builder-pattern 0.4.2

A derivable macro for declaring a builder pattern.
Documentation 
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use builder_pattern::Builder;

#[derive(Builder)]
pub struct Whatever {
    #[default(|i| -i)]
    pub bar: fn(i8) -> i8,
}

fn main() {
    let a = Whatever::new().build();
    assert_eq!((a.bar)(-1), 1);
}