[INFO] fetching crate take_mut 0.2.2...
[INFO] checking take_mut-0.2.2 against beta for pr-78714
[INFO] extracting crate take_mut 0.2.2 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate take_mut 0.2.2 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate take_mut 0.2.2
[INFO] finished tweaking crates.io crate take_mut 0.2.2
[INFO] tweaked toml for crates.io crate take_mut 0.2.2 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2daa2f0f7b383e70d478b740d28f85a8944d31a3ad23cce2a5127f325ab52387
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2daa2f0f7b383e70d478b740d28f85a8944d31a3ad23cce2a5127f325ab52387", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2daa2f0f7b383e70d478b740d28f85a8944d31a3ad23cce2a5127f325ab52387", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2daa2f0f7b383e70d478b740d28f85a8944d31a3ad23cce2a5127f325ab52387", kill_on_drop: false }`
[INFO] [stdout] 2daa2f0f7b383e70d478b740d28f85a8944d31a3ad23cce2a5127f325ab52387
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 83ddc0ca6b226539b678dabd7eb511e5933d2070b70202213f36be6000475b3d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "83ddc0ca6b226539b678dabd7eb511e5933d2070b70202213f36be6000475b3d", kill_on_drop: false }`
[INFO] [stderr]     Checking take_mut v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/lib.rs:141:13
[INFO] [stdout]     |
[INFO] [stdout] 140 |             panic!("panic");
[INFO] [stdout]     |             ---------------- any code following this expression is unreachable
[INFO] [stdout] 141 |             Foo::B
[INFO] [stdout]     |             ^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/scoped.rs:153:14
[INFO] [stdout]     |
[INFO] [stdout] 153 |         let (a, a_hole) = scope.take(&mut bar.a);
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/scoped.rs:154:14
[INFO] [stdout]     |
[INFO] [stdout] 154 |         let (b, b_hole) = scope.take(&mut bar.b);
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/scoped.rs:170:18
[INFO] [stdout]     |
[INFO] [stdout] 170 |             let (t, hole) = scope.take_or_recover(&mut foo, || Foo);
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hole`
[INFO] [stdout]    --> src/scoped.rs:170:21
[INFO] [stdout]     |
[INFO] [stdout] 170 |             let (t, hole) = scope.take_or_recover(&mut foo, || Foo);
[INFO] [stdout]     |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_hole`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.61s
[INFO] running `Command { std: "docker" "inspect" "83ddc0ca6b226539b678dabd7eb511e5933d2070b70202213f36be6000475b3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83ddc0ca6b226539b678dabd7eb511e5933d2070b70202213f36be6000475b3d", kill_on_drop: false }`
[INFO] [stdout] 83ddc0ca6b226539b678dabd7eb511e5933d2070b70202213f36be6000475b3d