buildstructor 0.6.0

Macro to derive a builder from a constructor function.
Documentation 
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use buildstructor::buildstructor;

use std::error::Error;

pub struct Fallible {
    simple: usize,
}

#[buildstructor]
impl Fallible {
    #[builder]
    fn new(simple: usize) -> Result<Fallible, Box<dyn Error>> {
        Ok(Self { simple })
    }
}

fn main() {
    let fallible = Fallible::builder().simple(2).build().unwrap();
    assert_eq!(fallible.simple, 2);
}