[INFO] cloning repository https://github.com/davidbrowning/oscilloscope
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/davidbrowning/oscilloscope" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavidbrowning%2Foscilloscope", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavidbrowning%2Foscilloscope'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dd79284a9b7a93e6074ca1afb68d00d82dfdfc61
[INFO] checking davidbrowning/oscilloscope against master#fe348cd1a8e0fa445b772393147ed865904dcd4d for pr-139587-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavidbrowning%2Foscilloscope" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/davidbrowning/oscilloscope on toolchain fe348cd1a8e0fa445b772393147ed865904dcd4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fe348cd1a8e0fa445b772393147ed865904dcd4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/davidbrowning/oscilloscope
[INFO] finished tweaking git repo https://github.com/davidbrowning/oscilloscope
[INFO] tweaked toml for git repo https://github.com/davidbrowning/oscilloscope written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/davidbrowning/oscilloscope 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" "+fe348cd1a8e0fa445b772393147ed865904dcd4d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+fe348cd1a8e0fa445b772393147ed865904dcd4d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4bf11bdbdb3fef05025c95e8a8db7978ea0b16190bebed002011b4d9366342e4
[INFO] running `Command { std: "docker" "start" "-a" "4bf11bdbdb3fef05025c95e8a8db7978ea0b16190bebed002011b4d9366342e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4bf11bdbdb3fef05025c95e8a8db7978ea0b16190bebed002011b4d9366342e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bf11bdbdb3fef05025c95e8a8db7978ea0b16190bebed002011b4d9366342e4", kill_on_drop: false }`
[INFO] [stdout] 4bf11bdbdb3fef05025c95e8a8db7978ea0b16190bebed002011b4d9366342e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+fe348cd1a8e0fa445b772393147ed865904dcd4d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "cf846639cd0c113b55aa3b40340e18c8f3508e646807174ddb3804ba56f40e10", kill_on_drop: false }`
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[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let mut sys_stream = build_audio_stream(AudioSource::SystemOutput, sys_tx.clone())?;
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let mut sys_stream = build_audio_stream(AudioSource::SystemOutput, sys_tx.clone())?;
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let mut mic_stream = build_audio_stream(AudioSource::Microphone, mic_tx.clone())?;
[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/main.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let mut mic_stream = build_audio_stream(AudioSource::Microphone, mic_tx.clone())?;
[INFO] [stdout]    |         ----^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `source` is never read
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct AudioStream {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] 13 |     stream: cpal::Stream,
[INFO] [stdout] 14 |     source: AudioSource,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `sys_stream`, `mic_stream`, `sys_tx`, and `mic_tx` are never read
[INFO] [stdout]    --> src/main.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 95  | struct MyApp {
[INFO] [stdout]     |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 100 |     sys_stream: AudioStream,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 101 |     mic_stream: AudioStream,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 102 |     sys_tx: Sender<f32>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 103 |     mic_tx: Sender<f32>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `source` is never read
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct AudioStream {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] 13 |     stream: cpal::Stream,
[INFO] [stdout] 14 |     source: AudioSource,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `sys_stream`, `mic_stream`, `sys_tx`, and `mic_tx` are never read
[INFO] [stdout]    --> src/main.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 95  | struct MyApp {
[INFO] [stdout]     |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 100 |     sys_stream: AudioStream,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 101 |     mic_stream: AudioStream,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 102 |     sys_tx: Sender<f32>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 103 |     mic_tx: Sender<f32>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 18.40s
[INFO] running `Command { std: "docker" "inspect" "cf846639cd0c113b55aa3b40340e18c8f3508e646807174ddb3804ba56f40e10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf846639cd0c113b55aa3b40340e18c8f3508e646807174ddb3804ba56f40e10", kill_on_drop: false }`
[INFO] [stdout] cf846639cd0c113b55aa3b40340e18c8f3508e646807174ddb3804ba56f40e10