Dec 03 12:31:19.690 INFO testing exar-0.1.0 against 1.30.1 for beta-1.31-5
Dec 03 12:31:19.690 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-6/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/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 12:31:19.951 INFO [stdout] 2de2fc00329d948f86a083bdc120d9e51ca27969f1228e4ddb5808a9170666dc
Dec 03 12:31:19.953 INFO running `"docker" "start" "-a" "2de2fc00329d948f86a083bdc120d9e51ca27969f1228e4ddb5808a9170666dc"`
Dec 03 12:31:21.419 INFO [stderr] usermod: no changes
Dec 03 12:31:21.555 INFO [stderr]    Compiling indexed-line-reader v0.2.0
Dec 03 12:31:22.927 INFO [stderr]    Compiling exar v0.1.0 (/source)
Dec 03 12:31:26.141 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.69s
Dec 03 12:31:26.142 INFO [stderr] su: No module specific data is present
Dec 03 12:31:26.464 INFO running `"docker" "inspect" "2de2fc00329d948f86a083bdc120d9e51ca27969f1228e4ddb5808a9170666dc"`
Dec 03 12:31:26.576 INFO running `"docker" "rm" "-f" "2de2fc00329d948f86a083bdc120d9e51ca27969f1228e4ddb5808a9170666dc"`
Dec 03 12:31:26.694 INFO [stdout] 2de2fc00329d948f86a083bdc120d9e51ca27969f1228e4ddb5808a9170666dc
Dec 03 12:31:26.697 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-6/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/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 test --frozen --no-run" "-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 12:31:26.903 INFO [stdout] 8e1c4f1c1058b02439b687778f79999f0ec36966d1bd322a59708c283c6003b9
Dec 03 12:31:26.909 INFO running `"docker" "start" "-a" "8e1c4f1c1058b02439b687778f79999f0ec36966d1bd322a59708c283c6003b9"`
Dec 03 12:31:27.603 INFO [stderr] usermod: no changes
Dec 03 12:31:27.675 INFO [stderr]    Compiling exar-testkit v0.1.0
Dec 03 12:31:28.375 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 12:31:28.375 INFO [stderr]  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/exar-testkit-0.1.0/src/lib.rs:1:1
Dec 03 12:31:28.375 INFO [stderr]   |
Dec 03 12:31:28.375 INFO [stderr] 1 | #![feature(const_fn)]
Dec 03 12:31:28.375 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
Dec 03 12:31:28.375 INFO [stderr] 
Dec 03 12:31:28.375 INFO [stderr] error: aborting due to previous error
Dec 03 12:31:28.375 INFO [stderr] 
Dec 03 12:31:28.375 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 03 12:31:28.383 INFO [stderr] error: Could not compile `exar-testkit`.
Dec 03 12:31:28.383 INFO [stderr] 
Dec 03 12:31:28.383 INFO [stderr] To learn more, run the command again with --verbose.
Dec 03 12:31:28.384 INFO [stderr] su: No module specific data is present
Dec 03 12:31:28.766 INFO running `"docker" "inspect" "8e1c4f1c1058b02439b687778f79999f0ec36966d1bd322a59708c283c6003b9"`
Dec 03 12:31:28.907 INFO running `"docker" "rm" "-f" "8e1c4f1c1058b02439b687778f79999f0ec36966d1bd322a59708c283c6003b9"`
Dec 03 12:31:29.012 INFO [stdout] 8e1c4f1c1058b02439b687778f79999f0ec36966d1bd322a59708c283c6003b9