Dec 03 00:50:42.308 INFO testing nb-sync-0.2.0 against 1.30.1 for beta-1.31-5
Dec 03 00:50:42.308 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-0/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/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 00:50:42.605 INFO [stdout] dfb2f76b3dc0b078836e9d1572f195267a758863474f0131022cecb39b32fb7c
Dec 03 00:50:42.607 INFO running `"docker" "start" "-a" "dfb2f76b3dc0b078836e9d1572f195267a758863474f0131022cecb39b32fb7c"`
Dec 03 00:50:43.165 INFO [stderr] usermod: no changes
Dec 03 00:50:43.209 INFO [stderr]    Compiling nb-sync v0.2.0 (/source)
Dec 03 00:50:43.298 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 00:50:43.298 INFO [stderr]    --> src/lib.rs:134:1
Dec 03 00:50:43.298 INFO [stderr]     |
Dec 03 00:50:43.298 INFO [stderr] 134 | #![feature(const_fn)]
Dec 03 00:50:43.298 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^
Dec 03 00:50:43.298 INFO [stderr] 
Dec 03 00:50:43.298 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 00:50:43.298 INFO [stderr]    --> src/lib.rs:135:1
Dec 03 00:50:43.298 INFO [stderr]     |
Dec 03 00:50:43.298 INFO [stderr] 135 | #![feature(optin_builtin_traits)]
Dec 03 00:50:43.298 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 03 00:50:43.298 INFO [stderr] 
Dec 03 00:50:43.298 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 00:50:43.298 INFO [stderr]    --> src/lib.rs:136:1
Dec 03 00:50:43.298 INFO [stderr]     |
Dec 03 00:50:43.298 INFO [stderr] 136 | #![feature(never_type)]
Dec 03 00:50:43.298 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^
Dec 03 00:50:43.299 INFO [stderr] 
Dec 03 00:50:43.299 INFO [stderr] error: aborting due to 3 previous errors
Dec 03 00:50:43.299 INFO [stderr] 
Dec 03 00:50:43.299 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 03 00:50:43.304 INFO [stderr] error: Could not compile `nb-sync`.
Dec 03 00:50:43.304 INFO [stderr] 
Dec 03 00:50:43.304 INFO [stderr] To learn more, run the command again with --verbose.
Dec 03 00:50:43.305 INFO [stderr] su: No module specific data is present
Dec 03 00:50:43.835 INFO running `"docker" "inspect" "dfb2f76b3dc0b078836e9d1572f195267a758863474f0131022cecb39b32fb7c"`
Dec 03 00:50:44.079 INFO running `"docker" "rm" "-f" "dfb2f76b3dc0b078836e9d1572f195267a758863474f0131022cecb39b32fb7c"`
Dec 03 00:50:44.367 INFO [stdout] dfb2f76b3dc0b078836e9d1572f195267a758863474f0131022cecb39b32fb7c