[INFO] cloning repository https://github.com/jtbeckha/Sparkles
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jtbeckha/Sparkles" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjtbeckha%2FSparkles", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjtbeckha%2FSparkles'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4f1ec07b2813e88e6e43ae774eaa0ae21f480db9
[INFO] testing jtbeckha/Sparkles against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjtbeckha%2FSparkles" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jtbeckha/Sparkles on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jtbeckha/Sparkles
[INFO] finished tweaking git repo https://github.com/jtbeckha/Sparkles
[INFO] tweaked toml for git repo https://github.com/jtbeckha/Sparkles written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/jtbeckha/Sparkles already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded chrono v0.4.6
[INFO] [stderr]   Downloaded pkg-config v0.3.14
[INFO] [stderr]   Downloaded termion v1.5.2
[INFO] [stderr]   Downloaded libpulse-simple-sys v1.5.0
[INFO] [stderr]   Downloaded failure_derive v0.1.5
[INFO] [stderr]   Downloaded syn v0.15.34
[INFO] [stderr]   Downloaded byteorder v1.3.1
[INFO] [stderr]   Downloaded constant_time_eq v0.1.3
[INFO] [stderr]   Downloaded libpulse-binding v2.6.0
[INFO] [stderr]   Downloaded libpulse-sys v1.5.0
[INFO] [stderr]   Downloaded argon2rs v0.2.5
[INFO] [stderr]   Downloaded backtrace-sys v0.1.28
[INFO] [stderr]   Downloaded blake2-rfc v0.2.18
[INFO] [stderr]   Downloaded cc v1.0.37
[INFO] [stderr]   Downloaded backtrace v0.3.26
[INFO] [stderr]   Downloaded rustc-demangle v0.1.14
[INFO] [stderr]   Downloaded term v0.5.2
[INFO] [stderr]   Downloaded synstructure v0.10.2
[INFO] [stderr]   Downloaded failure v0.1.5
[INFO] [stderr]   Downloaded bitflags v1.0.4
[INFO] [stderr]   Downloaded redox_users v0.3.0
[INFO] [stderr]   Downloaded libc v0.2.55
[INFO] [stderr]   Downloaded simplelog v0.5.3
[INFO] [stderr]   Downloaded libpulse-simple-binding v2.6.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b129b606cfb9961a48ca3e33c574e5ad340c22335cf6f8ab7f2ffc534813c1df
[INFO] running `Command { std: "docker" "start" "-a" "b129b606cfb9961a48ca3e33c574e5ad340c22335cf6f8ab7f2ffc534813c1df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b129b606cfb9961a48ca3e33c574e5ad340c22335cf6f8ab7f2ffc534813c1df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b129b606cfb9961a48ca3e33c574e5ad340c22335cf6f8ab7f2ffc534813c1df", kill_on_drop: false }`
[INFO] [stdout] b129b606cfb9961a48ca3e33c574e5ad340c22335cf6f8ab7f2ffc534813c1df
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 88c62cbfce685f840c19ae8115603b10b6c1342f3f8e44fe67c69cc9e4fc07fa
[INFO] running `Command { std: "docker" "start" "-a" "88c62cbfce685f840c19ae8115603b10b6c1342f3f8e44fe67c69cc9e4fc07fa", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.55
[INFO] [stderr]    Compiling numtoa v0.1.0
[INFO] [stderr]    Compiling libpulse-sys v1.5.0
[INFO] [stderr]    Compiling libpulse-simple-sys v1.5.0
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling termion v1.5.2
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling libpulse-binding v2.6.0
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling simplelog v0.5.3
[INFO] [stderr]    Compiling libpulse-simple-binding v2.6.1
[INFO] [stderr]    Compiling sparkles v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[macro_use] extern crate log;
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ByteOrder`, `NativeEndian`
[INFO] [stdout]  --> src/main.rs:9:17
[INFO] [stdout]   |
[INFO] [stdout] 9 | use byteorder::{ByteOrder, NativeEndian};
[INFO] [stdout]   |                 ^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::analyze::rms_amplitude`
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use crate::analyze::rms_amplitude;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `decode`
[INFO] [stdout]   --> src/main.rs:17:21
[INFO] [stdout]    |
[INFO] [stdout] 17 | use crate::decode::{decode, decode_stereo};
[INFO] [stdout]    |                     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/audio_stream/pulse_simple.rs:15:23
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn build() -> Box<Stream> {
[INFO] [stdout]    |                       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 15 - pub fn build() -> Box<Stream> {
[INFO] [stdout] 15 + pub fn build() -> Box<dyn Stream> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/audio_stream/mod.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     panic!("Invalid audio stream_type");
[INFO] [stdout]    |     ----------------------------------- any code following this expression is unreachable
[INFO] [stdout] 22 |     return Option::None;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rms_amplitude`
[INFO] [stdout]  --> src/analyze/mod.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn rms_amplitude(samples: &mut Vec<f32>) -> f32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `decode`
[INFO] [stdout]   --> src/decode.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn decode(input: &[u8]) -> Vec<f32> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `draw`
[INFO] [stdout]   --> src/tty.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn draw(&mut self, meter: Meter) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.13s
[INFO] running `Command { std: "docker" "inspect" "88c62cbfce685f840c19ae8115603b10b6c1342f3f8e44fe67c69cc9e4fc07fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88c62cbfce685f840c19ae8115603b10b6c1342f3f8e44fe67c69cc9e4fc07fa", kill_on_drop: false }`
[INFO] [stdout] 88c62cbfce685f840c19ae8115603b10b6c1342f3f8e44fe67c69cc9e4fc07fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6dda1b527f8bc63aec9fd9a7f8b23e1a0e93ff13660bfb5d241b6d03e54245b9
[INFO] running `Command { std: "docker" "start" "-a" "6dda1b527f8bc63aec9fd9a7f8b23e1a0e93ff13660bfb5d241b6d03e54245b9", kill_on_drop: false }`
[INFO] [stderr]    Compiling sparkles v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[macro_use] extern crate log;
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ByteOrder`, `NativeEndian`
[INFO] [stdout]  --> src/main.rs:9:17
[INFO] [stdout]   |
[INFO] [stdout] 9 | use byteorder::{ByteOrder, NativeEndian};
[INFO] [stdout]   |                 ^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::analyze::rms_amplitude`
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use crate::analyze::rms_amplitude;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `decode`
[INFO] [stdout]   --> src/main.rs:17:21
[INFO] [stdout]    |
[INFO] [stdout] 17 | use crate::decode::{decode, decode_stereo};
[INFO] [stdout]    |                     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/audio_stream/pulse_simple.rs:15:23
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn build() -> Box<Stream> {
[INFO] [stdout]    |                       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 15 - pub fn build() -> Box<Stream> {
[INFO] [stdout] 15 + pub fn build() -> Box<dyn Stream> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/audio_stream/mod.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     panic!("Invalid audio stream_type");
[INFO] [stdout]    |     ----------------------------------- any code following this expression is unreachable
[INFO] [stdout] 22 |     return Option::None;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rms_amplitude`
[INFO] [stdout]  --> src/analyze/mod.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn rms_amplitude(samples: &mut Vec<f32>) -> f32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `decode`
[INFO] [stdout]   --> src/decode.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn decode(input: &[u8]) -> Vec<f32> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `draw`
[INFO] [stdout]   --> src/tty.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn draw(&mut self, meter: Meter) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `Command { std: "docker" "inspect" "6dda1b527f8bc63aec9fd9a7f8b23e1a0e93ff13660bfb5d241b6d03e54245b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dda1b527f8bc63aec9fd9a7f8b23e1a0e93ff13660bfb5d241b6d03e54245b9", kill_on_drop: false }`
[INFO] [stdout] 6dda1b527f8bc63aec9fd9a7f8b23e1a0e93ff13660bfb5d241b6d03e54245b9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f9eb5a9343982171f9fd2277dac9a9056fd9548bc19aaaaa17a6410db99ddb3b
[INFO] running `Command { std: "docker" "start" "-a" "f9eb5a9343982171f9fd2277dac9a9056fd9548bc19aaaaa17a6410db99ddb3b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | #[macro_use] extern crate log;
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ByteOrder`, `NativeEndian`
[INFO] [stderr]  --> src/main.rs:9:17
[INFO] [stderr]   |
[INFO] [stderr] 9 | use byteorder::{ByteOrder, NativeEndian};
[INFO] [stderr]   |                 ^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::analyze::rms_amplitude`
[INFO] [stderr]   --> src/main.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | use crate::analyze::rms_amplitude;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `decode`
[INFO] [stderr]   --> src/main.rs:17:21
[INFO] [stderr]    |
[INFO] [stderr] 17 | use crate::decode::{decode, decode_stereo};
[INFO] [stderr]    |                     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/audio_stream/pulse_simple.rs:15:23
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn build() -> Box<Stream> {
[INFO] [stderr]    |                       ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 15 - pub fn build() -> Box<Stream> {
[INFO] [stderr] 15 + pub fn build() -> Box<dyn Stream> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/audio_stream/mod.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     panic!("Invalid audio stream_type");
[INFO] [stderr]    |     ----------------------------------- any code following this expression is unreachable
[INFO] [stderr] 22 |     return Option::None;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `rms_amplitude`
[INFO] [stderr]  --> src/analyze/mod.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn rms_amplitude(samples: &mut Vec<f32>) -> f32 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `decode`
[INFO] [stderr]   --> src/decode.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub fn decode(input: &[u8]) -> Vec<f32> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `draw`
[INFO] [stderr]   --> src/tty.rs:36:12
[INFO] [stderr]    |
[INFO] [stderr] 36 |     pub fn draw(&mut self, meter: Meter) {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `sparkles` (bin "sparkles" test) generated 9 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/sparkles-1b3cbf0893c5c8c2)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test decode::tests::test_decode_stereo ... ok
[INFO] [stdout] test analyze::tests::test_rms_amplitude_stereo ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f9eb5a9343982171f9fd2277dac9a9056fd9548bc19aaaaa17a6410db99ddb3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9eb5a9343982171f9fd2277dac9a9056fd9548bc19aaaaa17a6410db99ddb3b", kill_on_drop: false }`
[INFO] [stdout] f9eb5a9343982171f9fd2277dac9a9056fd9548bc19aaaaa17a6410db99ddb3b