Dec 14 21:34:36.788 INFO testing rustbar-0.2.0 against master#bd47d6825bf4090517549d33cfef10d3300b4a75 for pr-56550
Dec 14 21:34:36.788 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-0/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/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 14 21:34:37.327 INFO [stdout] bd243fb7d25ee2e4527f8b99fe48997564cf503e89f31428f7c715a243b70f2e
Dec 14 21:34:37.332 INFO running `"docker" "start" "-a" "bd243fb7d25ee2e4527f8b99fe48997564cf503e89f31428f7c715a243b70f2e"`
Dec 14 21:34:38.507 INFO [stderr] usermod: no changes
Dec 14 21:34:38.589 INFO [stderr]    Compiling rustbar v0.2.0 (/source)
Dec 14 21:34:39.207 INFO [stderr] warning: patterns aren't allowed in methods without bodies
Dec 14 21:34:39.207 INFO [stderr]   --> src/rustbars.rs:22:18
Dec 14 21:34:39.207 INFO [stderr]    |
Dec 14 21:34:39.207 INFO [stderr] 22 |     fn to_stderr(mut self) -> T;
Dec 14 21:34:39.207 INFO [stderr]    |                  ^^^^^^^^
Dec 14 21:34:39.207 INFO [stderr]    |
Dec 14 21:34:39.207 INFO [stderr]    = note: #[warn(patterns_in_fns_without_body)] on by default
Dec 14 21:34:39.207 INFO [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
Dec 14 21:34:39.207 INFO [stderr]    = note: for more information, see issue #35203 <https://github.com/rust-lang/rust/issues/35203>
Dec 14 21:34:39.207 INFO [stderr] 
Dec 14 21:34:39.207 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 14 21:34:39.207 INFO [stderr]  --> src/lib.rs:3:1
Dec 14 21:34:39.207 INFO [stderr]   |
Dec 14 21:34:39.207 INFO [stderr] 3 | extern crate libc;
Dec 14 21:34:39.207 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 14 21:34:39.207 INFO [stderr]   |
Dec 14 21:34:39.207 INFO [stderr]   = help: add #![feature(rustc_private)] to the crate attributes to enable
Dec 14 21:34:39.207 INFO [stderr] 
Dec 14 21:34:39.229 INFO [stderr] error: aborting due to previous error
Dec 14 21:34:39.229 INFO [stderr] 
Dec 14 21:34:39.229 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 14 21:34:39.235 INFO [stderr] error: Could not compile `rustbar`.
Dec 14 21:34:39.235 INFO [stderr] 
Dec 14 21:34:39.235 INFO [stderr] To learn more, run the command again with --verbose.
Dec 14 21:34:39.235 INFO [stderr] su: No module specific data is present
Dec 14 21:34:40.043 INFO running `"docker" "inspect" "bd243fb7d25ee2e4527f8b99fe48997564cf503e89f31428f7c715a243b70f2e"`
Dec 14 21:34:40.302 INFO running `"docker" "rm" "-f" "bd243fb7d25ee2e4527f8b99fe48997564cf503e89f31428f7c715a243b70f2e"`
Dec 14 21:34:40.547 INFO [stdout] bd243fb7d25ee2e4527f8b99fe48997564cf503e89f31428f7c715a243b70f2e