[INFO] fetching crate gdb_probe 0.1.2...
[INFO] checking gdb_probe-0.1.2 against master#4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5 for pr-81174
[INFO] extracting crate gdb_probe 0.1.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate gdb_probe 0.1.2 on toolchain 4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate gdb_probe 0.1.2
[INFO] finished tweaking crates.io crate gdb_probe 0.1.2
[INFO] tweaked toml for crates.io crate gdb_probe 0.1.2 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "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] 05f60210205b2e1257bedf84b298eba7f62b3f958bc7adb63e61c1eb4152a879
[INFO] running `Command { std: "docker" "start" "-a" "05f60210205b2e1257bedf84b298eba7f62b3f958bc7adb63e61c1eb4152a879", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05f60210205b2e1257bedf84b298eba7f62b3f958bc7adb63e61c1eb4152a879", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05f60210205b2e1257bedf84b298eba7f62b3f958bc7adb63e61c1eb4152a879", kill_on_drop: false }`
[INFO] [stdout] 05f60210205b2e1257bedf84b298eba7f62b3f958bc7adb63e61c1eb4152a879
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] cc761d193ee1f3437f60b9bc7f1f52f2d888ad6fc127c1ce6dc58ca9ae4d545c
[INFO] running `Command { std: "docker" "start" "-a" "cc761d193ee1f3437f60b9bc7f1f52f2d888ad6fc127c1ce6dc58ca9ae4d545c", kill_on_drop: false }`
[INFO] [stderr]    Compiling nix v0.13.1
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking gdb_probe v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]  --> src/lib.rs:9:32
[INFO] [stdout]   |
[INFO] [stdout] 9 |        Ok(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/lib.rs:9:32
[INFO] [stdout]   |
[INFO] [stdout] 9 |        Ok(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: `x`
[INFO] [stdout]   --> src/lib.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let x = 3+4;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/lib.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |            kill(getpid(), Signal::SIGSTOP );
[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: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/lib.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |            kill(getpid(), Signal::SIGSTOP );
[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: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.68s
[INFO] running `Command { std: "docker" "inspect" "cc761d193ee1f3437f60b9bc7f1f52f2d888ad6fc127c1ce6dc58ca9ae4d545c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc761d193ee1f3437f60b9bc7f1f52f2d888ad6fc127c1ce6dc58ca9ae4d545c", kill_on_drop: false }`
[INFO] [stdout] cc761d193ee1f3437f60b9bc7f1f52f2d888ad6fc127c1ce6dc58ca9ae4d545c