[INFO] fetching crate mut_guard 0.1.0...
[INFO] testing mut_guard-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate mut_guard 0.1.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate mut_guard 0.1.0 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 crates.io crate mut_guard 0.1.0
[INFO] finished tweaking crates.io crate mut_guard 0.1.0
[INFO] tweaked toml for crates.io crate mut_guard 0.1.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] b5057cefb1ce165b3c15bb4a9a3a0b9e4791bf8cffab731ace22703a75d1676f
[INFO] running `Command { std: "docker" "start" "-a" "b5057cefb1ce165b3c15bb4a9a3a0b9e4791bf8cffab731ace22703a75d1676f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5057cefb1ce165b3c15bb4a9a3a0b9e4791bf8cffab731ace22703a75d1676f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5057cefb1ce165b3c15bb4a9a3a0b9e4791bf8cffab731ace22703a75d1676f", kill_on_drop: false }`
[INFO] [stdout] b5057cefb1ce165b3c15bb4a9a3a0b9e4791bf8cffab731ace22703a75d1676f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1aa1c7dcfa23335ea2ea5dfc37877c11eb69f1be998cdcbecc80e8a1d961247e
[INFO] running `Command { std: "docker" "start" "-a" "1aa1c7dcfa23335ea2ea5dfc37877c11eb69f1be998cdcbecc80e8a1d961247e", kill_on_drop: false }`
[INFO] [stderr]    Compiling mut_guard v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:211:12
[INFO] [stdout]     |
[INFO] [stdout] 211 |     f: Box<'a + FnMut(&mut T)>,
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn 'a + FnMut(&mut T)`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `Command { std: "docker" "inspect" "1aa1c7dcfa23335ea2ea5dfc37877c11eb69f1be998cdcbecc80e8a1d961247e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1aa1c7dcfa23335ea2ea5dfc37877c11eb69f1be998cdcbecc80e8a1d961247e", kill_on_drop: false }`
[INFO] [stdout] 1aa1c7dcfa23335ea2ea5dfc37877c11eb69f1be998cdcbecc80e8a1d961247e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 271b7fbb1f2493f1f4cf421de4f7f217e44f9dd4a33cb024324aa2be9e41124b
[INFO] running `Command { std: "docker" "start" "-a" "271b7fbb1f2493f1f4cf421de4f7f217e44f9dd4a33cb024324aa2be9e41124b", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:211:12
[INFO] [stdout]     |
[INFO] [stdout] 211 |     f: Box<'a + FnMut(&mut T)>,
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn 'a + FnMut(&mut T)`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling serde_json v1.0.67
[INFO] [stderr]    Compiling mut_guard v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lib.rs:211:12
[INFO] [stdout]     |
[INFO] [stdout] 211 |     f: Box<'a + FnMut(&mut T)>,
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn 'a + FnMut(&mut T)`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 8.83s
[INFO] running `Command { std: "docker" "inspect" "271b7fbb1f2493f1f4cf421de4f7f217e44f9dd4a33cb024324aa2be9e41124b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "271b7fbb1f2493f1f4cf421de4f7f217e44f9dd4a33cb024324aa2be9e41124b", kill_on_drop: false }`
[INFO] [stdout] 271b7fbb1f2493f1f4cf421de4f7f217e44f9dd4a33cb024324aa2be9e41124b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 036152c7e39cf66b553d28372566e96352dfb33326ee998c3201ba91dd412c9e
[INFO] running `Command { std: "docker" "start" "-a" "036152c7e39cf66b553d28372566e96352dfb33326ee998c3201ba91dd412c9e", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:211:12
[INFO] [stderr]     |
[INFO] [stderr] 211 |     f: Box<'a + FnMut(&mut T)>,
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn 'a + FnMut(&mut T)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: `mut_guard` (lib) generated 1 warning
[INFO] [stderr] warning: `mut_guard` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mut_guard-3d6bf0fcd486bac1)
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test tests::bank ... ok
[INFO] [stdout] test tests::count_access ... ok
[INFO] [stdout] test tests::less_than - should panic ... ok
[INFO] [stdout] test tests::invariant_bank - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mut_guard
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test src/lib.rs - (line 17) ... ok
[INFO] [stdout] test src/lib.rs - (line 57) ... ok
[INFO] [stdout] test src/lib.rs - (line 85) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.53s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "036152c7e39cf66b553d28372566e96352dfb33326ee998c3201ba91dd412c9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "036152c7e39cf66b553d28372566e96352dfb33326ee998c3201ba91dd412c9e", kill_on_drop: false }`
[INFO] [stdout] 036152c7e39cf66b553d28372566e96352dfb33326ee998c3201ba91dd412c9e