Cargo Features
tracing-wasm has no features set by default.
[dependencies]
tracing-wasm = { version = "0.2.1", features = ["mark-with-rayon-thread-index"] }- mark-with-rayon-thread-index = rayon
Features from optional dependencies
In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.