[INFO] cloning repository https://github.com/CrazyFork/rs_webserver_game
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CrazyFork/rs_webserver_game" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCrazyFork%2Frs_webserver_game", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCrazyFork%2Frs_webserver_game'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 586675fc787ab9c70fc81f8e4677dc12d239bf2b
[INFO] testing CrazyFork/rs_webserver_game against 1.75.0 for beta-1.76-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCrazyFork%2Frs_webserver_game" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CrazyFork/rs_webserver_game on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CrazyFork/rs_webserver_game
[INFO] finished tweaking git repo https://github.com/CrazyFork/rs_webserver_game
[INFO] tweaked toml for git repo https://github.com/CrazyFork/rs_webserver_game written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/CrazyFork/rs_webserver_game 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustc-serialize v0.3.23
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5c9c0f6318dc53ca52476f7789a4bf24f13e42d7b864f52378c86d9de7527e39
[INFO] running `Command { std: "docker" "start" "-a" "5c9c0f6318dc53ca52476f7789a4bf24f13e42d7b864f52378c86d9de7527e39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5c9c0f6318dc53ca52476f7789a4bf24f13e42d7b864f52378c86d9de7527e39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c9c0f6318dc53ca52476f7789a4bf24f13e42d7b864f52378c86d9de7527e39", kill_on_drop: false }`
[INFO] [stdout] 5c9c0f6318dc53ca52476f7789a4bf24f13e42d7b864f52378c86d9de7527e39
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8c5ece09893ea93e5889a813deba24e9b5eb3cdb120b267a6c7ac26fbad30987
[INFO] running `Command { std: "docker" "start" "-a" "8c5ece09893ea93e5889a813deba24e9b5eb3cdb120b267a6c7ac26fbad30987", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustc-serialize v0.3.23
[INFO] [stderr]    Compiling server-tictac v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcDecodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:12:26
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcDecodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:18:26
[INFO] [stdout]    |
[INFO] [stdout] 18 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Status` should have a snake case name
[INFO] [stdout]    --> src/common.rs:305:9
[INFO] [stdout]     |
[INFO] [stdout] 305 | pub mod Status {
[INFO] [stdout]     |         ^^^^^^ help: convert the identifier to snake case (notice the capitalization): `status`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/game_server.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | #[derive(RustcEncodable)]
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/game_server.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let mut board = match guard.board.get_mut(&user_id) {
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.44s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.23
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "8c5ece09893ea93e5889a813deba24e9b5eb3cdb120b267a6c7ac26fbad30987", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c5ece09893ea93e5889a813deba24e9b5eb3cdb120b267a6c7ac26fbad30987", kill_on_drop: false }`
[INFO] [stdout] 8c5ece09893ea93e5889a813deba24e9b5eb3cdb120b267a6c7ac26fbad30987
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 393cea4aed7f47c53a1ca0380b426cfa00dd56eb5fd896ed883e36d4ffbfa809
[INFO] running `Command { std: "docker" "start" "-a" "393cea4aed7f47c53a1ca0380b426cfa00dd56eb5fd896ed883e36d4ffbfa809", kill_on_drop: false }`
[INFO] [stderr]    Compiling server-tictac v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcDecodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:12:26
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcDecodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:18:26
[INFO] [stdout]    |
[INFO] [stdout] 18 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Status` should have a snake case name
[INFO] [stdout]    --> src/common.rs:305:9
[INFO] [stdout]     |
[INFO] [stdout] 305 | pub mod Status {
[INFO] [stdout]     |         ^^^^^^ help: convert the identifier to snake case (notice the capitalization): `status`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcDecodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:12:26
[INFO] [stdout]    |
[INFO] [stdout] 12 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcDecodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/common.rs:18:26
[INFO] [stdout]    |
[INFO] [stdout] 18 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stdout]   --> src/game_server.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | #[derive(RustcEncodable)]
[INFO] [stdout]    |          ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/game_server.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let mut board = match guard.board.get_mut(&user_id) {
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Status` should have a snake case name
[INFO] [stdout]    --> src/common.rs:305:9
[INFO] [stdout]     |
[INFO] [stdout] 305 | pub mod Status {
[INFO] [stdout]     |         ^^^^^^ help: convert the identifier to snake case (notice the capitalization): `status`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.49s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.23
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "393cea4aed7f47c53a1ca0380b426cfa00dd56eb5fd896ed883e36d4ffbfa809", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "393cea4aed7f47c53a1ca0380b426cfa00dd56eb5fd896ed883e36d4ffbfa809", kill_on_drop: false }`
[INFO] [stdout] 393cea4aed7f47c53a1ca0380b426cfa00dd56eb5fd896ed883e36d4ffbfa809
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b989c5473d50f33ac4b340917eba83b66e49995f789f07b428c4d508c7aaf958
[INFO] running `Command { std: "docker" "start" "-a" "b989c5473d50f33ac4b340917eba83b66e49995f789f07b428c4d508c7aaf958", kill_on_drop: false }`
[INFO] [stderr] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stderr]   --> src/common.rs:12:10
[INFO] [stderr]    |
[INFO] [stderr] 12 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stderr]    |          ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated macro `RustcDecodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stderr]   --> src/common.rs:12:26
[INFO] [stderr]    |
[INFO] [stderr] 12 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stderr]   --> src/common.rs:18:10
[INFO] [stderr]    |
[INFO] [stderr] 18 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stderr]    |          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated macro `RustcDecodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stderr]   --> src/common.rs:18:26
[INFO] [stderr]    |
[INFO] [stderr] 18 | #[derive(RustcEncodable, RustcDecodable, Debug)]
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: module `Status` should have a snake case name
[INFO] [stderr]    --> src/common.rs:305:9
[INFO] [stderr]     |
[INFO] [stderr] 305 | pub mod Status {
[INFO] [stderr]     |         ^^^^^^ help: convert the identifier to snake case (notice the capitalization): `status`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `server-tictac` (lib) generated 5 warnings
[INFO] [stderr] warning: use of deprecated macro `RustcEncodable`: rustc-serialize is deprecated and no longer supported
[INFO] [stderr]   --> src/game_server.rs:42:10
[INFO] [stderr]    |
[INFO] [stderr] 42 | #[derive(RustcEncodable)]
[INFO] [stderr]    |          ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/game_server.rs:79:13
[INFO] [stderr]    |
[INFO] [stderr] 79 |         let mut board = match guard.board.get_mut(&user_id) {
[INFO] [stderr]    |             ----^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `server-tictac` (bin "game_server" test) generated 2 warnings (run `cargo fix --bin "game_server" --tests` to apply 1 suggestion)
[INFO] [stderr] warning: `server-tictac` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.23
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/common.rs (/opt/rustwide/target/debug/deps/common-3f813b39d4fcb829)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/game_server.rs (/opt/rustwide/target/debug/deps/game_server-12dc8082d3ece825)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/web_server.rs (/opt/rustwide/target/debug/deps/web_server-0b3191180c42f6a8)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests common
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b989c5473d50f33ac4b340917eba83b66e49995f789f07b428c4d508c7aaf958", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b989c5473d50f33ac4b340917eba83b66e49995f789f07b428c4d508c7aaf958", kill_on_drop: false }`
[INFO] [stdout] b989c5473d50f33ac4b340917eba83b66e49995f789f07b428c4d508c7aaf958
