facet 0.44.4

Reflection for Rust: introspect types at compile time with metadata for serialization, pretty-printing, CLIs, and more
Documentation 
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use facet::Facet;
use std::sync::Arc;

#[derive(Facet)]
struct Recursive {
    #[facet(recursive_type)]
    next: Option<Arc<Recursive>>,
    #[facet(recursive_type)]
    others: Vec<Recursive>,
}

#[derive(Debug)]
struct ShapeLike {
    next: Option<fn() -> &'static ShapeLike>,
}

impl FacetLike for () {
    const SHAPE_LIKE: &'static ShapeLike = &const {
        ShapeLike {
            next: Some(|| Self::SHAPE_LIKE),
        }
    };
}

impl<T: FacetLike> FacetLike for Vec<T> {
    const SHAPE_LIKE: &'static ShapeLike = &ShapeLike {
        next: Some(|| T::SHAPE_LIKE),
    };
}

trait FacetLike {
    const SHAPE_LIKE: &'static ShapeLike;
}

#[test]
fn cyclic_shape() {
    assert!(<()>::SHAPE_LIKE.next.is_some());
}