[INFO] fetching crate linkbot 0.0.2...
[INFO] building linkbot-0.0.2 against master#881c1ac408d93bb7adaa3a51dabab9266e82eee8 for issue-85264
[INFO] extracting crate linkbot 0.0.2 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate linkbot 0.0.2 on toolchain 881c1ac408d93bb7adaa3a51dabab9266e82eee8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate linkbot 0.0.2
[INFO] finished tweaking crates.io crate linkbot 0.0.2
[INFO] tweaked toml for crates.io crate linkbot 0.0.2 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "fetch" "--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5b37cbede353636c043f68a661be18cd20727fd665c69c53e3b5d10c572588a5
[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" "5b37cbede353636c043f68a661be18cd20727fd665c69c53e3b5d10c572588a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b37cbede353636c043f68a661be18cd20727fd665c69c53e3b5d10c572588a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b37cbede353636c043f68a661be18cd20727fd665c69c53e3b5d10c572588a5", kill_on_drop: false }`
[INFO] [stdout] 5b37cbede353636c043f68a661be18cd20727fd665c69c53e3b5d10c572588a5
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c4a46e3f5ffb3249a303bf2ddc70f1b09ad5494a2cb239050eef1bb6faaf064
[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" "0c4a46e3f5ffb3249a303bf2ddc70f1b09ad5494a2cb239050eef1bb6faaf064", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.95
[INFO] [stderr]    Compiling linkbot v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:65:27
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub type ButtonCallback = FnMut(Button, ButtonState, u32);
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(Button, ButtonState, u32)`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:326:41
[INFO] [stdout]     |
[INFO] [stdout] 326 | ...                   cb: extern fn(i32, i32, i32, *mut Inner),
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:327:47
[INFO] [stdout]     |
[INFO] [stdout] 327 | ...                   userdata: *mut Inner) -> i32;
[INFO] [stdout]     |                                 ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:329:42
[INFO] [stdout]     |
[INFO] [stdout] 329 | ...                   cb: Option<extern fn(i32, i32, i32, *mut Inner)>,
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:330:48
[INFO] [stdout]     |
[INFO] [stdout] 330 | ...                   userdata: *mut Inner) -> i32;
[INFO] [stdout]     |                                 ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.72s
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0c4a46e3f5ffb3249a303bf2ddc70f1b09ad5494a2cb239050eef1bb6faaf064", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c4a46e3f5ffb3249a303bf2ddc70f1b09ad5494a2cb239050eef1bb6faaf064", kill_on_drop: false }`
[INFO] [stdout] 0c4a46e3f5ffb3249a303bf2ddc70f1b09ad5494a2cb239050eef1bb6faaf064
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a27dde2804d797c031608dd992ebf4feb21d6e93f3ac349e74e1b68caf0091b3
[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" "a27dde2804d797c031608dd992ebf4feb21d6e93f3ac349e74e1b68caf0091b3", kill_on_drop: false }`
[INFO] [stderr]    Compiling linkbot v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:65:27
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub type ButtonCallback = FnMut(Button, ButtonState, u32);
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(Button, ButtonState, u32)`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:326:41
[INFO] [stdout]     |
[INFO] [stdout] 326 | ...                   cb: extern fn(i32, i32, i32, *mut Inner),
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:327:47
[INFO] [stdout]     |
[INFO] [stdout] 327 | ...                   userdata: *mut Inner) -> i32;
[INFO] [stdout]     |                                 ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:329:42
[INFO] [stdout]     |
[INFO] [stdout] 329 | ...                   cb: Option<extern fn(i32, i32, i32, *mut Inner)>,
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:330:48
[INFO] [stdout]     |
[INFO] [stdout] 330 | ...                   userdata: *mut Inner) -> i32;
[INFO] [stdout]     |                                 ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:65:27
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub type ButtonCallback = FnMut(Button, ButtonState, u32);
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(Button, ButtonState, u32)`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `button`
[INFO] [stdout]    --> src/lib.rs:342:32
[INFO] [stdout]     |
[INFO] [stdout] 342 |         l.set_button_handler( |button, state, timestamp| {
[INFO] [stdout]     |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_button`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `state`
[INFO] [stdout]    --> src/lib.rs:342:40
[INFO] [stdout]     |
[INFO] [stdout] 342 |         l.set_button_handler( |button, state, timestamp| {
[INFO] [stdout]     |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_state`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `timestamp`
[INFO] [stdout]    --> src/lib.rs:342:47
[INFO] [stdout]     |
[INFO] [stdout] 342 |         l.set_button_handler( |button, state, timestamp| {
[INFO] [stdout]     |                                               ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_timestamp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:326:41
[INFO] [stdout]     |
[INFO] [stdout] 326 | ...                   cb: extern fn(i32, i32, i32, *mut Inner),
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:327:47
[INFO] [stdout]     |
[INFO] [stdout] 327 | ...                   userdata: *mut Inner) -> i32;
[INFO] [stdout]     |                                 ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:329:42
[INFO] [stdout]     |
[INFO] [stdout] 329 | ...                   cb: Option<extern fn(i32, i32, i32, *mut Inner)>,
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:330:48
[INFO] [stdout]     |
[INFO] [stdout] 330 | ...                   userdata: *mut Inner) -> i32;
[INFO] [stdout]     |                                 ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:342:9
[INFO] [stdout]     |
[INFO] [stdout] 342 | /         l.set_button_handler( |button, state, timestamp| {
[INFO] [stdout] 343 | |             println!("Button press!");
[INFO] [stdout] 344 | |         });
[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 `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:347:9
[INFO] [stdout]     |
[INFO] [stdout] 347 |         l.move_motors(7, 90.0, 90.0, 90.0);
[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 `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:348:9
[INFO] [stdout]     |
[INFO] [stdout] 348 |         l.move_wait(7);
[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 `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:349:9
[INFO] [stdout]     |
[INFO] [stdout] 349 |         l.move_motors(7, -90.0, -90.0, -90.0);
[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 `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:350:9
[INFO] [stdout]     |
[INFO] [stdout] 350 |         l.move_wait(7);
[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 `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:351:9
[INFO] [stdout]     |
[INFO] [stdout] 351 |         l.unset_button_handler();
[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 `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:352:9
[INFO] [stdout]     |
[INFO] [stdout] 352 |         l.set_buzzer_frequency(440.0);
[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 `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:354:9
[INFO] [stdout]     |
[INFO] [stdout] 354 |         l.set_buzzer_frequency(0.0);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-m64" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-Wl,--as-needed" "-L" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.linkbot.eospl8fw-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa" "/opt/rustwide/target/debug/deps/linkbot-9918b9d530d0fafa.30xuz0fv5ync14l7.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-llinkbot" "-Wl,-Bstatic" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-e0d08a82dcb7da7b.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libterm-24036eb8e889985c.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-759d40b5d9a6a451.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-7590543c881e6235.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_std-56b60793e4f96438.rlib" "/opt/rustwide/target/debug/deps/liblibc-2eeb146fbbc48d30.rlib" "-Wl,--start-group" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-c6dddd3d354e6bea.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-c2ca47afdcc5e309.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-b47be2942017e108.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-20a1e49116ab0df9.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-25e09d9868291683.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-9c99fb6e5ca5159e.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-85040d7563599960.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-0e4f7587da8acf20.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-7be0a6711ed15b5c.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-00672fabc4ff9c9d.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-72fe231ef0473d15.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-019d54ecc304b655.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-cc7d9343e4f608be.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-e41c6d24baeb2249.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-9849bb0fbad7f0f5.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-a1fd7734706d5518.rlib" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-c8ded1707ad10767.rlib" "-Wl,--end-group" "/opt/rustwide/rustup-home/toolchains/881c1ac408d93bb7adaa3a51dabab9266e82eee8/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-8b33f9cbbc9652fe.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc"
[INFO] [stdout]   = note: /usr/bin/ld: cannot find -llinkbot
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `linkbot`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "a27dde2804d797c031608dd992ebf4feb21d6e93f3ac349e74e1b68caf0091b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a27dde2804d797c031608dd992ebf4feb21d6e93f3ac349e74e1b68caf0091b3", kill_on_drop: false }`
[INFO] [stdout] a27dde2804d797c031608dd992ebf4feb21d6e93f3ac349e74e1b68caf0091b3
