[INFO] cloning repository https://github.com/Niedzwiedzw/learning-audio-programming
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Niedzwiedzw/learning-audio-programming" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNiedzwiedzw%2Flearning-audio-programming", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNiedzwiedzw%2Flearning-audio-programming'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ac3fb55d7c0c12a9dcecaa8bece165e6397f23c6
[INFO] testing Niedzwiedzw/learning-audio-programming against 1.54.0 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNiedzwiedzw%2Flearning-audio-programming" "/workspace/builds/worker-91/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-91/source'...
[INFO] [stderr] done.
[INFO] [stderr] Updating files:  70% (7/10)
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Updating files: 100% (10/10), done.
[INFO] validating manifest of git repo https://github.com/Niedzwiedzw/learning-audio-programming on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Niedzwiedzw/learning-audio-programming
[INFO] finished tweaking git repo https://github.com/Niedzwiedzw/learning-audio-programming
[INFO] tweaked toml for git repo https://github.com/Niedzwiedzw/learning-audio-programming written to /workspace/builds/worker-91/source/Cargo.toml
[INFO] crate git repo https://github.com/Niedzwiedzw/learning-audio-programming already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a5e3fb1222d8c6fcce1c9f6a2103a92df0e8eb23d04b0e1693b8341772fc68ef
[INFO] running `Command { std: "docker" "start" "-a" "a5e3fb1222d8c6fcce1c9f6a2103a92df0e8eb23d04b0e1693b8341772fc68ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a5e3fb1222d8c6fcce1c9f6a2103a92df0e8eb23d04b0e1693b8341772fc68ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a5e3fb1222d8c6fcce1c9f6a2103a92df0e8eb23d04b0e1693b8341772fc68ef", kill_on_drop: false }`
[INFO] [stdout] a5e3fb1222d8c6fcce1c9f6a2103a92df0e8eb23d04b0e1693b8341772fc68ef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1c2148d59cbcaddcdcb298324c691c1af1b83572786958ce225318a9cdc10363
[INFO] running `Command { std: "docker" "start" "-a" "1c2148d59cbcaddcdcb298324c691c1af1b83572786958ce225318a9cdc10363", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.95
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling plotters-backend v0.3.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.22
[INFO] [stderr]    Compiling weezl v0.1.5
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling strength_reduce v0.2.3
[INFO] [stderr]    Compiling float-ord v0.2.0
[INFO] [stderr]    Compiling ttf-parser v0.12.1
[INFO] [stderr]    Compiling hound v3.4.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]    Compiling servo-fontconfig-sys v5.1.0
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling deflate v0.8.6
[INFO] [stderr]    Compiling miniz_oxide v0.3.7
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling ringbuf v0.2.5
[INFO] [stderr]    Compiling plotters-svg v0.3.0
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling gif v0.11.2
[INFO] [stderr]    Compiling itertools v0.10.0
[INFO] [stderr]    Compiling png v0.16.8
[INFO] [stderr]    Compiling freetype-sys v0.13.1
[INFO] [stderr]    Compiling expat-sys v2.1.6
[INFO] [stderr]    Compiling semver-parser v0.10.2
[INFO] [stderr]    Compiling crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling dirs-sys v0.3.6
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling semver v0.11.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling dirs v2.0.2
[INFO] [stderr]    Compiling rand_core v0.6.2
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling freetype v0.7.0
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling rand_xorshift v0.3.0
[INFO] [stderr]    Compiling rustc_version v0.3.3
[INFO] [stderr]    Compiling servo-fontconfig v0.5.1
[INFO] [stderr]    Compiling num-complex v0.4.0
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling pathfinder_simd v0.5.1
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling primal-check v0.3.1
[INFO] [stderr]    Compiling transpose v0.2.1
[INFO] [stderr]    Compiling rustfft v6.0.1
[INFO] [stderr]    Compiling rand_distr v0.4.0
[INFO] [stderr]    Compiling image v0.23.14
[INFO] [stderr]    Compiling pathfinder_geometry v0.5.1
[INFO] [stderr]    Compiling font-kit v0.10.0
[INFO] [stderr]    Compiling plotters-bitmap v0.3.1
[INFO] [stderr]    Compiling plotters v0.3.1
[INFO] [stderr]    Compiling learning-audio-programming v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(min_type_alias_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `itertools::Itertools`
[INFO] [stdout]  --> src/pythagorean_chords.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use itertools::Itertools;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `WavReader`, `WavWriter`
[INFO] [stdout]  --> src/lo_pass_filter.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | use hound::{WavReader, WavWriter};
[INFO] [stdout]   |             ^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Consumer`, `Producer`, `RingBuffer`
[INFO] [stdout]  --> src/lo_pass_filter.rs:3:15
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ringbuf::{Consumer, Producer, RingBuffer};
[INFO] [stdout]   |               ^^^^^^^^  ^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AMPLITUDE`, `SAMPLE_RATE`, `sine_wave`
[INFO] [stdout]  --> src/plot_frequency.rs:3:33
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::pythagorean_chords::{sine_wave, AMPLITUDE, SAMPLE_RATE};
[INFO] [stdout]   |                                 ^^^^^^^^^  ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::SeedableRng`
[INFO] [stdout]  --> src/plot_frequency.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use rand::SeedableRng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Distribution`, `Normal`
[INFO] [stdout]  --> src/plot_frequency.rs:7:18
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rand_distr::{Distribution, Normal};
[INFO] [stdout]   |                  ^^^^^^^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand_xorshift::XorShiftRng`
[INFO] [stdout]  --> src/plot_frequency.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use rand_xorshift::XorShiftRng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]   --> src/plot_frequency.rs:10:19
[INFO] [stdout]    |
[INFO] [stdout] 10 |     num_complex::{self, Complex},
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `learning-audio-programming`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "1c2148d59cbcaddcdcb298324c691c1af1b83572786958ce225318a9cdc10363", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c2148d59cbcaddcdcb298324c691c1af1b83572786958ce225318a9cdc10363", kill_on_drop: false }`
[INFO] [stdout] 1c2148d59cbcaddcdcb298324c691c1af1b83572786958ce225318a9cdc10363
