Macro make_request_spanner 

macro_rules! make_request_spanner {
    ($fn:ident($name:literal, $level:expr)) => { ... };
}

Declares fn function compatible with MakeSpan using provided parameters

Usage

use tower_http_tracing::make_request_spanner;

make_request_spanner!(make_my_request_span("my_request", tracing::Level::INFO));

let span = make_my_request_span();
span.record("http.url", "I can override span field");