Dec 02 14:09:04.344 INFO testing thunder-0.3.1 against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 02 14:09:04.344 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-3/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/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 +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt 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 02 14:09:04.849 INFO [stdout] 78c53933aa216949998a360921db905b7ee610b9868cfd541430b1a5fb932696
Dec 02 14:09:04.854 INFO running `"docker" "start" "-a" "78c53933aa216949998a360921db905b7ee610b9868cfd541430b1a5fb932696"`
Dec 02 14:09:06.114 INFO [stderr] usermod: no changes
Dec 02 14:09:06.239 INFO [stderr]    Compiling syn v0.12.15
Dec 02 14:09:29.113 INFO [stderr]    Compiling thunder v0.3.1 (/source)
Dec 02 14:09:32.275 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 14:09:32.276 INFO [stderr]  --> src/lib.rs:2:1
Dec 02 14:09:32.276 INFO [stderr]   |
Dec 02 14:09:32.276 INFO [stderr] 2 | #![feature(external_doc)]
Dec 02 14:09:32.276 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 14:09:32.276 INFO [stderr] 
Dec 02 14:09:32.276 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 14:09:32.276 INFO [stderr]  --> src/lib.rs:4:1
Dec 02 14:09:32.276 INFO [stderr]   |
Dec 02 14:09:32.276 INFO [stderr] 4 | #![feature(proc_macro, proc_macro_lib)]
Dec 02 14:09:32.276 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 14:09:32.276 INFO [stderr] 
Dec 02 14:09:32.276 INFO [stderr] error: aborting due to 2 previous errors
Dec 02 14:09:32.276 INFO [stderr] 
Dec 02 14:09:32.276 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 14:09:32.286 INFO [stderr] error: Could not compile `thunder`.
Dec 02 14:09:32.286 INFO [stderr] 
Dec 02 14:09:32.286 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 14:09:32.286 INFO [stderr] su: No module specific data is present
Dec 02 14:09:33.065 INFO running `"docker" "inspect" "78c53933aa216949998a360921db905b7ee610b9868cfd541430b1a5fb932696"`
Dec 02 14:09:33.366 INFO running `"docker" "rm" "-f" "78c53933aa216949998a360921db905b7ee610b9868cfd541430b1a5fb932696"`
Dec 02 14:09:33.698 INFO [stdout] 78c53933aa216949998a360921db905b7ee610b9868cfd541430b1a5fb932696