Dec 03 02:07:21.229 INFO testing math_traits-0.2.1 against 1.30.1 for beta-1.31-5
Dec 03 02:07:21.229 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-4/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/beta-1.31-5/1.30.1:/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 +1.30.1 build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 03 02:07:21.508 INFO [stdout] e22af8d3a41f0c47ace02368cf7b7740d2746cf263d2bc8db6b2d593bf9a906e
Dec 03 02:07:21.512 INFO running `"docker" "start" "-a" "e22af8d3a41f0c47ace02368cf7b7740d2746cf263d2bc8db6b2d593bf9a906e"`
Dec 03 02:07:21.958 INFO [stderr] usermod: no changes
Dec 03 02:07:22.020 INFO [stderr]    Compiling tuple v0.4.2
Dec 03 02:07:26.562 INFO [stderr]    Compiling math_traits v0.2.1 (/source)
Dec 03 02:07:27.772 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 02:07:27.772 INFO [stderr]  --> src/lib.rs:1:1
Dec 03 02:07:27.772 INFO [stderr]   |
Dec 03 02:07:27.772 INFO [stderr] 1 | #![feature(core_intrinsics)]
Dec 03 02:07:27.772 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 03 02:07:27.772 INFO [stderr] 
Dec 03 02:07:27.772 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 02:07:27.772 INFO [stderr]  --> src/lib.rs:2:1
Dec 03 02:07:27.772 INFO [stderr]   |
Dec 03 02:07:27.772 INFO [stderr] 2 | #![feature(const_fn)]
Dec 03 02:07:27.772 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
Dec 03 02:07:27.772 INFO [stderr] 
Dec 03 02:07:27.772 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 02:07:27.772 INFO [stderr]  --> src/lib.rs:3:1
Dec 03 02:07:27.772 INFO [stderr]   |
Dec 03 02:07:27.772 INFO [stderr] 3 | #![feature(concat_idents)]
Dec 03 02:07:27.772 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 03 02:07:27.772 INFO [stderr] 
Dec 03 02:07:27.785 INFO [stderr] error: aborting due to 3 previous errors
Dec 03 02:07:27.785 INFO [stderr] 
Dec 03 02:07:27.785 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 03 02:07:27.790 INFO [stderr] error: Could not compile `math_traits`.
Dec 03 02:07:27.790 INFO [stderr] 
Dec 03 02:07:27.790 INFO [stderr] To learn more, run the command again with --verbose.
Dec 03 02:07:27.791 INFO [stderr] su: No module specific data is present
Dec 03 02:07:28.057 INFO running `"docker" "inspect" "e22af8d3a41f0c47ace02368cf7b7740d2746cf263d2bc8db6b2d593bf9a906e"`
Dec 03 02:07:28.129 INFO running `"docker" "rm" "-f" "e22af8d3a41f0c47ace02368cf7b7740d2746cf263d2bc8db6b2d593bf9a906e"`
Dec 03 02:07:28.234 INFO [stdout] e22af8d3a41f0c47ace02368cf7b7740d2746cf263d2bc8db6b2d593bf9a906e