[INFO] cloning repository https://github.com/schnommus/rust-fir
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/schnommus/rust-fir" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fschnommus%2Frust-fir", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fschnommus%2Frust-fir'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 82c71f2ec7814d186b5166e41999e0d2f228f2c5
[INFO] testing schnommus/rust-fir against 1.75.0 for beta-1.76-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fschnommus%2Frust-fir" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/schnommus/rust-fir on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/schnommus/rust-fir
[INFO] finished tweaking git repo https://github.com/schnommus/rust-fir
[INFO] tweaked toml for git repo https://github.com/schnommus/rust-fir written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/schnommus/rust-fir 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lazy_static v1.0.1
[INFO] [stderr]   Downloaded cc v1.0.17
[INFO] [stderr]   Downloaded color_quant v1.0.0
[INFO] [stderr]   Downloaded byteorder v0.5.3
[INFO] [stderr]   Downloaded rand_core v0.2.0
[INFO] [stderr]   Downloaded jpeg-decoder v0.1.14
[INFO] [stderr]   Downloaded flate2 v0.2.20
[INFO] [stderr]   Downloaded rayon v1.0.1
[INFO] [stderr]   Downloaded image v0.10.4
[INFO] [stderr]   Downloaded rand v0.5.0
[INFO] [stderr]   Downloaded gif v0.9.2
[INFO] [stderr]   Downloaded png v0.5.2
[INFO] [stderr]   Downloaded inflate v0.1.1
[INFO] [stderr]   Downloaded rayon-core v1.4.0
[INFO] [stderr]   Downloaded raster v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d83441261f3c6c55081b1325d1c43bc371e3f9956a4a2b6bbf1bce0e812723a
[INFO] running `Command { std: "docker" "start" "-a" "0d83441261f3c6c55081b1325d1c43bc371e3f9956a4a2b6bbf1bce0e812723a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d83441261f3c6c55081b1325d1c43bc371e3f9956a4a2b6bbf1bce0e812723a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d83441261f3c6c55081b1325d1c43bc371e3f9956a4a2b6bbf1bce0e812723a", kill_on_drop: false }`
[INFO] [stdout] 0d83441261f3c6c55081b1325d1c43bc371e3f9956a4a2b6bbf1bce0e812723a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3af6ab48f938f517d3bf902afdb93ff00b1194e847ecc6bb81dda1908631ccf8
[INFO] running `Command { std: "docker" "start" "-a" "3af6ab48f938f517d3bf902afdb93ff00b1194e847ecc6bb81dda1908631ccf8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.42
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling nodrop v0.1.12
[INFO] [stderr]    Compiling cfg-if v0.1.3
[INFO] [stderr]    Compiling lazy_static v1.0.1
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling memoffset v0.2.1
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling cc v1.0.17
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling byteorder v1.2.3
[INFO] [stderr]    Compiling byteorder v0.5.3
[INFO] [stderr]    Compiling bitflags v0.7.0
[INFO] [stderr]    Compiling glob v0.2.11
[INFO] [stderr]    Compiling arrayvec v0.4.7
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling inflate v0.1.1
[INFO] [stderr]    Compiling lzw v0.10.0
[INFO] [stderr]    Compiling color_quant v1.0.0
[INFO] [stderr]    Compiling rand_core v0.2.0
[INFO] [stderr]    Compiling gif v0.9.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling rand v0.5.0
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling flate2 v0.2.20
[INFO] [stderr]    Compiling rayon v1.0.1
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling png v0.5.2
[INFO] [stderr]    Compiling jpeg-decoder v0.1.14
[INFO] [stderr]    Compiling image v0.10.4
[INFO] [stderr]    Compiling raster v0.2.0
[INFO] [stderr]    Compiling fir v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `intensity_filtered`
[INFO] [stdout]    --> src/main.rs:197:13
[INFO] [stdout]     |
[INFO] [stdout] 197 |         let intensity_filtered =
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intensity_filtered`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Rectangular` and `BlackmanHarris` are never constructed
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum WindowType {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 15 |     Rectangular,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 16 |     Hamming,
[INFO] [stdout] 17 |     BlackmanHarris
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `HighPass`, `BandPass`, and `BandStop` are never constructed
[INFO] [stdout]   --> src/main.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | enum FilterType {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 44 |     LowPass(f64),
[INFO] [stdout] 45 |     HighPass(f64),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 46 |     BandPass(f64, f64),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 47 |     BandStop(f64, f64)
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dft` is never used
[INFO] [stdout]   --> src/main.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn dft(x: &[f64], n_samples: usize) -> Vec<f64> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `white_noise` is never used
[INFO] [stdout]    --> src/main.rs:120:4
[INFO] [stdout]     |
[INFO] [stdout] 120 | fn white_noise(n_samples: usize, amplitude: f64) -> Vec<f64> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `Fs` should have an upper case name
[INFO] [stdout]    --> src/main.rs:131:7
[INFO] [stdout]     |
[INFO] [stdout] 131 | const Fs: f64 = 20e6;
[INFO] [stdout]     |       ^^ help: convert the identifier to upper case (notice the capitalization): `FS`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `nyquist` should have an upper case name
[INFO] [stdout]    --> src/main.rs:132:7
[INFO] [stdout]     |
[INFO] [stdout] 132 | const nyquist: f64 = Fs/2.0;
[INFO] [stdout]     |       ^^^^^^^ help: convert the identifier to upper case: `NYQUIST`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `n_lines` should have an upper case name
[INFO] [stdout]    --> src/main.rs:133:7
[INFO] [stdout]     |
[INFO] [stdout] 133 | const n_lines: i32 = 625;
[INFO] [stdout]     |       ^^^^^^^ help: convert the identifier to upper case: `N_LINES`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `n_columns` should have an upper case name
[INFO] [stdout]    --> src/main.rs:134:7
[INFO] [stdout]     |
[INFO] [stdout] 134 | const n_columns: i32 = 700;
[INFO] [stdout]     |       ^^^^^^^^^ help: convert the identifier to upper case: `N_COLUMNS`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `line_freq_hz` should have an upper case name
[INFO] [stdout]    --> src/main.rs:135:7
[INFO] [stdout]     |
[INFO] [stdout] 135 | const line_freq_hz: f64 = 15.625e3;
[INFO] [stdout]     |       ^^^^^^^^^^^^ help: convert the identifier to upper case: `LINE_FREQ_HZ`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `frame_freq_hz` should have an upper case name
[INFO] [stdout]    --> src/main.rs:136:7
[INFO] [stdout]     |
[INFO] [stdout] 136 | const frame_freq_hz: f64 = 50.0;
[INFO] [stdout]     |       ^^^^^^^^^^^^^ help: convert the identifier to upper case: `FRAME_FREQ_HZ`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |         raster::save(&self.canvas, "test_render.png");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 223 |         let _ = raster::save(&self.canvas, "test_render.png");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.53s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "3af6ab48f938f517d3bf902afdb93ff00b1194e847ecc6bb81dda1908631ccf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3af6ab48f938f517d3bf902afdb93ff00b1194e847ecc6bb81dda1908631ccf8", kill_on_drop: false }`
[INFO] [stdout] 3af6ab48f938f517d3bf902afdb93ff00b1194e847ecc6bb81dda1908631ccf8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] be2e4663a0b109ba609b7ec94ef5641d42856adb891207246f2f04056734af67
[INFO] running `Command { std: "docker" "start" "-a" "be2e4663a0b109ba609b7ec94ef5641d42856adb891207246f2f04056734af67", kill_on_drop: false }`
[INFO] [stderr]    Compiling fir v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `intensity_filtered`
[INFO] [stdout]    --> src/main.rs:197:13
[INFO] [stdout]     |
[INFO] [stdout] 197 |         let intensity_filtered =
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intensity_filtered`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Rectangular` and `BlackmanHarris` are never constructed
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum WindowType {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 15 |     Rectangular,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 16 |     Hamming,
[INFO] [stdout] 17 |     BlackmanHarris
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `HighPass`, `BandPass`, and `BandStop` are never constructed
[INFO] [stdout]   --> src/main.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | enum FilterType {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 44 |     LowPass(f64),
[INFO] [stdout] 45 |     HighPass(f64),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 46 |     BandPass(f64, f64),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 47 |     BandStop(f64, f64)
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dft` is never used
[INFO] [stdout]   --> src/main.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn dft(x: &[f64], n_samples: usize) -> Vec<f64> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `white_noise` is never used
[INFO] [stdout]    --> src/main.rs:120:4
[INFO] [stdout]     |
[INFO] [stdout] 120 | fn white_noise(n_samples: usize, amplitude: f64) -> Vec<f64> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `Fs` should have an upper case name
[INFO] [stdout]    --> src/main.rs:131:7
[INFO] [stdout]     |
[INFO] [stdout] 131 | const Fs: f64 = 20e6;
[INFO] [stdout]     |       ^^ help: convert the identifier to upper case (notice the capitalization): `FS`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `nyquist` should have an upper case name
[INFO] [stdout]    --> src/main.rs:132:7
[INFO] [stdout]     |
[INFO] [stdout] 132 | const nyquist: f64 = Fs/2.0;
[INFO] [stdout]     |       ^^^^^^^ help: convert the identifier to upper case: `NYQUIST`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `n_lines` should have an upper case name
[INFO] [stdout]    --> src/main.rs:133:7
[INFO] [stdout]     |
[INFO] [stdout] 133 | const n_lines: i32 = 625;
[INFO] [stdout]     |       ^^^^^^^ help: convert the identifier to upper case: `N_LINES`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `n_columns` should have an upper case name
[INFO] [stdout]    --> src/main.rs:134:7
[INFO] [stdout]     |
[INFO] [stdout] 134 | const n_columns: i32 = 700;
[INFO] [stdout]     |       ^^^^^^^^^ help: convert the identifier to upper case: `N_COLUMNS`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `line_freq_hz` should have an upper case name
[INFO] [stdout]    --> src/main.rs:135:7
[INFO] [stdout]     |
[INFO] [stdout] 135 | const line_freq_hz: f64 = 15.625e3;
[INFO] [stdout]     |       ^^^^^^^^^^^^ help: convert the identifier to upper case: `LINE_FREQ_HZ`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `frame_freq_hz` should have an upper case name
[INFO] [stdout]    --> src/main.rs:136:7
[INFO] [stdout]     |
[INFO] [stdout] 136 | const frame_freq_hz: f64 = 50.0;
[INFO] [stdout]     |       ^^^^^^^^^^^^^ help: convert the identifier to upper case: `FRAME_FREQ_HZ`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |         raster::save(&self.canvas, "test_render.png");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 223 |         let _ = raster::save(&self.canvas, "test_render.png");
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.59s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "be2e4663a0b109ba609b7ec94ef5641d42856adb891207246f2f04056734af67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be2e4663a0b109ba609b7ec94ef5641d42856adb891207246f2f04056734af67", kill_on_drop: false }`
[INFO] [stdout] be2e4663a0b109ba609b7ec94ef5641d42856adb891207246f2f04056734af67
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 637bddf75c1a1322c5b662ea52f4835ec88a44f0ce3c13733ffdd66269916650
[INFO] running `Command { std: "docker" "start" "-a" "637bddf75c1a1322c5b662ea52f4835ec88a44f0ce3c13733ffdd66269916650", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `intensity_filtered`
[INFO] [stderr]    --> src/main.rs:197:13
[INFO] [stderr]     |
[INFO] [stderr] 197 |         let intensity_filtered =
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intensity_filtered`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Rectangular` and `BlackmanHarris` are never constructed
[INFO] [stderr]   --> src/main.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 14 | enum WindowType {
[INFO] [stderr]    |      ---------- variants in this enum
[INFO] [stderr] 15 |     Rectangular,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 16 |     Hamming,
[INFO] [stderr] 17 |     BlackmanHarris
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variants `HighPass`, `BandPass`, and `BandStop` are never constructed
[INFO] [stderr]   --> src/main.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 43 | enum FilterType {
[INFO] [stderr]    |      ---------- variants in this enum
[INFO] [stderr] 44 |     LowPass(f64),
[INFO] [stderr] 45 |     HighPass(f64),
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 46 |     BandPass(f64, f64),
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 47 |     BandStop(f64, f64)
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `dft` is never used
[INFO] [stderr]   --> src/main.rs:78:4
[INFO] [stderr]    |
[INFO] [stderr] 78 | fn dft(x: &[f64], n_samples: usize) -> Vec<f64> {
[INFO] [stderr]    |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `white_noise` is never used
[INFO] [stderr]    --> src/main.rs:120:4
[INFO] [stderr]     |
[INFO] [stderr] 120 | fn white_noise(n_samples: usize, amplitude: f64) -> Vec<f64> {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant `Fs` should have an upper case name
[INFO] [stderr]    --> src/main.rs:131:7
[INFO] [stderr]     |
[INFO] [stderr] 131 | const Fs: f64 = 20e6;
[INFO] [stderr]     |       ^^ help: convert the identifier to upper case (notice the capitalization): `FS`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant `nyquist` should have an upper case name
[INFO] [stderr]    --> src/main.rs:132:7
[INFO] [stderr]     |
[INFO] [stderr] 132 | const nyquist: f64 = Fs/2.0;
[INFO] [stderr]     |       ^^^^^^^ help: convert the identifier to upper case: `NYQUIST`
[INFO] [stderr] 
[INFO] [stderr] warning: constant `n_lines` should have an upper case name
[INFO] [stderr]    --> src/main.rs:133:7
[INFO] [stderr]     |
[INFO] [stderr] 133 | const n_lines: i32 = 625;
[INFO] [stderr]     |       ^^^^^^^ help: convert the identifier to upper case: `N_LINES`
[INFO] [stderr] 
[INFO] [stderr] warning: constant `n_columns` should have an upper case name
[INFO] [stderr]    --> src/main.rs:134:7
[INFO] [stderr]     |
[INFO] [stderr] 134 | const n_columns: i32 = 700;
[INFO] [stderr]     |       ^^^^^^^^^ help: convert the identifier to upper case: `N_COLUMNS`
[INFO] [stderr] 
[INFO] [stderr] warning: constant `line_freq_hz` should have an upper case name
[INFO] [stderr]    --> src/main.rs:135:7
[INFO] [stderr]     |
[INFO] [stderr] 135 | const line_freq_hz: f64 = 15.625e3;
[INFO] [stderr]     |       ^^^^^^^^^^^^ help: convert the identifier to upper case: `LINE_FREQ_HZ`
[INFO] [stderr] 
[INFO] [stderr] warning: constant `frame_freq_hz` should have an upper case name
[INFO] [stderr]    --> src/main.rs:136:7
[INFO] [stderr]     |
[INFO] [stderr] 136 | const frame_freq_hz: f64 = 50.0;
[INFO] [stderr]     |       ^^^^^^^^^^^^^ help: convert the identifier to upper case: `FRAME_FREQ_HZ`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:223:9
[INFO] [stderr]     |
[INFO] [stderr] 223 |         raster::save(&self.canvas, "test_render.png");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 223 |         let _ = raster::save(&self.canvas, "test_render.png");
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `fir` (bin "fir" test) generated 12 warnings (run `cargo fix --bin "fir" --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/fir-661ea70e108f5611)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "637bddf75c1a1322c5b662ea52f4835ec88a44f0ce3c13733ffdd66269916650", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "637bddf75c1a1322c5b662ea52f4835ec88a44f0ce3c13733ffdd66269916650", kill_on_drop: false }`
[INFO] [stdout] 637bddf75c1a1322c5b662ea52f4835ec88a44f0ce3c13733ffdd66269916650
