Dec 03 03:11:54.481 INFO testing lib_composite-0.6.0 against 1.30.1 for beta-1.31-5
Dec 03 03:11:54.481 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-7/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/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 03:11:54.691 INFO [stdout] 5ec20d009a440234d1f1c6468ef8b1739c1d624c21c7a286c074e3fa7d19cedf
Dec 03 03:11:54.707 INFO running `"docker" "start" "-a" "5ec20d009a440234d1f1c6468ef8b1739c1d624c21c7a286c074e3fa7d19cedf"`
Dec 03 03:11:55.348 INFO [stderr] usermod: no changes
Dec 03 03:11:55.395 INFO [stderr]    Compiling libc v0.2.44
Dec 03 03:11:55.395 INFO [stderr]    Compiling cfg-if v0.1.6
Dec 03 03:11:58.899 INFO [stderr]    Compiling const-cstr-fork v0.2.2
Dec 03 03:11:59.591 INFO [stderr]    Compiling libc-extra v0.0.15
Dec 03 03:12:03.198 INFO [stderr]    Compiling lib_composite v0.6.0 (/source)
Dec 03 03:12:03.989 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 03:12:03.989 INFO [stderr]  --> src/lib.rs:4:1
Dec 03 03:12:03.989 INFO [stderr]   |
Dec 03 03:12:03.989 INFO [stderr] 4 | #![feature(optin_builtin_traits)]
Dec 03 03:12:03.989 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 03 03:12:03.989 INFO [stderr] 
Dec 03 03:12:03.989 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 03:12:03.989 INFO [stderr]  --> src/lib.rs:6:1
Dec 03 03:12:03.989 INFO [stderr]   |
Dec 03 03:12:03.989 INFO [stderr] 6 | #![feature(fnbox)]
Dec 03 03:12:03.989 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 03 03:12:03.989 INFO [stderr] 
Dec 03 03:12:03.989 INFO [stderr] error: aborting due to 2 previous errors
Dec 03 03:12:03.989 INFO [stderr] 
Dec 03 03:12:03.989 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 03 03:12:03.989 INFO [stderr] error: Could not compile `lib_composite`.
Dec 03 03:12:03.989 INFO [stderr] 
Dec 03 03:12:03.989 INFO [stderr] To learn more, run the command again with --verbose.
Dec 03 03:12:03.995 INFO [stderr] su: No module specific data is present
Dec 03 03:12:04.645 INFO running `"docker" "inspect" "5ec20d009a440234d1f1c6468ef8b1739c1d624c21c7a286c074e3fa7d19cedf"`
Dec 03 03:12:04.845 INFO running `"docker" "rm" "-f" "5ec20d009a440234d1f1c6468ef8b1739c1d624c21c7a286c074e3fa7d19cedf"`
Dec 03 03:12:05.083 INFO [stdout] 5ec20d009a440234d1f1c6468ef8b1739c1d624c21c7a286c074e3fa7d19cedf