[INFO] updating cached repository wilsoniya/spectralizer-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/wilsoniya/spectralizer-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/wilsoniya/spectralizer-rs" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/wilsoniya/spectralizer-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/wilsoniya/spectralizer-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/wilsoniya/spectralizer-rs" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/wilsoniya/spectralizer-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/wilsoniya/spectralizer-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6e6baaeaa5aa71e4b1f87ee625a4893811284684
[INFO] sha for GitHub repo wilsoniya/spectralizer-rs: 6e6baaeaa5aa71e4b1f87ee625a4893811284684
[INFO] validating manifest of wilsoniya/spectralizer-rs on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of wilsoniya/spectralizer-rs on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing wilsoniya/spectralizer-rs
[INFO] finished frobbing wilsoniya/spectralizer-rs
[INFO] frobbed toml for wilsoniya/spectralizer-rs written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/wilsoniya/spectralizer-rs/Cargo.toml
[INFO] started frobbing wilsoniya/spectralizer-rs
[INFO] finished frobbing wilsoniya/spectralizer-rs
[INFO] frobbed toml for wilsoniya/spectralizer-rs written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/wilsoniya/spectralizer-rs/Cargo.toml
[INFO] crate wilsoniya/spectralizer-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking wilsoniya/spectralizer-rs against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-1/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/wilsoniya/spectralizer-rs:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 9d617ced15013d4f6ebd670b3c1678f08997adcba9c79bca01412d631f69f90c
[INFO] running `"docker" "start" "-a" "9d617ced15013d4f6ebd670b3c1678f08997adcba9c79bca01412d631f69f90c"`
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking sdl2-sys v0.32.6
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking num-iter v0.1.37
[INFO] [stderr]     Checking num-bigint v0.2.2
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking sdl2 v0.32.2
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking spectralizer-rs v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: type `pa_simple` should have an upper camel case name
[INFO] [stderr]   --> src/pulse.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct pa_simple;
[INFO] [stderr]    |        ^^^^^^^^^ help: convert the identifier to upper camel case: `PaSimple`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `pa_sample_spec` should have an upper camel case name
[INFO] [stderr]   --> src/pulse.rs:38:8
[INFO] [stderr]    |
[INFO] [stderr] 38 | struct pa_sample_spec {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `PaSampleSpec`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `sdl2::keyboard::Keycode`
[INFO] [stderr]   --> src/vis.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use sdl2::keyboard::Keycode;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `pa_simple` should have an upper camel case name
[INFO] [stderr]   --> src/pulse.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct pa_simple;
[INFO] [stderr]    |        ^^^^^^^^^ help: convert the identifier to upper camel case: `PaSimple`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `pa_sample_spec` should have an upper camel case name
[INFO] [stderr]   --> src/pulse.rs:38:8
[INFO] [stderr]    |
[INFO] [stderr] 38 | struct pa_sample_spec {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `PaSampleSpec`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `sdl2::keyboard::Keycode`
[INFO] [stderr]   --> src/vis.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use sdl2::keyboard::Keycode;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `frame_start_ns` is never read
[INFO] [stderr]   --> src/main.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let mut frame_start_ns: u64 = 0;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `sample_rate`
[INFO] [stderr]   --> src/pulse.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     sample_rate: usize,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `format`
[INFO] [stderr]   --> src/pulse.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     format: c_int,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `rate`
[INFO] [stderr]   --> src/pulse.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     rate: u32,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `channels`
[INFO] [stderr]   --> src/pulse.rs:41:5
[INFO] [stderr]    |
[INFO] [stderr] 41 |     channels: u8
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `PA_STREAM_NODIRECTION`
[INFO] [stderr]   --> src/pulse.rs:48:1
[INFO] [stderr]    |
[INFO] [stderr] 48 | static PA_STREAM_NODIRECTION: c_int = 0_i32;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `PA_STREAM_PLAYBACK`
[INFO] [stderr]   --> src/pulse.rs:49:1
[INFO] [stderr]    |
[INFO] [stderr] 49 | static PA_STREAM_PLAYBACK:    c_int = 1_i32;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `PA_STREAM_UPLOAD`
[INFO] [stderr]   --> src/pulse.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | static PA_STREAM_UPLOAD:      c_int = 3_i32;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `SpectralizerError`
[INFO] [stderr]  --> src/errors.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub enum SpectralizerError {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `pulse::pa_sample_spec` which is not FFI-safe: this struct has unspecified layout
[INFO] [stderr]   --> src/pulse.rs:16:35
[INFO] [stderr]    |
[INFO] [stderr] 16 |                      sample_spec: *mut pa_sample_spec,
[INFO] [stderr]    |                                   ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stderr]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/pulse.rs:38:1
[INFO] [stderr]    |
[INFO] [stderr] 38 | / struct pa_sample_spec {
[INFO] [stderr] 39 | |     format: c_int,
[INFO] [stderr] 40 | |     rate: u32,
[INFO] [stderr] 41 | |     channels: u8
[INFO] [stderr] 42 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `pulse::pa_simple` which is not FFI-safe: this struct has unspecified layout
[INFO] [stderr]   --> src/pulse.rs:19:44
[INFO] [stderr]    |
[INFO] [stderr] 19 |                      error: *mut c_int) -> *mut pa_simple;
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/pulse.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct pa_simple;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `pulse::pa_simple` which is not FFI-safe: this struct has unspecified layout
[INFO] [stderr]   --> src/pulse.rs:20:27
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn pa_simple_read(pa: *mut pa_simple,
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/pulse.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct pa_simple;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `pulse::pa_simple` which is not FFI-safe: this struct has unspecified layout
[INFO] [stderr]   --> src/pulse.rs:25:28
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn pa_simple_flush(pa: *mut pa_simple, error: *mut c_int) -> c_int;
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/pulse.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct pa_simple;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:12:28
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub fn real_fft(x: &[f64], X: &mut [f64]) {
[INFO] [stderr]    |                            ^ help: convert the identifier to snake case: `x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `N` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let N = x.len();
[INFO] [stderr]    |         ^ help: convert the identifier to snake case: `n`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Nf` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let Nf = N as f64 - 1.0;
[INFO] [stderr]    |         ^^ help: convert the identifier to snake case: `nf`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `N` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let N = x.len();
[INFO] [stderr]    |         ^ help: convert the identifier to snake case: `n`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Nf` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |     let Nf = N as f64;
[INFO] [stderr]    |         ^^ help: convert the identifier to snake case: `nf`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |     let mut X: Vec<Complex<f64>> = vec![Complex::new(0.0, 0.0); N];
[INFO] [stderr]    |             ^ help: convert the identifier to snake case: `x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X_even` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |         let X_even = ditfft2(&evens[..]);
[INFO] [stderr]    |             ^^^^^^ help: convert the identifier to snake case: `x_even`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X_odd` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:74:13
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let X_odd = ditfft2(&odds[..]);
[INFO] [stderr]    |             ^^^^^ help: convert the identifier to snake case: `x_odd`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/vis.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |         self.canvas.set_scale(self.scale_x, self.scale_y);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/vis.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 | /         self.canvas.fill_rect(Rect::new(0, 0, self.win_width,
[INFO] [stderr] 66 | |                                                      self.win_height));
[INFO] [stderr]    | |_______________________________________________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/vis.rs:88:13
[INFO] [stderr]    |
[INFO] [stderr] 88 |             self.canvas.fill_rect(rect);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `frame_start_ns` is never read
[INFO] [stderr]   --> src/main.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let mut frame_start_ns: u64 = 0;
[INFO] [stderr]    |             ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `sample_rate`
[INFO] [stderr]   --> src/pulse.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     sample_rate: usize,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `format`
[INFO] [stderr]   --> src/pulse.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     format: c_int,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `rate`
[INFO] [stderr]   --> src/pulse.rs:40:5
[INFO] [stderr]    |
[INFO] [stderr] 40 |     rate: u32,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `channels`
[INFO] [stderr]   --> src/pulse.rs:41:5
[INFO] [stderr]    |
[INFO] [stderr] 41 |     channels: u8
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `PA_STREAM_NODIRECTION`
[INFO] [stderr]   --> src/pulse.rs:48:1
[INFO] [stderr]    |
[INFO] [stderr] 48 | static PA_STREAM_NODIRECTION: c_int = 0_i32;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `PA_STREAM_PLAYBACK`
[INFO] [stderr]   --> src/pulse.rs:49:1
[INFO] [stderr]    |
[INFO] [stderr] 49 | static PA_STREAM_PLAYBACK:    c_int = 1_i32;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `PA_STREAM_UPLOAD`
[INFO] [stderr]   --> src/pulse.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | static PA_STREAM_UPLOAD:      c_int = 3_i32;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `SpectralizerError`
[INFO] [stderr]  --> src/errors.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub enum SpectralizerError {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `pulse::pa_sample_spec` which is not FFI-safe: this struct has unspecified layout
[INFO] [stderr]   --> src/pulse.rs:16:35
[INFO] [stderr]    |
[INFO] [stderr] 16 |                      sample_spec: *mut pa_sample_spec,
[INFO] [stderr]    |                                   ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stderr]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/pulse.rs:38:1
[INFO] [stderr]    |
[INFO] [stderr] 38 | / struct pa_sample_spec {
[INFO] [stderr] 39 | |     format: c_int,
[INFO] [stderr] 40 | |     rate: u32,
[INFO] [stderr] 41 | |     channels: u8
[INFO] [stderr] 42 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `pulse::pa_simple` which is not FFI-safe: this struct has unspecified layout
[INFO] [stderr]   --> src/pulse.rs:19:44
[INFO] [stderr]    |
[INFO] [stderr] 19 |                      error: *mut c_int) -> *mut pa_simple;
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/pulse.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct pa_simple;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `pulse::pa_simple` which is not FFI-safe: this struct has unspecified layout
[INFO] [stderr]   --> src/pulse.rs:20:27
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn pa_simple_read(pa: *mut pa_simple,
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/pulse.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct pa_simple;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `extern` block uses type `pulse::pa_simple` which is not FFI-safe: this struct has unspecified layout
[INFO] [stderr]   --> src/pulse.rs:25:28
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn pa_simple_flush(pa: *mut pa_simple, error: *mut c_int) -> c_int;
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stderr] note: type defined here
[INFO] [stderr]   --> src/pulse.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct pa_simple;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:12:28
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub fn real_fft(x: &[f64], X: &mut [f64]) {
[INFO] [stderr]    |                            ^ help: convert the identifier to snake case: `x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `N` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let N = x.len();
[INFO] [stderr]    |         ^ help: convert the identifier to snake case: `n`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Nf` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let Nf = N as f64 - 1.0;
[INFO] [stderr]    |         ^^ help: convert the identifier to snake case: `nf`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `N` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let N = x.len();
[INFO] [stderr]    |         ^ help: convert the identifier to snake case: `n`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Nf` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |     let Nf = N as f64;
[INFO] [stderr]    |         ^^ help: convert the identifier to snake case: `nf`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |     let mut X: Vec<Complex<f64>> = vec![Complex::new(0.0, 0.0); N];
[INFO] [stderr]    |             ^ help: convert the identifier to snake case: `x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X_even` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |         let X_even = ditfft2(&evens[..]);
[INFO] [stderr]    |             ^^^^^^ help: convert the identifier to snake case: `x_even`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `X_odd` should have a snake case name
[INFO] [stderr]   --> src/fft.rs:74:13
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let X_odd = ditfft2(&odds[..]);
[INFO] [stderr]    |             ^^^^^ help: convert the identifier to snake case: `x_odd`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/vis.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |         self.canvas.set_scale(self.scale_x, self.scale_y);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/vis.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 | /         self.canvas.fill_rect(Rect::new(0, 0, self.win_width,
[INFO] [stderr] 66 | |                                                      self.win_height));
[INFO] [stderr]    | |_______________________________________________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/vis.rs:88:13
[INFO] [stderr]    |
[INFO] [stderr] 88 |             self.canvas.fill_rect(rect);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.03s
[INFO] running `"docker" "inspect" "9d617ced15013d4f6ebd670b3c1678f08997adcba9c79bca01412d631f69f90c"`
[INFO] running `"docker" "rm" "-f" "9d617ced15013d4f6ebd670b3c1678f08997adcba9c79bca01412d631f69f90c"`
[INFO] [stdout] 9d617ced15013d4f6ebd670b3c1678f08997adcba9c79bca01412d631f69f90c