macro_rules! test_with_all_runtimes {
    ( $fn:expr ) => { ... };
Available on (crate features native-tls or rustls) and (crate features tokio or async-std) only.
Expand description

Run a test closure, passing as argument every supported runtime.

(This is a macro so that it can repeat the closure as multiple separate expressions, so it can take on two different types, if needed.)