[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#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimjrd%2Fwasm-spectrogram" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/timjrd/wasm-spectrogram on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "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-8/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.54
[INFO] [stderr]   Downloaded rustfft v3.0.0
[INFO] [stderr]   Downloaded js-sys v0.3.31
[INFO] [stderr]   Downloaded num-traits v0.2.9
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.54
[INFO] [stderr]   Downloaded wasm-bindgen-webidl v0.2.54
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.54
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.54
[INFO] [stderr]   Downloaded anyhow v1.0.19
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.54
[INFO] [stderr]   Downloaded web-sys v0.3.31
[INFO] [stderr]   Downloaded strength_reduce v0.2.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cb90304dfe99db95ffbee7277b9142fa4c48fb2b78bd11882451f61c1971ffa1
[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" "cb90304dfe99db95ffbee7277b9142fa4c48fb2b78bd11882451f61c1971ffa1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cb90304dfe99db95ffbee7277b9142fa4c48fb2b78bd11882451f61c1971ffa1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb90304dfe99db95ffbee7277b9142fa4c48fb2b78bd11882451f61c1971ffa1", kill_on_drop: false }`
[INFO] [stdout] cb90304dfe99db95ffbee7277b9142fa4c48fb2b78bd11882451f61c1971ffa1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 86a39dcf861456125b643cc6a526d04d83ba9f1797f806091b5e470cbda59aa2
[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" "86a39dcf861456125b643cc6a526d04d83ba9f1797f806091b5e470cbda59aa2", kill_on_drop: false }`
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.54
[INFO] [stderr]    Compiling syn v1.0.8
[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]     Checking strength_reduce v0.2.2
[INFO] [stderr]     Checking transpose v0.1.0
[INFO] [stderr]    Compiling num-traits v0.2.9
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling nom v4.2.3
[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[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/error.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::option::NoneError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/error.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::option::NoneError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:76:43
[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] 76  | |   let canvas: HtmlCanvasElement = window()?
[INFO] [stdout]     | |                                           ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:77:16
[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] 77  | |     .document()?
[INFO] [stdout]     | |                ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:78:40
[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] 78  | |     .get_element_by_id(&args.canvas_id)?
[INFO] [stdout]     | |                                        ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:82:24
[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] 82  | |     .get_context("2d")??
[INFO] [stdout]     | |                        ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:89:11
[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]     | |           ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:90:32
[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]     | |                                ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:106:31
[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]     | |                               ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:120:31
[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]     | |                               ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:125:11
[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]     | |           ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:76:43
[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] 76  | |   let canvas: HtmlCanvasElement = window()?
[INFO] [stdout]     | |                                           ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:126:41
[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]     | |                                         ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/audio.rs:101:63
[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]     | |                                                               ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |   Ok(())
[INFO] [stdout] 125 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/audio.rs:104:11
[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]     | |           ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |   Ok(())
[INFO] [stdout] 125 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:77:16
[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] 77  | |     .document()?
[INFO] [stdout]     | |                ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:78:40
[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] 78  | |     .get_element_by_id(&args.canvas_id)?
[INFO] [stdout]     | |                                        ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:82:24
[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] 82  | |     .get_context("2d")??
[INFO] [stdout]     | |                        ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:89:11
[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]     | |           ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:90:32
[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]     | |                                ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 100 | |   Ok(())
[INFO] [stdout] 101 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:106:31
[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]     | |                               ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:120:31
[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]     | |                               ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:125:11
[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]     | |           ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/canvas.rs:126:41
[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]     | |                                         ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 129 | |   Ok(())
[INFO] [stdout] 130 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 13 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0432.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/audio.rs:101:63
[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]     | |                                                               ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |   Ok(())
[INFO] [stdout] 125 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` 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 on `Result`s, not `Option`s, in a function that returns `Result`
[INFO] [stdout]    --> src/audio.rs:104:11
[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]     | |           ^ use `.ok_or(...)?` to provide an error compatible with `Result<(), error::Error>`
[INFO] [stdout] ...   |
[INFO] [stdout] 124 | |   Ok(())
[INFO] [stdout] 125 | | }
[INFO] [stdout]     | |_- this function returns a `Result`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Option<Infallible>>` is not implemented for `Result<(), error::Error>`
[INFO] [stdout]     = note: required by `from_residual`
[INFO] [stdout] 
[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 13 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0432.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "86a39dcf861456125b643cc6a526d04d83ba9f1797f806091b5e470cbda59aa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86a39dcf861456125b643cc6a526d04d83ba9f1797f806091b5e470cbda59aa2", kill_on_drop: false }`
[INFO] [stdout] 86a39dcf861456125b643cc6a526d04d83ba9f1797f806091b5e470cbda59aa2