tracing-attributes 0.1.24

This release of tracing-attributes adds support for passing an optional
level to the err and ret arguments to #[instrument], allowing the level
of the generated return-value event to be overridden. For example,

#[instrument(err(level = "info"))]
fn my_great_function() -> Result<(), &'static str> {
    // ...
}

will emit an INFO-level event if the function returns an Err.

In addition, this release updates the syn dependency to v2.x.x.

Added

• level argument to err and ret to override the level of the generated
  return value event (#2335)
• Improved compiler error message when #[instrument] is added to a const fn
  (#2418)

Changed

• Updated syn dependency to 2.0 (#2516)

Fixed

• Fix clippy::unreachable warnings in #[instrument]-generated code (#2356)
• Removed unused "visit" feature flag from syn dependency (#2530)

Documented

• Documented default level for err (#2433)
• Improved documentation for levels in #[instrument] (#2350)

Thanks to @nitnelave, @jsgf, @Abhicodes-crypto, @LukeMathWalker, @andrewpollack,
@quad, @klensy, @davidpdrsn, and @dbidwell94 for contributign to this release!