Visits typed values. An instance of `Visit` ("a visitor") represents the logic necessary to record field values of various types. When an implementor

this function "remembers" the types of the subscriber so that we can downcast to something aware of them without knowing those types at the callsite.

A layer that holds a string. Used to test that pointers returned by downcasting are actually valid.

Simulates a subscriber that records span data.

this function "remembers" the types of the subscriber and the formatter, so that we can downcast to something aware of them without knowing those type

Combines two [`Filter`]s so that spans and events are enabled if and only if both* filters return `true`. This type is typically returned by the [`Fi

Subscriber toggling example.

Trait implemented to allow a type to be used as a field key. <pre class="ignore" style="white-space:normal;font:inherit;"> <strong>Note</strong>: Alt

Trait implemented by types which have a span `Id`.

Trait implemented for `tracing` types that can be converted to a `log` equivalent.

Trait implemented for `log` types that can be converted to a `tracing` equivalent.

The specific async code pattern that was detected

A visitor struct that replace an async block by its patched version

A writer that erases the specific [`io::Write`] and [`MakeWriter`] types being used. This is useful in cases where the concrete type of the writer ca

Utilities for configuring the `env_logger` crate to emit `tracing` events. Extension trait to configure an `env_logger::Builder` to emit traces.

Trait implemented by callsites. These functions are only intended to be called by the callsite registry, which correctly handles determining the comm

A guard that tracks how many [`Registry`]-backed `Layer`s have processed an `on_close` event. This is needed to enable a [`Registry`]-backed Layer to