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Traces to Chrome's [trace_event format](https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview)
## Example ##
Cargo.toml:
```toml
rs_tracing = { version = "1.0", features = ["rs_tracing"] }
```
main.rs:
```Rust
fn main() {
open_trace_file!(".").unwrap();
{
trace_scoped!("complete","custom data":"main");
trace_expr!("trace_expr", println!("trace_expr"));
trace_begin!("duration");
println!("trace_duration");
trace_end!("duration");
}
close_trace_file!();
}
```
also possible to add custom data to all the macros formated like
the [serde_json::json!](https://docs.serde.rs/serde_json/macro.json.html) macro e.g.
trace_scoped!("complete","custom":230,"more":"data");
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