The with macro

This is a macro that takes an object and lets you call methods on that object without naming it. The first argument is an expression that will be assigned to a variable in let binding. To make that binding mutable, prepend mut to the expression. Calling a function that starts with a . will be converted into a method call using this variable.

The supported forms are: - .method(args..) - let pat = .method(args..); - var = .method(args..);

Anything else will be evaluated unmodified as an expression.

Usage

```Rust use with_macro::with;

let vec = with! { mut Vec::new() => .push(1) .push(42) .push(-13) let l = .len(); assert_eq!(l, 3); };

assert_eq!(vec, [1, 42, -13]); ```