annot infer type of the type parameter S declared on the function layer

[TheGP]

error[E0282]: type annotations needed
   --> src/main.rs:159:22
    |
159 |     let console_layer = tracing_subscriber::fmt::layer()
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `S` declared on the function `layer`
    |
help: consider specifying the generic argument
    |
159 |     let console_layer = tracing_subscriber::fmt::layer::<S>()

let (non_blocking_console, console_guard) = tracing_appender::non_blocking(std::io::stdout());
let console_layer = tracing_subscriber::fmt::layer()
        .with_writer(non_blocking_console)
        .with_ansi(true)
        .with_target(false)
        .with_span_events(FmtSpan::CLOSE)
        .with_filter(filter::LevelFilter::INFO);
``

[kaffarell]

Check this section: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/layer/index.html#composing-layers. Either you specify the subscriber or you add the layer to a subscriber, f.e. to the registry.