[INFO] cloning repository https://github.com/timjrd/wasm-spectrogram
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/timjrd/wasm-spectrogram" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimjrd%2Fwasm-spectrogram", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimjrd%2Fwasm-spectrogram'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 846eccbb049b55d725f2435611c5c9facfccf238
[INFO] checking timjrd/wasm-spectrogram against try#4a23c45c7893f1416456144e3883cc48ea91722e for pr-82322
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimjrd%2Fwasm-spectrogram" "/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/timjrd/wasm-spectrogram on toolchain 4a23c45c7893f1416456144e3883cc48ea91722e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/timjrd/wasm-spectrogram
[INFO] finished tweaking git repo https://github.com/timjrd/wasm-spectrogram
[INFO] tweaked toml for git repo https://github.com/timjrd/wasm-spectrogram written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/timjrd/wasm-spectrogram already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.54
[INFO] [stderr]   Downloaded transpose v0.1.0
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.54
[INFO] [stderr]   Downloaded rustfft v3.0.0
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.54
[INFO] [stderr]   Downloaded wasm-bindgen-webidl v0.2.54
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.54
[INFO] [stderr]   Downloaded js-sys v0.3.31
[INFO] [stderr]   Downloaded syn v1.0.8
[INFO] [stderr]   Downloaded num-traits v0.2.9
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.54
[INFO] [stderr]   Downloaded strength_reduce v0.2.2
[INFO] [stderr]   Downloaded anyhow v1.0.19
[INFO] [stderr]   Downloaded web-sys v0.3.31
[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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 96097a1ac09cea4538bbfa2abd2417f5882c1427c5e6a28c72a4ca7d57c9f6ba
[INFO] running `Command { std: "docker" "start" "-a" "96097a1ac09cea4538bbfa2abd2417f5882c1427c5e6a28c72a4ca7d57c9f6ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "96097a1ac09cea4538bbfa2abd2417f5882c1427c5e6a28c72a4ca7d57c9f6ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96097a1ac09cea4538bbfa2abd2417f5882c1427c5e6a28c72a4ca7d57c9f6ba", kill_on_drop: false }`
[INFO] [stdout] 96097a1ac09cea4538bbfa2abd2417f5882c1427c5e6a28c72a4ca7d57c9f6ba
[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=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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 01ab9f8892c8ecc93a0fd741ed2dd7c3b191a47133dfb49ed73c0eef4ae37322
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "01ab9f8892c8ecc93a0fd741ed2dd7c3b191a47133dfb49ed73c0eef4ae37322", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.54
[INFO] [stderr]    Compiling syn v1.0.8
[INFO] [stderr]    Compiling bumpalo v2.6.0
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling anyhow v1.0.19
[INFO] [stderr]    Compiling wasm-bindgen v0.2.54
[INFO] [stderr]    Compiling sourcefile v0.1.4
[INFO] [stderr]     Checking strength_reduce v0.2.2
[INFO] [stderr]     Checking transpose v0.1.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling num-traits v0.2.9
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling weedle v0.10.0
[INFO] [stderr]     Checking rustfft v3.0.0
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.54
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.54
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.54
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.54
[INFO] [stderr]    Compiling web-sys v0.3.31
[INFO] [stderr]     Checking js-sys v0.3.31
[INFO] [stderr]     Checking console_error_panic_hook v0.1.6
[INFO] [stderr]     Checking spectrogram v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:76:35
[INFO] [stdout]     |
[INFO] [stdout] 62  | / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  | |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  | |   
[INFO] [stdout] 65  | |   let on_frame = {
[INFO] [stdout] ...   |
[INFO] [stdout] 76  | |   let canvas: HtmlCanvasElement = window()?
[INFO] [stdout]     | |                                   ^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:76:35
[INFO] [stdout]     |
[INFO] [stdout] 62  | / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  | |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  | |   
[INFO] [stdout] 65  | |   let on_frame = {
[INFO] [stdout] ...   |
[INFO] [stdout] 76  | |   let canvas: HtmlCanvasElement = window()?
[INFO] [stdout]     | |                                   ^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:76:35
[INFO] [stdout]     |
[INFO] [stdout] 62  |  / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  |  |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  |  |   
[INFO] [stdout] 65  |  |   let on_frame = {
[INFO] [stdout] ...    |
[INFO] [stdout] 76  |  |   let canvas: HtmlCanvasElement = window()?
[INFO] [stdout]     |  |___________________________________^
[INFO] [stdout] 77  | ||     .document()?
[INFO] [stdout]     | ||________________^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...    |
[INFO] [stdout] 100 |  |   Ok(())
[INFO] [stdout] 101 |  | }
[INFO] [stdout]     |  |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:76:35
[INFO] [stdout]     |
[INFO] [stdout] 62  |  / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  |  |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  |  |   
[INFO] [stdout] 65  |  |   let on_frame = {
[INFO] [stdout] ...    |
[INFO] [stdout] 76  |  |   let canvas: HtmlCanvasElement = window()?
[INFO] [stdout]     |  |___________________________________^
[INFO] [stdout] 77  | ||     .document()?
[INFO] [stdout]     | ||________________^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...    |
[INFO] [stdout] 100 |  |   Ok(())
[INFO] [stdout] 101 |  | }
[INFO] [stdout]     |  |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:76:35
[INFO] [stdout]     |
[INFO] [stdout] 62  |  / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  |  |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  |  |   
[INFO] [stdout] 65  |  |   let on_frame = {
[INFO] [stdout] ...    |
[INFO] [stdout] 76  |  |   let canvas: HtmlCanvasElement = window()?
[INFO] [stdout]     |  |___________________________________^
[INFO] [stdout] 77  | ||     .document()?
[INFO] [stdout] 78  | ||     .get_element_by_id(&args.canvas_id)?
[INFO] [stdout]     | ||________________________________________^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...    |
[INFO] [stdout] 100 |  |   Ok(())
[INFO] [stdout] 101 |  | }
[INFO] [stdout]     |  |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:76:35
[INFO] [stdout]     |
[INFO] [stdout] 62  |  / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  |  |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  |  |   
[INFO] [stdout] 65  |  |   let on_frame = {
[INFO] [stdout] ...    |
[INFO] [stdout] 76  |  |   let canvas: HtmlCanvasElement = window()?
[INFO] [stdout]     |  |___________________________________^
[INFO] [stdout] 77  | ||     .document()?
[INFO] [stdout] 78  | ||     .get_element_by_id(&args.canvas_id)?
[INFO] [stdout]     | ||________________________________________^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...    |
[INFO] [stdout] 100 |  |   Ok(())
[INFO] [stdout] 101 |  | }
[INFO] [stdout]     |  |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:81:43
[INFO] [stdout]     |
[INFO] [stdout] 62  |  / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  |  |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  |  |   
[INFO] [stdout] 65  |  |   let on_frame = {
[INFO] [stdout] ...    |
[INFO] [stdout] 81  |  |   let context: CanvasRenderingContext2d = canvas
[INFO] [stdout]     |  |___________________________________________^
[INFO] [stdout] 82  | ||     .get_context("2d")??
[INFO] [stdout]     | ||________________________^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...    |
[INFO] [stdout] 100 |  |   Ok(())
[INFO] [stdout] 101 |  | }
[INFO] [stdout]     |  |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:89:3
[INFO] [stdout]     |
[INFO] [stdout] 62  | / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  | |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  | |   
[INFO] [stdout] 65  | |   let on_frame = {
[INFO] [stdout] ...   |
[INFO] [stdout] 89  | |   window()?.request_animation_frame(
[INFO] [stdout]     | |   ^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:90:5
[INFO] [stdout]     |
[INFO] [stdout] 62  | / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  | |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  | |   
[INFO] [stdout] 65  | |   let on_frame = {
[INFO] [stdout] ...   |
[INFO] [stdout] 90  | |     on_frame.as_ref().dyn_ref()?
[INFO] [stdout]     | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:106:6
[INFO] [stdout]     |
[INFO] [stdout] 103 | / fn on_frame(renderer: &mut Renderer_) -> Result<(),Error> {
[INFO] [stdout] 104 | |   
[INFO] [stdout] 105 | |   let (width,height) = resize(
[INFO] [stdout] 106 | |     &renderer.context.canvas()?,
[INFO] [stdout]     | |      ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:81:43
[INFO] [stdout]     |
[INFO] [stdout] 62  |  / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  |  |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  |  |   
[INFO] [stdout] 65  |  |   let on_frame = {
[INFO] [stdout] ...    |
[INFO] [stdout] 81  |  |   let context: CanvasRenderingContext2d = canvas
[INFO] [stdout]     |  |___________________________________________^
[INFO] [stdout] 82  | ||     .get_context("2d")??
[INFO] [stdout]     | ||________________________^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...    |
[INFO] [stdout] 100 |  |   Ok(())
[INFO] [stdout] 101 |  | }
[INFO] [stdout]     |  |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:89:3
[INFO] [stdout]     |
[INFO] [stdout] 62  | / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  | |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  | |   
[INFO] [stdout] 65  | |   let on_frame = {
[INFO] [stdout] ...   |
[INFO] [stdout] 89  | |   window()?.request_animation_frame(
[INFO] [stdout]     | |   ^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:90:5
[INFO] [stdout]     |
[INFO] [stdout] 62  | / pub fn start_rendering(args: Renderer) -> Result<(),Error> {
[INFO] [stdout] 63  | |   let renderer = Rc::new(RefCell::new(None));
[INFO] [stdout] 64  | |   
[INFO] [stdout] 65  | |   let on_frame = {
[INFO] [stdout] ...   |
[INFO] [stdout] 90  | |     on_frame.as_ref().dyn_ref()?
[INFO] [stdout]     | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:120:6
[INFO] [stdout]     |
[INFO] [stdout] 103 | / fn on_frame(renderer: &mut Renderer_) -> Result<(),Error> {
[INFO] [stdout] 104 | |   
[INFO] [stdout] 105 | |   let (width,height) = resize(
[INFO] [stdout] 106 | |     &renderer.context.canvas()?,
[INFO] [stdout] ...   |
[INFO] [stdout] 120 | |     &renderer.context.canvas()?, 0.0, -1.0
[INFO] [stdout]     | |      ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:125:3
[INFO] [stdout]     |
[INFO] [stdout] 103 | / fn on_frame(renderer: &mut Renderer_) -> Result<(),Error> {
[INFO] [stdout] 104 | |   
[INFO] [stdout] 105 | |   let (width,height) = resize(
[INFO] [stdout] 106 | |     &renderer.context.canvas()?,
[INFO] [stdout] ...   |
[INFO] [stdout] 125 | |   window()?.request_animation_frame(
[INFO] [stdout]     | |   ^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:106:6
[INFO] [stdout]     |
[INFO] [stdout] 103 | / fn on_frame(renderer: &mut Renderer_) -> Result<(),Error> {
[INFO] [stdout] 104 | |   
[INFO] [stdout] 105 | |   let (width,height) = resize(
[INFO] [stdout] 106 | |     &renderer.context.canvas()?,
[INFO] [stdout]     | |      ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:120:6
[INFO] [stdout]     |
[INFO] [stdout] 103 | / fn on_frame(renderer: &mut Renderer_) -> Result<(),Error> {
[INFO] [stdout] 104 | |   
[INFO] [stdout] 105 | |   let (width,height) = resize(
[INFO] [stdout] 106 | |     &renderer.context.canvas()?,
[INFO] [stdout] ...   |
[INFO] [stdout] 120 | |     &renderer.context.canvas()?, 0.0, -1.0
[INFO] [stdout]     | |      ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:125:3
[INFO] [stdout]     |
[INFO] [stdout] 103 | / fn on_frame(renderer: &mut Renderer_) -> Result<(),Error> {
[INFO] [stdout] 104 | |   
[INFO] [stdout] 105 | |   let (width,height) = resize(
[INFO] [stdout] 106 | |     &renderer.context.canvas()?,
[INFO] [stdout] ...   |
[INFO] [stdout] 125 | |   window()?.request_animation_frame(
[INFO] [stdout]     | |   ^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:126:5
[INFO] [stdout]     |
[INFO] [stdout] 103 | / fn on_frame(renderer: &mut Renderer_) -> Result<(),Error> {
[INFO] [stdout] 104 | |   
[INFO] [stdout] 105 | |   let (width,height) = resize(
[INFO] [stdout] 106 | |     &renderer.context.canvas()?,
[INFO] [stdout] ...   |
[INFO] [stdout] 126 | |     renderer.on_frame.as_ref().dyn_ref()?
[INFO] [stdout]     | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/canvas.rs:126:5
[INFO] [stdout]     |
[INFO] [stdout] 103 | / fn on_frame(renderer: &mut Renderer_) -> Result<(),Error> {
[INFO] [stdout] 104 | |   
[INFO] [stdout] 105 | |   let (width,height) = resize(
[INFO] [stdout] 106 | |     &renderer.context.canvas()?,
[INFO] [stdout] ...   |
[INFO] [stdout] 126 | |     renderer.on_frame.as_ref().dyn_ref()?
[INFO] [stdout]     | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/audio.rs:101:37
[INFO] [stdout]     |
[INFO] [stdout] 64  | / pub fn start_processing(args: Processor) -> Result<(),Error> {
[INFO] [stdout] 65  | |   let processor = Rc::new(RefCell::new(None));
[INFO] [stdout] 66  | |   
[INFO] [stdout] 67  | |   let on_source = {
[INFO] [stdout] ...   |
[INFO] [stdout] 101 | |   proc_node.set_onaudioprocess(Some(on_proc.as_ref().dyn_ref()?));
[INFO] [stdout]     | |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |   Ok(())
[INFO] [stdout] 125 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/audio.rs:101:37
[INFO] [stdout]     |
[INFO] [stdout] 64  | / pub fn start_processing(args: Processor) -> Result<(),Error> {
[INFO] [stdout] 65  | |   let processor = Rc::new(RefCell::new(None));
[INFO] [stdout] 66  | |   
[INFO] [stdout] 67  | |   let on_source = {
[INFO] [stdout] ...   |
[INFO] [stdout] 101 | |   proc_node.set_onaudioprocess(Some(on_proc.as_ref().dyn_ref()?));
[INFO] [stdout]     | |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |   Ok(())
[INFO] [stdout] 125 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/audio.rs:104:3
[INFO] [stdout]     |
[INFO] [stdout] 64  | / pub fn start_processing(args: Processor) -> Result<(),Error> {
[INFO] [stdout] 65  | |   let processor = Rc::new(RefCell::new(None));
[INFO] [stdout] 66  | |   
[INFO] [stdout] 67  | |   let on_source = {
[INFO] [stdout] ...   |
[INFO] [stdout] 104 | |   window()?
[INFO] [stdout]     | |   ^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |   Ok(())
[INFO] [stdout] 125 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/audio.rs:104:3
[INFO] [stdout]     |
[INFO] [stdout] 64  | / pub fn start_processing(args: Processor) -> Result<(),Error> {
[INFO] [stdout] 65  | |   let processor = Rc::new(RefCell::new(None));
[INFO] [stdout] 66  | |   
[INFO] [stdout] 67  | |   let on_source = {
[INFO] [stdout] ...   |
[INFO] [stdout] 104 | |   window()?
[INFO] [stdout]     | |   ^^^^^^^^^ cannot use the `?` operator in a function that returns `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |   Ok(())
[INFO] [stdout] 125 | | }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<!>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 12 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `spectrogram`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 12 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "01ab9f8892c8ecc93a0fd741ed2dd7c3b191a47133dfb49ed73c0eef4ae37322", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01ab9f8892c8ecc93a0fd741ed2dd7c3b191a47133dfb49ed73c0eef4ae37322", kill_on_drop: false }`
[INFO] [stdout] 01ab9f8892c8ecc93a0fd741ed2dd7c3b191a47133dfb49ed73c0eef4ae37322