[INFO] cloning repository https://github.com/dali99/mercury
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dali99/mercury" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdali99%2Fmercury", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdali99%2Fmercury'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e9e4ca74bef86a9c62942bec350d5381a97611d8
[INFO] checking dali99/mercury against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdali99%2Fmercury" "/workspace/builds/worker-38/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-38/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dali99/mercury on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dali99/mercury
[INFO] finished tweaking git repo https://github.com/dali99/mercury
[INFO] tweaked toml for git repo https://github.com/dali99/mercury written to /workspace/builds/worker-38/source/Cargo.toml
[INFO] crate git repo https://github.com/dali99/mercury already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 622427e4a3c012b0d43511a10484e362688a17c6fde6841a329997e1fe257f8b
[INFO] running `Command { std: "docker" "start" "-a" "622427e4a3c012b0d43511a10484e362688a17c6fde6841a329997e1fe257f8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "622427e4a3c012b0d43511a10484e362688a17c6fde6841a329997e1fe257f8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "622427e4a3c012b0d43511a10484e362688a17c6fde6841a329997e1fe257f8b", kill_on_drop: false }`
[INFO] [stdout] 622427e4a3c012b0d43511a10484e362688a17c6fde6841a329997e1fe257f8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aa7d530909ca7c0bbfbbf153f75e7c14d8ce24d1c5e00a710c66faf33507a61d
[INFO] running `Command { std: "docker" "start" "-a" "aa7d530909ca7c0bbfbbf153f75e7c14d8ce24d1c5e00a710c66faf33507a61d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.58
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling futures-core v0.3.15
[INFO] [stderr]    Compiling futures-channel v0.3.15
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling getrandom v0.2.0
[INFO] [stderr]    Compiling futures-task v0.3.15
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]     Checking futures-sink v0.3.15
[INFO] [stderr]     Checking futures-io v0.3.15
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]    Compiling event-listener v2.5.1
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]    Compiling cached_proc_macro_types v0.1.0
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking tinyvec v1.1.0
[INFO] [stderr]     Checking thousands v0.2.0
[INFO] [stderr]    Compiling futures-macro v0.3.15
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling futures-util v0.3.15
[INFO] [stderr]    Compiling ahash v0.7.2
[INFO] [stderr]    Compiling async-mutex v1.4.0
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]     Checking coz v0.1.3
[INFO] [stderr]     Checking rand_core v0.6.0
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.1
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling modular-bitfield-impl v0.11.2
[INFO] [stderr]    Compiling async-trait v0.1.42
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling cached_proc_macro v0.6.0
[INFO] [stderr]     Checking modular-bitfield v0.11.2
[INFO] [stderr]     Checking futures-executor v0.3.15
[INFO] [stderr]     Checking futures v0.3.15
[INFO] [stderr]     Checking cached v0.23.0
[INFO] [stderr]     Checking mercury v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:495:61
[INFO] [stdout]     |
[INFO] [stdout] 495 |                         Tile::Blue => {self.box_top.blue += (row as u8 + 1)}
[INFO] [stdout]     |                                                             ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:496:65
[INFO] [stdout]     |
[INFO] [stdout] 496 |                         Tile::Yellow => {self.box_top.yellow += (row as u8 + 1)}
[INFO] [stdout]     |                                                                 ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:497:59
[INFO] [stdout]     |
[INFO] [stdout] 497 |                         Tile::Red => {self.box_top.red += (row as u8 + 1)}
[INFO] [stdout]     |                                                           ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:498:63
[INFO] [stdout]     |
[INFO] [stdout] 498 |                         Tile::Black => {self.box_top.black += (row as u8 + 1)}
[INFO] [stdout]     |                                                               ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:499:61
[INFO] [stdout]     |
[INFO] [stdout] 499 |                         Tile::Teal => {self.box_top.teal += (row as u8 + 1)}
[INFO] [stdout]     |                                                             ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/azul2.rs:39:1
[INFO] [stdout]    |
[INFO] [stdout] 39 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]    | ^ help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/azul2.rs:39:1
[INFO] [stdout]    |
[INFO] [stdout] 39 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]    | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/azul2.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]    | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/azul2.rs:93:1
[INFO] [stdout]    |
[INFO] [stdout] 93 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]    | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:136:1
[INFO] [stdout]     |
[INFO] [stdout] 136 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:147:1
[INFO] [stdout]     |
[INFO] [stdout] 147 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:157:1
[INFO] [stdout]     |
[INFO] [stdout] 157 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:169:1
[INFO] [stdout]     |
[INFO] [stdout] 169 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:173:1
[INFO] [stdout]     |
[INFO] [stdout] 173 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:177:1
[INFO] [stdout]     |
[INFO] [stdout] 177 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:181:1
[INFO] [stdout]     |
[INFO] [stdout] 181 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:185:1
[INFO] [stdout]     |
[INFO] [stdout] 185 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:190:1
[INFO] [stdout]     |
[INFO] [stdout] 190 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:201:1
[INFO] [stdout]     |
[INFO] [stdout] 201 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]    --> src/azul2.rs:485:26
[INFO] [stdout]     |
[INFO] [stdout] 485 | use std::time::{Instant, Duration};
[INFO] [stdout]     |                          ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:495:61
[INFO] [stdout]     |
[INFO] [stdout] 495 |                         Tile::Blue => {self.box_top.blue += (row as u8 + 1)}
[INFO] [stdout]     |                                                             ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:496:65
[INFO] [stdout]     |
[INFO] [stdout] 496 |                         Tile::Yellow => {self.box_top.yellow += (row as u8 + 1)}
[INFO] [stdout]     |                                                                 ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:497:59
[INFO] [stdout]     |
[INFO] [stdout] 497 |                         Tile::Red => {self.box_top.red += (row as u8 + 1)}
[INFO] [stdout]     |                                                           ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:498:63
[INFO] [stdout]     |
[INFO] [stdout] 498 |                         Tile::Black => {self.box_top.black += (row as u8 + 1)}
[INFO] [stdout]     |                                                               ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/azul.rs:499:61
[INFO] [stdout]     |
[INFO] [stdout] 499 |                         Tile::Teal => {self.box_top.teal += (row as u8 + 1)}
[INFO] [stdout]     |                                                             ^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/azul2.rs:39:1
[INFO] [stdout]    |
[INFO] [stdout] 39 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]    | ^ help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/azul2.rs:39:1
[INFO] [stdout]    |
[INFO] [stdout] 39 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]    | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/azul2.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]    | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/azul2.rs:93:1
[INFO] [stdout]    |
[INFO] [stdout] 93 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]    | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:136:1
[INFO] [stdout]     |
[INFO] [stdout] 136 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:147:1
[INFO] [stdout]     |
[INFO] [stdout] 147 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:157:1
[INFO] [stdout]     |
[INFO] [stdout] 157 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:169:1
[INFO] [stdout]     |
[INFO] [stdout] 169 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:173:1
[INFO] [stdout]     |
[INFO] [stdout] 173 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:177:1
[INFO] [stdout]     |
[INFO] [stdout] 177 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:181:1
[INFO] [stdout]     |
[INFO] [stdout] 181 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:185:1
[INFO] [stdout]     |
[INFO] [stdout] 185 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:190:1
[INFO] [stdout]     |
[INFO] [stdout] 190 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/azul2.rs:201:1
[INFO] [stdout]     |
[INFO] [stdout] 201 | #[derive(BitfieldSpecifier)]
[INFO] [stdout]     | ^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Duration`
[INFO] [stdout]    --> src/azul2.rs:485:26
[INFO] [stdout]     |
[INFO] [stdout] 485 | use std::time::{Instant, Duration};
[INFO] [stdout]     |                          ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]    --> src/azul2.rs:498:9
[INFO] [stdout]     |
[INFO] [stdout] 498 |         std::hint::black_box(game2_2);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]    --> src/azul2.rs:498:9
[INFO] [stdout]     |
[INFO] [stdout] 498 |         std::hint::black_box(game2_2);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mercury` due to 3 previous errors; 20 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 2 previous errors; 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "aa7d530909ca7c0bbfbbf153f75e7c14d8ce24d1c5e00a710c66faf33507a61d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa7d530909ca7c0bbfbbf153f75e7c14d8ce24d1c5e00a710c66faf33507a61d", kill_on_drop: false }`
[INFO] [stdout] aa7d530909ca7c0bbfbbf153f75e7c14d8ce24d1c5e00a710c66faf33507a61d
