usecrate::sink::{Guard, Sink};/// [`Sink`] that pipes spans into the browser's User Timing API
/// (`performance.mark` / `performance.measure`).
////// Open DevTools → Performance, record, and span boundaries appear
/// as a flame chart alongside the JS timeline.
pubstructBrowserSink;implSink forBrowserSink{fninstall(self)-> Guard{tracing_wasm::set_as_global_default();Guard::new(())}}