[INFO] fetching crate guard 0.5.1...
[INFO] testing guard-0.5.1 against 1.69.0 for beta-1.70-1
[INFO] extracting crate guard 0.5.1 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate guard 0.5.1 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate guard 0.5.1
[INFO] finished tweaking crates.io crate guard 0.5.1
[INFO] tweaked toml for crates.io crate guard 0.5.1 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate guard 0.5.1 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" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0c83fd433917dbad4e8c9cfce30c04444c2a7a0eddf39691b43c28de4345ddb7
[INFO] running `Command { std: "docker" "start" "-a" "0c83fd433917dbad4e8c9cfce30c04444c2a7a0eddf39691b43c28de4345ddb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0c83fd433917dbad4e8c9cfce30c04444c2a7a0eddf39691b43c28de4345ddb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c83fd433917dbad4e8c9cfce30c04444c2a7a0eddf39691b43c28de4345ddb7", kill_on_drop: false }`
[INFO] [stdout] 0c83fd433917dbad4e8c9cfce30c04444c2a7a0eddf39691b43c28de4345ddb7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 449b78f7eb653624d170fda2f3d2b60b7bfa66badc0adf2500b0b2fd4cf3bbbf
[INFO] running `Command { std: "docker" "start" "-a" "449b78f7eb653624d170fda2f3d2b60b7bfa66badc0adf2500b0b2fd4cf3bbbf", kill_on_drop: false }`
[INFO] [stderr]    Compiling guard v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:426:20
[INFO] [stdout]     |
[INFO] [stdout] 426 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:430:29
[INFO] [stdout]     |
[INFO] [stdout] 430 |         let mut foo = Some((box 42, [1, 2, 3]));
[INFO] [stdout]     |                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:446:20
[INFO] [stdout]     |
[INFO] [stdout] 446 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:451:20
[INFO] [stdout]     |
[INFO] [stdout] 451 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "449b78f7eb653624d170fda2f3d2b60b7bfa66badc0adf2500b0b2fd4cf3bbbf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "449b78f7eb653624d170fda2f3d2b60b7bfa66badc0adf2500b0b2fd4cf3bbbf", kill_on_drop: false }`
[INFO] [stdout] 449b78f7eb653624d170fda2f3d2b60b7bfa66badc0adf2500b0b2fd4cf3bbbf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f03259bfb4d057c2859c7d8defb25b85b3bb36a8bf19739d6b67ee7d5cfe550e
[INFO] running `Command { std: "docker" "start" "-a" "f03259bfb4d057c2859c7d8defb25b85b3bb36a8bf19739d6b67ee7d5cfe550e", kill_on_drop: false }`
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:426:20
[INFO] [stdout]     |
[INFO] [stdout] 426 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling guard v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:430:29
[INFO] [stdout]     |
[INFO] [stdout] 430 |         let mut foo = Some((box 42, [1, 2, 3]));
[INFO] [stdout]     |                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:446:20
[INFO] [stdout]     |
[INFO] [stdout] 446 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:451:20
[INFO] [stdout]     |
[INFO] [stdout] 451 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:426:20
[INFO] [stdout]     |
[INFO] [stdout] 426 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:430:29
[INFO] [stdout]     |
[INFO] [stdout] 430 |         let mut foo = Some((box 42, [1, 2, 3]));
[INFO] [stdout]     |                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:446:20
[INFO] [stdout]     |
[INFO] [stdout] 446 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stdout]    --> src/lib.rs:451:20
[INFO] [stdout]     |
[INFO] [stdout] 451 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stdout]     |                    ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.00s
[INFO] running `Command { std: "docker" "inspect" "f03259bfb4d057c2859c7d8defb25b85b3bb36a8bf19739d6b67ee7d5cfe550e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f03259bfb4d057c2859c7d8defb25b85b3bb36a8bf19739d6b67ee7d5cfe550e", kill_on_drop: false }`
[INFO] [stdout] f03259bfb4d057c2859c7d8defb25b85b3bb36a8bf19739d6b67ee7d5cfe550e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6b3d1a8d97bbb6bb9ba667503f7ab1f0ef7cf708fe4fe98d3a1bf8bfd1f7c57a
[INFO] running `Command { std: "docker" "start" "-a" "6b3d1a8d97bbb6bb9ba667503f7ab1f0ef7cf708fe4fe98d3a1bf8bfd1f7c57a", kill_on_drop: false }`
[INFO] [stderr] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stderr]    --> src/lib.rs:426:20
[INFO] [stderr]     |
[INFO] [stderr] 426 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stderr]     |                    ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stderr]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stderr]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stderr] 
[INFO] [stderr] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stderr]    --> src/lib.rs:430:29
[INFO] [stderr]     |
[INFO] [stderr] 430 |         let mut foo = Some((box 42, [1, 2, 3]));
[INFO] [stderr]     |                             ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stderr]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stderr]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stderr] 
[INFO] [stderr] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stderr]    --> src/lib.rs:446:20
[INFO] [stderr]     |
[INFO] [stderr] 446 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stderr]     |                    ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stderr]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stderr]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stderr] 
[INFO] [stderr] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stderr]    --> src/lib.rs:451:20
[INFO] [stderr]     |
[INFO] [stderr] 451 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stderr]     |                    ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stderr]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stderr]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stderr] 
[INFO] [stderr] warning: `guard` (lib) generated 4 warnings
[INFO] [stderr] warning: `guard` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/guard-b6bc990777759c1d)
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test guard_unwrap::test::should_match ... ok
[INFO] [stdout] test tests::empty ... ok
[INFO] [stdout] test tests::new_syntax ... ok
[INFO] [stdout] test tests::various ... ok
[INFO] [stdout] test guard_unwrap::test::should_bind ... ok
[INFO] [stderr]      Running tests/guard_unwrap.rs (/opt/rustwide/target/debug/deps/guard_unwrap-93ac2efee7261e98)
[INFO] [stdout] test guard_unwrap::test::panic_message_should_include_matched_expression - should panic ... ok
[INFO] [stdout] test guard_unwrap::test::panic_message_should_include_pattern - should panic ... ok
[INFO] [stdout] test guard_unwrap::test::should_panic - should panic ... ok
[INFO] [stdout] test guard_unwrap::test::should_have_nice_panic_message - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test should_be_usable_from_different_crate ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests guard
[INFO] [stderr] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stderr]    --> /opt/rustwide/workdir/src/lib.rs:426:20
[INFO] [stderr]     |
[INFO] [stderr] 426 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stderr]     |                    ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stderr]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stderr]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stderr] 
[INFO] [stderr] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stderr]    --> /opt/rustwide/workdir/src/lib.rs:430:29
[INFO] [stderr]     |
[INFO] [stderr] 430 |         let mut foo = Some((box 42, [1, 2, 3]));
[INFO] [stderr]     |                             ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stderr]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stderr]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stderr] 
[INFO] [stderr] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stderr]    --> /opt/rustwide/workdir/src/lib.rs:446:20
[INFO] [stderr]     |
[INFO] [stderr] 446 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stderr]     |                    ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stderr]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stderr]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stderr] 
[INFO] [stderr] warning: box expression syntax is experimental; you can call `Box::new` instead
[INFO] [stderr]    --> /opt/rustwide/workdir/src/lib.rs:451:20
[INFO] [stderr]     |
[INFO] [stderr] 451 |         let foo = (box 42, [1, 2, 3]);
[INFO] [stderr]     |                    ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #49733 <https://github.com/rust-lang/rust/issues/49733> for more information
[INFO] [stderr]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stderr]     = note: for more information, see issue #65860 <https://github.com/rust-lang/rust/issues/65860>
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - (line 46) ... ok
[INFO] [stdout] test src/guard_unwrap.rs - guard_unwrap::guard_unwrap (line 16) ... ok
[INFO] [stdout] test src/lib.rs - (line 29) ... ok
[INFO] [stdout] test src/guard_unwrap.rs - guard_unwrap::guard_unwrap (line 24) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.63s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6b3d1a8d97bbb6bb9ba667503f7ab1f0ef7cf708fe4fe98d3a1bf8bfd1f7c57a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b3d1a8d97bbb6bb9ba667503f7ab1f0ef7cf708fe4fe98d3a1bf8bfd1f7c57a", kill_on_drop: false }`
[INFO] [stdout] 6b3d1a8d97bbb6bb9ba667503f7ab1f0ef7cf708fe4fe98d3a1bf8bfd1f7c57a
