[INFO] fetching crate middleman 0.3.1...
[INFO] checking middleman-0.3.1 against beta for pr-78714
[INFO] extracting crate middleman 0.3.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate middleman 0.3.1 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 middleman 0.3.1
[INFO] finished tweaking crates.io crate middleman 0.3.1
[INFO] tweaked toml for crates.io crate middleman 0.3.1 written to /workspace/builds/worker-8/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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d69eff383ca3133f7453b095a457da23dc0fbf92c7b41b901ea51de9a2e8b5f8
[INFO] running `Command { std: "docker" "start" "-a" "d69eff383ca3133f7453b095a457da23dc0fbf92c7b41b901ea51de9a2e8b5f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d69eff383ca3133f7453b095a457da23dc0fbf92c7b41b901ea51de9a2e8b5f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d69eff383ca3133f7453b095a457da23dc0fbf92c7b41b901ea51de9a2e8b5f8", kill_on_drop: false }`
[INFO] [stdout] d69eff383ca3133f7453b095a457da23dc0fbf92c7b41b901ea51de9a2e8b5f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 03f7001c3b608b921ef462ec5db241fdb67a693181f6b0a2dd35f0a602bc8fb0
[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" "03f7001c3b608b921ef462ec5db241fdb67a693181f6b0a2dd35f0a602bc8fb0", kill_on_drop: false }`
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking middleman v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/structs.rs:313:18
[INFO] [stdout]     |
[INFO] [stdout] 313 |                 let mut vec = self.buf.drain(0..buf_end)
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/structs.rs:313:18
[INFO] [stdout]     |
[INFO] [stdout] 313 |                 let mut vec = self.buf.drain(0..buf_end)
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/tests.rs:532:41
[INFO] [stdout]     |
[INFO] [stdout] 532 | ...                   let mut stream = streams.get_mut(&token).unwrap();
[INFO] [stdout]     |                           ----^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` in tuple element 1 that must be used
[INFO] [stdout]    --> src/tests.rs:226:28
[INFO] [stdout]     |
[INFO] [stdout] 226 |                 TOK_A => { a.recv_all_map(&mut work); },
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` in tuple element 1 that must be used
[INFO] [stdout]    --> src/tests.rs:227:28
[INFO] [stdout]     |
[INFO] [stdout] 227 |                 TOK_B => { b.recv_all_map(&mut work); },
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` in tuple element 1 that must be used
[INFO] [stdout]    --> src/tests.rs:344:13
[INFO] [stdout]     |
[INFO] [stdout] 344 | /             a.recv_all_map::<_, Complex>(|_mm, msg| {
[INFO] [stdout] 345 | |                 assert_eq!(&msg, &struct_form);
[INFO] [stdout] 346 | |                 to_go -= 1;
[INFO] [stdout] 347 | |             });
[INFO] [stdout]     | |_______________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.85s
[INFO] running `Command { std: "docker" "inspect" "03f7001c3b608b921ef462ec5db241fdb67a693181f6b0a2dd35f0a602bc8fb0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03f7001c3b608b921ef462ec5db241fdb67a693181f6b0a2dd35f0a602bc8fb0", kill_on_drop: false }`
[INFO] [stdout] 03f7001c3b608b921ef462ec5db241fdb67a693181f6b0a2dd35f0a602bc8fb0