[INFO] fetching crate namespaces-rs 0.1.1...
[INFO] checking namespaces-rs-0.1.1 against beta for pr-78714
[INFO] extracting crate namespaces-rs 0.1.1 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate namespaces-rs 0.1.1 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 namespaces-rs 0.1.1
[INFO] finished tweaking crates.io crate namespaces-rs 0.1.1
[INFO] tweaked toml for crates.io crate namespaces-rs 0.1.1 written to /workspace/builds/worker-13/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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 07085ab747d84161baf0ab810faf509bc68c53f4e730f22b4b75ecb815c0a567
[INFO] running `Command { std: "docker" "start" "-a" "07085ab747d84161baf0ab810faf509bc68c53f4e730f22b4b75ecb815c0a567", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07085ab747d84161baf0ab810faf509bc68c53f4e730f22b4b75ecb815c0a567", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07085ab747d84161baf0ab810faf509bc68c53f4e730f22b4b75ecb815c0a567", kill_on_drop: false }`
[INFO] [stdout] 07085ab747d84161baf0ab810faf509bc68c53f4e730f22b4b75ecb815c0a567
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] ec21078baab626ada3c190ff7d3a999a58b2f38f0ac2f05db783c7e08c8ffa52
[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" "ec21078baab626ada3c190ff7d3a999a58b2f38f0ac2f05db783c7e08c8ffa52", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking serde_json v1.0.59
[INFO] [stderr]     Checking ipc-channel v0.14.1
[INFO] [stderr]     Checking namespaces-rs v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]   --> src/advanced.rs:15:41
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Ok(unistd::ForkResult::Parent { child, .. }) => {
[INFO] [stdout]    |                                         ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]   --> src/advanced.rs:43:41
[INFO] [stdout]    |
[INFO] [stdout] 43 |         Ok(unistd::ForkResult::Parent { child, .. }) => {
[INFO] [stdout]    |                                         ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]   --> src/advanced.rs:15:41
[INFO] [stdout]    |
[INFO] [stdout] 15 |         Ok(unistd::ForkResult::Parent { child, .. }) => {
[INFO] [stdout]    |                                         ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]   --> src/advanced.rs:43:41
[INFO] [stdout]    |
[INFO] [stdout] 43 |         Ok(unistd::ForkResult::Parent { child, .. }) => {
[INFO] [stdout]    |                                         ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/advanced.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |             tx.send(f());
[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` that must be used
[INFO] [stdout]   --> src/advanced.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |             tx.send(res);
[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` that must be used
[INFO] [stdout]   --> src/advanced.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |             tx.send(f());
[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` that must be used
[INFO] [stdout]   --> src/advanced.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |             tx.send(res);
[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: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.76s
[INFO] running `Command { std: "docker" "inspect" "ec21078baab626ada3c190ff7d3a999a58b2f38f0ac2f05db783c7e08c8ffa52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec21078baab626ada3c190ff7d3a999a58b2f38f0ac2f05db783c7e08c8ffa52", kill_on_drop: false }`
[INFO] [stdout] ec21078baab626ada3c190ff7d3a999a58b2f38f0ac2f05db783c7e08c8ffa52