[INFO] updating cached repository Undo-all/blokus-ai
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Undo-all/blokus-ai
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Undo-all/blokus-ai" "work/ex/beta-1.38-1/sources/1.37.0/gh/Undo-all/blokus-ai"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Undo-all/blokus-ai'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Undo-all/blokus-ai" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Undo-all/blokus-ai"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Undo-all/blokus-ai'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 63259342c42fb52b888b845482bc91df20f11107
[INFO] sha for GitHub repo Undo-all/blokus-ai: 63259342c42fb52b888b845482bc91df20f11107
[INFO] validating manifest of Undo-all/blokus-ai on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Undo-all/blokus-ai on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Undo-all/blokus-ai
[INFO] finished frobbing Undo-all/blokus-ai
[INFO] frobbed toml for Undo-all/blokus-ai written to work/ex/beta-1.38-1/sources/1.37.0/gh/Undo-all/blokus-ai/Cargo.toml
[INFO] started frobbing Undo-all/blokus-ai
[INFO] finished frobbing Undo-all/blokus-ai
[INFO] frobbed toml for Undo-all/blokus-ai written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Undo-all/blokus-ai/Cargo.toml
[INFO] crate Undo-all/blokus-ai already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Undo-all/blokus-ai against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Undo-all/blokus-ai:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 3ddefcd4f5fdec63ada76a40a2afdd93c7d88e1a4c7e9ba94b21bfdebdf96d05
[INFO] running `"docker" "start" "-a" "3ddefcd4f5fdec63ada76a40a2afdd93c7d88e1a4c7e9ba94b21bfdebdf96d05"`
[INFO] [stderr]    Compiling blokus-ai v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(nll)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(core_intrinsics)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(duration_as_u128)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::pieces`
[INFO] [stderr]  --> src/board.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use crate::pieces;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::player`
[INFO] [stderr]  --> src/board.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use crate::player;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::player`
[INFO] [stderr]  --> src/mcts.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use crate::player;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::bitboard::*`
[INFO] [stderr]   --> src/main.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 | use crate::bitboard::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]   --> src/main.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 | use std::io::Write;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]   --> src/main.rs:27:41
[INFO] [stderr]    |
[INFO] [stderr] 27 | use rand::{rngs::SmallRng, FromEntropy, Rng};
[INFO] [stderr]    |                                         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::shape::*`
[INFO] [stderr]   --> src/main.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 | use crate::shape::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `blokus-ai`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3ddefcd4f5fdec63ada76a40a2afdd93c7d88e1a4c7e9ba94b21bfdebdf96d05"`
[INFO] running `"docker" "rm" "-f" "3ddefcd4f5fdec63ada76a40a2afdd93c7d88e1a4c7e9ba94b21bfdebdf96d05"`
[INFO] [stdout] 3ddefcd4f5fdec63ada76a40a2afdd93c7d88e1a4c7e9ba94b21bfdebdf96d05