validatron 0.2.0

A data structure validation library designed for user input
Documentation 
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use validatron::{Error, Location, Validate};

#[test]
fn test_custom_field_validator() {
    fn is_u64_valid(x: &u64) -> Result<(), Error> {
        if *x <= 1 {
            Err(Error::new("is greater than 1"))
        } else {
            Ok(())
        }
    }

    #[derive(Validate)]
    struct Foo {
        #[validatron(function = "is_u64_valid")]
        a: u64,
    }

    assert!(Foo { a: 72 }.validate().is_ok());
    assert!(Foo { a: 0 }.validate().is_err());
}

#[test]
fn uses_existing_function() {
    #[derive(Validate)]
    struct Foo(#[validatron(predicate = "Option::is_some")] Option<i32>);

    assert!(Foo(Some(32)).validate().is_ok());

    let x = Foo(None);
    let e = x.validate().unwrap_err();

    println!("{:#?}", e);
    assert_eq!(
        e,
        Error::Structured(
            vec![(
                Location::Index(0),
                Error::Unstructured(vec!["Predicate \"Option::is_some\" failed".into()])
            )]
            .into_iter()
            .collect()
        )
    )
}