[INFO] cloning repository https://github.com/DasEtwas/arduino_audio_stream
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DasEtwas/arduino_audio_stream" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDasEtwas%2Farduino_audio_stream", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDasEtwas%2Farduino_audio_stream'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4d0f4bf98bbf9c9ad56c02fd2ea904fd07e3fb39
[INFO] checking DasEtwas/arduino_audio_stream against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDasEtwas%2Farduino_audio_stream" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DasEtwas/arduino_audio_stream on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/DasEtwas/arduino_audio_stream
[INFO] finished tweaking git repo https://github.com/DasEtwas/arduino_audio_stream
[INFO] tweaked toml for git repo https://github.com/DasEtwas/arduino_audio_stream written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/DasEtwas/arduino_audio_stream 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serialport v4.0.0
[INFO] [stderr]   Downloaded nix v0.16.1
[INFO] [stderr]   Downloaded libc v0.2.85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 190fae57cdeef35da0bab24d587e060a561460de067ee9602ba9004a1a45af6e
[INFO] running `Command { std: "docker" "start" "-a" "190fae57cdeef35da0bab24d587e060a561460de067ee9602ba9004a1a45af6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "190fae57cdeef35da0bab24d587e060a561460de067ee9602ba9004a1a45af6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "190fae57cdeef35da0bab24d587e060a561460de067ee9602ba9004a1a45af6e", kill_on_drop: false }`
[INFO] [stdout] 190fae57cdeef35da0bab24d587e060a561460de067ee9602ba9004a1a45af6e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6bd24224e4a82c3fbf7c2b7425816e028235bba6ba746d4d2c1af849ce7291db
[INFO] running `Command { std: "docker" "start" "-a" "6bd24224e4a82c3fbf7c2b7425816e028235bba6ba746d4d2c1af849ce7291db", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.85
[INFO] [stderr]    Compiling nix v0.16.1
[INFO] [stderr]     Checking hound v3.4.0
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking libudev v0.2.0
[INFO] [stderr]     Checking serialport v4.0.0
[INFO] [stderr]     Checking arduino_audio_stream v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `yield_now`
[INFO] [stdout]  --> src/main.rs:9:33
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::thread::{sleep, spawn, yield_now};
[INFO] [stdout]   |                                 ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `yield_now`
[INFO] [stdout]  --> src/main.rs:9:33
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::thread::{sleep, spawn, yield_now};
[INFO] [stdout]   |                                 ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `LPF_STRENGTH` is never used
[INFO] [stdout]   --> src/dfpwm.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | const LPF_STRENGTH: i32 = 140;
[INFO] [stdout]    |       ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DfpwmDecoder` is never constructed
[INFO] [stdout]   --> src/dfpwm.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub struct DfpwmDecoder {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `decompress_byte` are never used
[INFO] [stdout]   --> src/dfpwm.rs:71:12
[INFO] [stdout]    |
[INFO] [stdout] 70 | impl DfpwmDecoder {
[INFO] [stdout]    | ----------------- associated items in this implementation
[INFO] [stdout] 71 |     pub fn new() -> DfpwmDecoder {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 84 |     pub fn decompress_byte(&mut self, data: u8, output: &mut [i32; 8]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `decompress_byte` is never used
[INFO] [stdout]   --> src/dfpwm.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn decompress_byte(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `LPF_STRENGTH` is never used
[INFO] [stdout]   --> src/dfpwm.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | const LPF_STRENGTH: i32 = 140;
[INFO] [stdout]    |       ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DfpwmDecoder` is never constructed
[INFO] [stdout]   --> src/dfpwm.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub struct DfpwmDecoder {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `decompress_byte` are never used
[INFO] [stdout]   --> src/dfpwm.rs:71:12
[INFO] [stdout]    |
[INFO] [stdout] 70 | impl DfpwmDecoder {
[INFO] [stdout]    | ----------------- associated items in this implementation
[INFO] [stdout] 71 |     pub fn new() -> DfpwmDecoder {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 84 |     pub fn decompress_byte(&mut self, data: u8, output: &mut [i32; 8]) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `decompress_byte` is never used
[INFO] [stdout]   --> src/dfpwm.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn decompress_byte(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.51s
[INFO] running `Command { std: "docker" "inspect" "6bd24224e4a82c3fbf7c2b7425816e028235bba6ba746d4d2c1af849ce7291db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6bd24224e4a82c3fbf7c2b7425816e028235bba6ba746d4d2c1af849ce7291db", kill_on_drop: false }`
[INFO] [stdout] 6bd24224e4a82c3fbf7c2b7425816e028235bba6ba746d4d2c1af849ce7291db