Crate bauer 

A derive macro for automatically generating the builder pattern

use bauer::Builder;

#[derive(Builder)]
pub struct Foo {
    bar: u32,
}

let foo: Foo = Foo::builder()
    .bar(42)
    .build()
    .unwrap();

assert_eq!(foo, Foo { bar: 42, });

Derive Macros

Builder

The main macro.