[INFO] fetching crate mac-sys-info 0.1.6...
[INFO] checking mac-sys-info-0.1.6 against master#b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18 for pr-79470
[INFO] extracting crate mac-sys-info 0.1.6 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate mac-sys-info 0.1.6 on toolchain b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mac-sys-info 0.1.6
[INFO] finished tweaking crates.io crate mac-sys-info 0.1.6
[INFO] tweaked toml for crates.io crate mac-sys-info 0.1.6 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate mac-sys-info 0.1.6 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1369f39e1fe334547e39919c929d586e7338286fe9511806b4f525e04416d2cb
[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" "1369f39e1fe334547e39919c929d586e7338286fe9511806b4f525e04416d2cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1369f39e1fe334547e39919c929d586e7338286fe9511806b4f525e04416d2cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1369f39e1fe334547e39919c929d586e7338286fe9511806b4f525e04416d2cb", kill_on_drop: false }`
[INFO] [stdout] 1369f39e1fe334547e39919c929d586e7338286fe9511806b4f525e04416d2cb
[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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c3e75d42faaf069a7f02662fa5c0cf5e533f1046934e2ec92c70ef564c07d8fa
[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" "c3e75d42faaf069a7f02662fa5c0cf5e533f1046934e2ec92c70ef564c07d8fa", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.51
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking errno v0.2.7
[INFO] [stderr]     Checking log v0.4.11
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking regex v1.4.2
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking env_logger v0.8.2
[INFO] [stderr]    Compiling derive_more v0.99.11
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]     Checking unix-exec-output-catcher v0.2.0
[INFO] [stderr]     Checking serde v1.0.117
[INFO] [stderr]     Checking mac-sys-info v0.1.6 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `Try`)
[INFO] [stdout]   --> src/lib.rs:77:20
[INFO] [stdout]    |
[INFO] [stdout] 76 | /     fn test_get_sys_info() {
[INFO] [stdout] 77 | |         let _res = get_mac_sys_info()?;
[INFO] [stdout]    | |                    ^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] 78 | |     }
[INFO] [stdout]    | |_____- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `Try` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mac-sys-info`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c3e75d42faaf069a7f02662fa5c0cf5e533f1046934e2ec92c70ef564c07d8fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3e75d42faaf069a7f02662fa5c0cf5e533f1046934e2ec92c70ef564c07d8fa", kill_on_drop: false }`
[INFO] [stdout] c3e75d42faaf069a7f02662fa5c0cf5e533f1046934e2ec92c70ef564c07d8fa