[INFO] cloning repository https://github.com/gespel/StensLab
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gespel/StensLab" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgespel%2FStensLab", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgespel%2FStensLab'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fef561d7a085cba16b07a824f97352da1f8c150e
[INFO] checking gespel/StensLab against master#3350c1eb3fd8fe1bee1ed4c76944d707bd256876 for pr-140558
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgespel%2FStensLab" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gespel/StensLab on toolchain 3350c1eb3fd8fe1bee1ed4c76944d707bd256876
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3350c1eb3fd8fe1bee1ed4c76944d707bd256876" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gespel/StensLab
[INFO] finished tweaking git repo https://github.com/gespel/StensLab
[INFO] tweaked toml for git repo https://github.com/gespel/StensLab written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/gespel/StensLab already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3350c1eb3fd8fe1bee1ed4c76944d707bd256876" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+3350c1eb3fd8fe1bee1ed4c76944d707bd256876" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ec52a67ce20b2f77f71da203713b9daba8068c268d7a9122b598406dbc0cf551
[INFO] running `Command { std: "docker" "start" "-a" "ec52a67ce20b2f77f71da203713b9daba8068c268d7a9122b598406dbc0cf551", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ec52a67ce20b2f77f71da203713b9daba8068c268d7a9122b598406dbc0cf551", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec52a67ce20b2f77f71da203713b9daba8068c268d7a9122b598406dbc0cf551", kill_on_drop: false }`
[INFO] [stdout] ec52a67ce20b2f77f71da203713b9daba8068c268d7a9122b598406dbc0cf551
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+3350c1eb3fd8fe1bee1ed4c76944d707bd256876" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52e4336b0e777952538b2c035fe77d4d12bf9f6cb594f90984a93f0c8f9705b5
[INFO] running `Command { std: "docker" "start" "-a" "52e4336b0e777952538b2c035fe77d4d12bf9f6cb594f90984a93f0c8f9705b5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.75
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling pkg-config v0.3.28
[INFO] [stderr]    Compiling parking_lot_core v0.9.9
[INFO] [stderr]     Checking smallvec v1.11.2
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling serde v1.0.195
[INFO] [stderr]    Compiling cpal v0.15.2
[INFO] [stderr]    Compiling serde_json v1.0.111
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking dasp_sample v0.11.0
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]     Checking itoa v1.0.10
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling num-traits v0.2.17
[INFO] [stderr]    Compiling alsa-sys v0.3.1
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking num-complex v0.4.4
[INFO] [stderr]     Checking getrandom v0.2.11
[INFO] [stderr]     Checking nix v0.24.3
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking alsa v0.7.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling serde_derive v1.0.195
[INFO] [stderr]     Checking StensLab v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `cpal::SampleRate`
[INFO] [stdout]  --> src/synths.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use cpal::SampleRate;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `GPulsePad`
[INFO] [stdout]   --> src/main.rs:12:26
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::instruments::{GPulsePad, MegaDrone};
[INFO] [stdout]    |                          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SawtoothSynth`
[INFO] [stdout]   --> src/main.rs:14:33
[INFO] [stdout]    |
[INFO] [stdout] 14 | use crate::synths::{PulseSynth, SawtoothSynth, Synth};
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Synth`
[INFO] [stdout]   --> src/main.rs:14:48
[INFO] [stdout]    |
[INFO] [stdout] 14 | use crate::synths::{PulseSynth, SawtoothSynth, Synth};
[INFO] [stdout]    |                                                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cpal::SampleRate`
[INFO] [stdout]  --> src/synths.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use cpal::SampleRate;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `GPulsePad`
[INFO] [stdout]   --> src/main.rs:12:26
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::instruments::{GPulsePad, MegaDrone};
[INFO] [stdout]    |                          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SawtoothSynth`
[INFO] [stdout]   --> src/main.rs:14:33
[INFO] [stdout]    |
[INFO] [stdout] 14 | use crate::synths::{PulseSynth, SawtoothSynth, Synth};
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/instruments.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let mut s = self.p1.get_sample() + self.p2.get_sample() + self.p3.get_sample();
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/instruments.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |         for i in 0..count {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/instruments.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |         let mut pulse: Vec<PulseSynth> = Vec::new();
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/instruments.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         for mut sv in &mut self.saw_voices {
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `samples_per_phase` is never read
[INFO] [stdout]   --> src/synths.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct SineSynth {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 12 |     samples_per_phase: usize
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/synths.rs:16:19
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl SineSynth {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 16 |     pub(crate) fn new(sample_rate: usize) -> SineSynth {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/synths.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl SquareSynth {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 45 |     fn new(sample_rate: usize) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `pulse_pos`, `pulse_size`, and `sample_rate` are never read
[INFO] [stdout]    --> src/synths.rs:106:5
[INFO] [stdout]     |
[INFO] [stdout] 104 | pub struct PulseSynth {
[INFO] [stdout]     |            ---------- fields in this struct
[INFO] [stdout] 105 |     phase: usize,
[INFO] [stdout] 106 |     pulse_pos: f32,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 107 |     pulse_size: f32,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 108 |     freq: f32,
[INFO] [stdout] 109 |     sample_rate: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `set_pulse_size` is never used
[INFO] [stdout]    --> src/synths.rs:152:12
[INFO] [stdout]     |
[INFO] [stdout] 135 | impl PulseSynth {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 152 |     pub fn set_pulse_size(&mut self, size: f32) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rack` is never constructed
[INFO] [stdout]  --> src/rack.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Rack {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `add_synth` are never used
[INFO] [stdout]   --> src/rack.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Rack {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 8  |     fn new() -> Rack {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub fn add_synth<T: Synth + 'static>(&mut self, synth: T) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GPulsePad` is never constructed
[INFO] [stdout]  --> src/instruments.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct GPulsePad {
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get_sample`, and `set_frequency` are never used
[INFO] [stdout]   --> src/instruments.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl GPulsePad {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 11 |     pub fn new(sample_rate: usize) -> GPulsePad {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn get_sample(&mut self) -> f32 {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn set_frequency(&mut self, freq: f32) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `pulse_voices` and `freq` are never read
[INFO] [stdout]   --> src/instruments.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct MegaDrone {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 33 |     saw_voices: Vec<SawtoothSynth>,
[INFO] [stdout] 34 |     pulse_voices: Vec<PulseSynth>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 35 |     count: usize,
[INFO] [stdout] 36 |     freq: f32
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Synth`
[INFO] [stdout]   --> src/main.rs:14:48
[INFO] [stdout]    |
[INFO] [stdout] 14 | use crate::synths::{PulseSynth, SawtoothSynth, Synth};
[INFO] [stdout]    |                                                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/instruments.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let mut s = self.p1.get_sample() + self.p2.get_sample() + self.p3.get_sample();
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/instruments.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |         for i in 0..count {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/instruments.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |         let mut pulse: Vec<PulseSynth> = Vec::new();
[INFO] [stdout]    |             ----^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/instruments.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         for mut sv in &mut self.saw_voices {
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `samples_per_phase` is never read
[INFO] [stdout]   --> src/synths.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | pub struct SineSynth {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 12 |     samples_per_phase: usize
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/synths.rs:16:19
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl SineSynth {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 16 |     pub(crate) fn new(sample_rate: usize) -> SineSynth {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/synths.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl SquareSynth {
[INFO] [stdout]    | ---------------- associated function in this implementation
[INFO] [stdout] 45 |     fn new(sample_rate: usize) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `pulse_pos`, `pulse_size`, and `sample_rate` are never read
[INFO] [stdout]    --> src/synths.rs:106:5
[INFO] [stdout]     |
[INFO] [stdout] 104 | pub struct PulseSynth {
[INFO] [stdout]     |            ---------- fields in this struct
[INFO] [stdout] 105 |     phase: usize,
[INFO] [stdout] 106 |     pulse_pos: f32,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 107 |     pulse_size: f32,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 108 |     freq: f32,
[INFO] [stdout] 109 |     sample_rate: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `set_pulse_size` is never used
[INFO] [stdout]    --> src/synths.rs:152:12
[INFO] [stdout]     |
[INFO] [stdout] 135 | impl PulseSynth {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 152 |     pub fn set_pulse_size(&mut self, size: f32) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rack` is never constructed
[INFO] [stdout]  --> src/rack.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Rack {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `add_synth` are never used
[INFO] [stdout]   --> src/rack.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl Rack {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 8  |     fn new() -> Rack {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     pub fn add_synth<T: Synth + 'static>(&mut self, synth: T) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GPulsePad` is never constructed
[INFO] [stdout]  --> src/instruments.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct GPulsePad {
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get_sample`, and `set_frequency` are never used
[INFO] [stdout]   --> src/instruments.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl GPulsePad {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 11 |     pub fn new(sample_rate: usize) -> GPulsePad {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn get_sample(&mut self) -> f32 {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn set_frequency(&mut self, freq: f32) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `pulse_voices` and `freq` are never read
[INFO] [stdout]   --> src/instruments.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct MegaDrone {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 33 |     saw_voices: Vec<SawtoothSynth>,
[INFO] [stdout] 34 |     pulse_voices: Vec<PulseSynth>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 35 |     count: usize,
[INFO] [stdout] 36 |     freq: f32
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.62s
[INFO] running `Command { std: "docker" "inspect" "52e4336b0e777952538b2c035fe77d4d12bf9f6cb594f90984a93f0c8f9705b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52e4336b0e777952538b2c035fe77d4d12bf9f6cb594f90984a93f0c8f9705b5", kill_on_drop: false }`
[INFO] [stdout] 52e4336b0e777952538b2c035fe77d4d12bf9f6cb594f90984a93f0c8f9705b5
