[INFO] fetching crate hexgame 0.1.0...
[INFO] checking hexgame-0.1.0 against try#23ffd2897cbb44320ca18dfe4d05dbacb37d55e0 for pr-115950
[INFO] extracting crate hexgame 0.1.0 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate hexgame 0.1.0 on toolchain 23ffd2897cbb44320ca18dfe4d05dbacb37d55e0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hexgame 0.1.0
[INFO] finished tweaking crates.io crate hexgame 0.1.0
[INFO] tweaked toml for crates.io crate hexgame 0.1.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate crates.io crate hexgame 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4f8da3c744d2da974e54ce020a79f4ad54313e914ebeaab8fc086f07e8d8b066" "/opt/rustwide/cargo-home/bin/cargo" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c1a35318d1dc440a80eef4282bf951d39eee578e617edb1c3e64fad93a003f58
[INFO] running `Command { std: "docker" "start" "-a" "c1a35318d1dc440a80eef4282bf951d39eee578e617edb1c3e64fad93a003f58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1a35318d1dc440a80eef4282bf951d39eee578e617edb1c3e64fad93a003f58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1a35318d1dc440a80eef4282bf951d39eee578e617edb1c3e64fad93a003f58", kill_on_drop: false }`
[INFO] [stdout] c1a35318d1dc440a80eef4282bf951d39eee578e617edb1c3e64fad93a003f58
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4f8da3c744d2da974e54ce020a79f4ad54313e914ebeaab8fc086f07e8d8b066" "/opt/rustwide/cargo-home/bin/cargo" "+23ffd2897cbb44320ca18dfe4d05dbacb37d55e0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4ef0046f91c35f2252618de6f5e2f26bb031c56363d5de8d6614d7839d6096df
[INFO] running `Command { std: "docker" "start" "-a" "4ef0046f91c35f2252618de6f5e2f26bb031c56363d5de8d6614d7839d6096df", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.84
[INFO] [stderr]    Compiling serde_derive v1.0.132
[INFO] [stderr]    Compiling serde v1.0.132
[INFO] [stderr]    Compiling serde_json v1.0.73
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]     Checking hexgame v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0502]: cannot borrow `self.cells` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/board.rs:147:17
[INFO] [stdout]     |
[INFO] [stdout] 143 |         let mut iter = get_neighbors(&self.cells, index);
[INFO] [stdout]     |                                      ----------- immutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 147 |                 self.cells.merge(index, neighbor);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 151 |                 iter.next();
[INFO] [stdout]     |                 ---- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `hexgame` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0502]: cannot borrow `self.cells` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/board.rs:147:17
[INFO] [stdout]     |
[INFO] [stdout] 143 |         let mut iter = get_neighbors(&self.cells, index);
[INFO] [stdout]     |                                      ----------- immutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 147 |                 self.cells.merge(index, neighbor);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 151 |                 iter.next();
[INFO] [stdout]     |                 ---- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `hexgame` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "4ef0046f91c35f2252618de6f5e2f26bb031c56363d5de8d6614d7839d6096df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ef0046f91c35f2252618de6f5e2f26bb031c56363d5de8d6614d7839d6096df", kill_on_drop: false }`
[INFO] [stdout] 4ef0046f91c35f2252618de6f5e2f26bb031c56363d5de8d6614d7839d6096df