Nov 02 05:58:29.626 INFO testing rx-0.0.1 against 1.30.0 for beta-1.31-1
Nov 02 05:58:29.626 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-1/worker-2/1.30.0:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/beta-1.31-1/1.30.0:/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 +1.30.0 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"`
Nov 02 05:58:30.084 INFO blam! cf6c27eaff02cdc30945d27e0535424d833354b39189f443524dd024aede3db4
Nov 02 05:58:30.086 INFO running `"docker" "start" "-a" "cf6c27eaff02cdc30945d27e0535424d833354b39189f443524dd024aede3db4"`
Nov 02 05:58:31.311 INFO kablam! usermod: no changes
Nov 02 05:58:31.399 INFO kablam!    Compiling rx v0.0.1 (/source)
Nov 02 05:58:32.015 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Nov 02 05:58:32.015 INFO kablam!   --> src/lib.rs:16:1
Nov 02 05:58:32.015 INFO kablam!    |
Nov 02 05:58:32.015 INFO kablam! 16 | #![feature(fn_traits, unboxed_closures)]
Nov 02 05:58:32.015 INFO kablam!    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 02 05:58:32.015 INFO kablam! 
Nov 02 05:58:32.015 INFO kablam! error: aborting due to previous error
Nov 02 05:58:32.015 INFO kablam! 
Nov 02 05:58:32.015 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Nov 02 05:58:32.020 INFO kablam! error: Could not compile `rx`.
Nov 02 05:58:32.021 INFO kablam! 
Nov 02 05:58:32.021 INFO kablam! To learn more, run the command again with --verbose.
Nov 02 05:58:32.023 INFO kablam! su: No module specific data is present
Nov 02 05:58:32.615 INFO running `"docker" "rm" "-f" "cf6c27eaff02cdc30945d27e0535424d833354b39189f443524dd024aede3db4"`
Nov 02 05:58:32.860 INFO blam! cf6c27eaff02cdc30945d27e0535424d833354b39189f443524dd024aede3db4
