 15 18:28:34.028 INFO running `"docker" "start" "-a" "5318ee85aef045d8fdafbcf117cc80eeaa31420b2ff4dda6cbf8a343706d97c6"`
Dec 15 18:28:34.483 INFO [stderr] usermod: no changes
Dec 15 18:28:34.515 INFO [stderr]    Compiling combinatorics v0.0.1 (/source)
Dec 15 18:28:35.041 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 18:28:35.041 INFO [stderr]   --> src/lib.rs:29:1
Dec 15 18:28:35.041 INFO [stderr]    |
Dec 15 18:28:35.041 INFO [stderr] 29 | extern crate libc;
Dec 15 18:28:35.042 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^
Dec 15 18:28:35.042 INFO [stderr]    |
Dec 15 18:28:35.042 INFO [stderr]    = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 15 18:28:35.042 INFO [stderr] 
Dec 15 18:28:35.068 INFO [stderr] error: aborting due to previous error
Dec 15 18:28:35.068 INFO [stderr] 
Dec 15 18:28:35.068 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 15 18:28:35.076 INFO [stderr] error: Could not compile `combinatorics`.
Dec 15 18:28:35.076 INFO [stderr] 
Dec 15 18:28:35.076 INFO [stderr] To learn more, run the command again with --verbose.
Dec 15 18:28:35.078 INFO [stderr] su: No module specific data is present
Dec 15 18:28:35.408 INFO running `"docker" "inspect" "5318ee85aef045d8fdafbcf117cc80eeaa31420b2ff4dda6cbf8a343706d97c6"`
Dec 15 18:28:35.515 INFO running `"docker" "rm" "-f" "5318ee85aef045d8fdafbcf117cc80eeaa31420b2ff4dda6cbf8a343706d97c6"`
Dec 15 18:28:35.695 INFO [stdout] 5318ee85aef045d8fdafbcf117cc80eeaa31420b2ff4dda6cbf8a343706d97c6