nitnelave 89d0ca845d attributes: support custom levels for ret and err (#2335)
This branch adds the ability to override the level of the events
generated by the `ret` and `err` arguments to `#[instrument]`. An
overridden level can be specified with:

```rust

```
```rust

```
and so on.

This syntax is fully backwards compatible with existing uses of the
attribute.

In addition, some refactoring was done to how levels are parsed and how
the tokens for a specified level is generated.

Fixes #2330
; Conflicts:
;	tracing-attributes/src/lib.rs
2023-04-21 16:59:51 -07:00
..