[INFO] crate libsweep 1.0.1 is already in cache
[INFO] testing libsweep-1.0.1 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate libsweep 1.0.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate libsweep 1.0.1 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate libsweep 1.0.1
[INFO] finished tweaking crates.io crate libsweep 1.0.1
[INFO] tweaked toml for crates.io crate libsweep 1.0.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6455504c59eaec1416a96efb3647a1d4bde0d3cd5cd393011235fda0d2a98a1c
[INFO] running `"docker" "start" "-a" "6455504c59eaec1416a96efb3647a1d4bde0d3cd5cd393011235fda0d2a98a1c"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libsweep v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]  --> src/lib.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | use libc::{int32_t};
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:21:31
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn sweep_get_version() -> int32_t;
[INFO] [stderr]    |                               ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:26:69
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn sweep_device_set_motor_speed(device: *const SweepDevice, hz: int32_t, error: *const *mut SweepError);
[INFO] [stderr]    |                                                                     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:27:99
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn sweep_device_get_motor_speed(device: *const SweepDevice, error: *const *mut SweepError) -> int32_t;
[INFO] [stderr]    |                                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:28:99
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn sweep_device_get_sample_rate(device: *const SweepDevice, error: *const *mut SweepError) -> int32_t;
[INFO] [stderr]    |                                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:30:68
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn sweep_scan_get_number_of_samples(scan: *const SweepScan) -> int32_t;
[INFO] [stderr]    |                                                                    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:31:61
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn sweep_scan_get_angle(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:31:73
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn sweep_scan_get_angle(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:32:64
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn sweep_scan_get_distance(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:32:76
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn sweep_scan_get_distance(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:33:71
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn sweep_scan_get_signal_strength(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                       ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:33:83
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn sweep_scan_get_signal_strength(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:64:29
[INFO] [stderr]    |
[INFO] [stderr] 64 |     pub fn get_version() -> int32_t {
[INFO] [stderr]    |                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:76:48
[INFO] [stderr]    |
[INFO] [stderr] 76 |     pub fn set_motor_speed(&self, speed_hertz: int32_t) -> Result<(), String> {
[INFO] [stderr]    |                                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:88:45
[INFO] [stderr]    |
[INFO] [stderr] 88 |     pub fn get_motor_speed(&self) -> Result<int32_t, String> {
[INFO] [stderr]    |                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]    --> src/lib.rs:100:45
[INFO] [stderr]     |
[INFO] [stderr] 100 |     pub fn get_sample_rate(&self) -> Result<int32_t, String> {
[INFO] [stderr]     |                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 16 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `"docker" "inspect" "6455504c59eaec1416a96efb3647a1d4bde0d3cd5cd393011235fda0d2a98a1c"`
[INFO] running `"docker" "rm" "-f" "6455504c59eaec1416a96efb3647a1d4bde0d3cd5cd393011235fda0d2a98a1c"`
[INFO] [stdout] 6455504c59eaec1416a96efb3647a1d4bde0d3cd5cd393011235fda0d2a98a1c
[INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4d30015916e871ef285ee98b542aaef5611bc39c406006b1b9f6203144895aa0
[INFO] running `"docker" "start" "-a" "4d30015916e871ef285ee98b542aaef5611bc39c406006b1b9f6203144895aa0"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libsweep v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]  --> src/lib.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | use libc::{int32_t};
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:21:31
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn sweep_get_version() -> int32_t;
[INFO] [stderr]    |                               ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:26:69
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn sweep_device_set_motor_speed(device: *const SweepDevice, hz: int32_t, error: *const *mut SweepError);
[INFO] [stderr]    |                                                                     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:27:99
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn sweep_device_get_motor_speed(device: *const SweepDevice, error: *const *mut SweepError) -> int32_t;
[INFO] [stderr]    |                                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:28:99
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn sweep_device_get_sample_rate(device: *const SweepDevice, error: *const *mut SweepError) -> int32_t;
[INFO] [stderr]    |                                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:30:68
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn sweep_scan_get_number_of_samples(scan: *const SweepScan) -> int32_t;
[INFO] [stderr]    |                                                                    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:31:61
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn sweep_scan_get_angle(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:31:73
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn sweep_scan_get_angle(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:32:64
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn sweep_scan_get_distance(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:32:76
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn sweep_scan_get_distance(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:33:71
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn sweep_scan_get_signal_strength(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                       ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:33:83
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn sweep_scan_get_signal_strength(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:64:29
[INFO] [stderr]    |
[INFO] [stderr] 64 |     pub fn get_version() -> int32_t {
[INFO] [stderr]    |                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:76:48
[INFO] [stderr]    |
[INFO] [stderr] 76 |     pub fn set_motor_speed(&self, speed_hertz: int32_t) -> Result<(), String> {
[INFO] [stderr]    |                                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:88:45
[INFO] [stderr]    |
[INFO] [stderr] 88 |     pub fn get_motor_speed(&self) -> Result<int32_t, String> {
[INFO] [stderr]    |                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]    --> src/lib.rs:100:45
[INFO] [stderr]     |
[INFO] [stderr] 100 |     pub fn get_sample_rate(&self) -> Result<int32_t, String> {
[INFO] [stderr]     |                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 16 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]  --> src/lib.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | use libc::{int32_t};
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:21:31
[INFO] [stderr]    |
[INFO] [stderr] 21 |     fn sweep_get_version() -> int32_t;
[INFO] [stderr]    |                               ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:26:69
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn sweep_device_set_motor_speed(device: *const SweepDevice, hz: int32_t, error: *const *mut SweepError);
[INFO] [stderr]    |                                                                     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:27:99
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn sweep_device_get_motor_speed(device: *const SweepDevice, error: *const *mut SweepError) -> int32_t;
[INFO] [stderr]    |                                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:28:99
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn sweep_device_get_sample_rate(device: *const SweepDevice, error: *const *mut SweepError) -> int32_t;
[INFO] [stderr]    |                                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:30:68
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn sweep_scan_get_number_of_samples(scan: *const SweepScan) -> int32_t;
[INFO] [stderr]    |                                                                    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:31:61
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn sweep_scan_get_angle(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:31:73
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn sweep_scan_get_angle(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:32:64
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn sweep_scan_get_distance(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:32:76
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn sweep_scan_get_distance(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:33:71
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn sweep_scan_get_signal_strength(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                       ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:33:83
[INFO] [stderr]    |
[INFO] [stderr] 33 |     fn sweep_scan_get_signal_strength(scan: *const SweepScan, sample: int32_t) -> int32_t;
[INFO] [stderr]    |                                                                                   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:64:29
[INFO] [stderr]    |
[INFO] [stderr] 64 |     pub fn get_version() -> int32_t {
[INFO] [stderr]    |                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:76:48
[INFO] [stderr]    |
[INFO] [stderr] 76 |     pub fn set_motor_speed(&self, speed_hertz: int32_t) -> Result<(), String> {
[INFO] [stderr]    |                                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]   --> src/lib.rs:88:45
[INFO] [stderr]    |
[INFO] [stderr] 88 |     pub fn get_motor_speed(&self) -> Result<int32_t, String> {
[INFO] [stderr]    |                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'libc::int32_t': Use i32 instead.
[INFO] [stderr]    --> src/lib.rs:100:45
[INFO] [stderr]     |
[INFO] [stderr] 100 |     pub fn get_sample_rate(&self) -> Result<int32_t, String> {
[INFO] [stderr]     |                                             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: linking with `cc` failed: exit code: 1
[INFO] [stderr]   |
[INFO] [stderr]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.0.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.1.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.10.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.11.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.12.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.13.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.14.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.15.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.2.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.3.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.4.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.5.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.6.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.7.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.8.rcgu.o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.scan.6dl6rtde-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/examples/scan-41c185194711468c" "/opt/rustwide/target/debug/examples/scan-41c185194711468c.1h0jfrjphkbrqm4h.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/liblibsweep-8ca74d3de1a8598a.rlib" "/opt/rustwide/target/debug/deps/liblibc-2e17c5c99334ee98.rlib" "-Wl,--start-group" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-44f8eb3d0b2fad61.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-abc626f09920d361.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-546e83c8973f1a65.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-12768dfc68674934.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-e06867e4497f2ee8.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-cbc579f43f6df57b.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-7abd6d5a7ebf9a23.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-46423c7bc03bd327.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-fc3773ed7bc68f07.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-9cdc98176efd27e2.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-02d88502a763e06b.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-8cdc9d38dd6cd3ce.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-336f7d63e72901ef.rlib" "-Wl,--end-group" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-57917b1be5233117.rlib" "-Wl,-Bdynamic" "-lsweep" "-lutil" "-ldl" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-ldl" "-lutil"
[INFO] [stderr]   = note: /usr/bin/ld: cannot find -lsweep
[INFO] [stderr]           collect2: error: ld returned 1 exit status
[INFO] [stderr]           
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `libsweep`.
[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: linking with `cc` failed: exit code: 1
[INFO] [stderr]   |
[INFO] [stderr]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.libsweep.2423kuyh-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c" "/opt/rustwide/target/debug/deps/libsweep-6fe336006df6db8c.4xg902kie0txv8h1.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-lsweep" "-Wl,-Bstatic" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-0a07979da1fa7aa2.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libterm-171ede43b21d034c.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-ea69ac8b5a0936d1.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-6be6d4d5d08eb152.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_std-c718480fe68c7cec.rlib" "/opt/rustwide/target/debug/deps/liblibc-2e17c5c99334ee98.rlib" "-Wl,--start-group" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-44f8eb3d0b2fad61.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-abc626f09920d361.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-546e83c8973f1a65.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-12768dfc68674934.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-e06867e4497f2ee8.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-cbc579f43f6df57b.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-7abd6d5a7ebf9a23.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-46423c7bc03bd327.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-fc3773ed7bc68f07.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-9cdc98176efd27e2.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-02d88502a763e06b.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-8cdc9d38dd6cd3ce.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-336f7d63e72901ef.rlib" "-Wl,--end-group" "/opt/rustwide/rustup-home/toolchains/beta-2020-06-03-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-57917b1be5233117.rlib" "-Wl,-Bdynamic" "-lutil" "-ldl" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-ldl" "-lutil"
[INFO] [stderr]   = note: /usr/bin/ld: cannot find -lsweep
[INFO] [stderr]           collect2: error: ld returned 1 exit status
[INFO] [stderr]           
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 16 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4d30015916e871ef285ee98b542aaef5611bc39c406006b1b9f6203144895aa0"`
[INFO] running `"docker" "rm" "-f" "4d30015916e871ef285ee98b542aaef5611bc39c406006b1b9f6203144895aa0"`
[INFO] [stdout] 4d30015916e871ef285ee98b542aaef5611bc39c406006b1b9f6203144895aa0