Macro async_closure

macro_rules! async_closure {
    ( [$( $x:expr );*] $y:expr ) => { ... };
}

Generates an asynchronous closure that rebinding the provided expressions and evaluates a given expression within the async context. This macro takes a list of expressions to be rebound using a helper rebinding macro, then returns an async move block that evaluates the specified expression while capturing the rebound variables.