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macros: Handle constant field names #2617

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merged 8 commits into from
Sep 5, 2023
Merged

macros: Handle constant field names #2617

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48495eb
macros: Handle constant field names
Jun 15, 2023
a3cc393
Add documentation
Jun 15, 2023
38a7232
doc: fix typo
wyfo Jun 22, 2023
8f3d935
macros: refine constant field names tests
Jun 22, 2023
a680b4c
expand doc comment
hawkw Sep 5, 2023
cb5b499
Merge branch 'master' into constant_field_name
hawkw Sep 5, 2023
5d65b45
rename callsite in new macro cases from #2699
hawkw Sep 5, 2023
5092c87
rustfmt
hawkw Sep 5, 2023
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13 changes: 13 additions & 0 deletions tracing/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -319,6 +319,19 @@
//! # }
//!```
//!
//! Constant expressions can also be used as field names. Constants
//! must be enclosed in curly braces (`{}`) to indicate that the *value*
//! of the constant is to be used as the field name, rather than the
//! constant's name. For example:
//! ```
//! # use tracing::{span, Level};
//! # fn main() {
//! const RESOURCE_NAME: &str = "foo";
//! // this span will have the field `foo = "some_id"`
//! span!(Level::TRACE, "get", { RESOURCE_NAME } = "some_id");
//! # }
//!```
//!
//! The `?` sigil is shorthand that specifies a field should be recorded using
//! its [`fmt::Debug`] implementation:
//! ```
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