Dec 02 20:34:54.808 INFO testing render-tree-0.1.0 against 1.30.1 for beta-1.31-5
Dec 02 20:34:54.808 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-1/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/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 02 20:34:55.307 INFO [stdout] 90919eec9d94fd2856acc77e16fe603f148be4d7e04ff3bbc0d0482e3265383d
Dec 02 20:34:55.312 INFO running `"docker" "start" "-a" "90919eec9d94fd2856acc77e16fe603f148be4d7e04ff3bbc0d0482e3265383d"`
Dec 02 20:34:56.376 INFO [stderr] usermod: no changes
Dec 02 20:34:56.419 INFO [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
Dec 02 20:34:56.457 INFO [stderr]    Compiling render-tree v0.1.0 (/source)
Dec 02 20:34:56.473 INFO [stderr] error: Edition 2018 is unstable and only available for nightly builds of rustc.
Dec 02 20:34:56.473 INFO [stderr] 
Dec 02 20:34:56.485 INFO [stderr] error: Could not compile `render-tree`.
Dec 02 20:34:56.485 INFO [stderr] 
Dec 02 20:34:56.485 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 20:34:56.486 INFO [stderr] su: No module specific data is present
Dec 02 20:34:56.908 INFO running `"docker" "inspect" "90919eec9d94fd2856acc77e16fe603f148be4d7e04ff3bbc0d0482e3265383d"`
Dec 02 20:34:57.033 INFO running `"docker" "rm" "-f" "90919eec9d94fd2856acc77e16fe603f148be4d7e04ff3bbc0d0482e3265383d"`
Dec 02 20:34:57.134 INFO [stdout] 90919eec9d94fd2856acc77e16fe603f148be4d7e04ff3bbc0d0482e3265383d