facet-core 0.46.0

Core reflection traits and types for the facet ecosystem - provides the Facet trait, Shape metadata, and type-erased pointers
Documentation 
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use crate::{Facet, Opaque, OpaqueBorrow, Shape, VarianceDesc};

// Opaque<T> is a lifetime boundary; require 'static to prevent lifetime laundering
// through reflection. See issue #1563 for details.
unsafe impl<'facet, T: 'static> Facet<'facet> for Opaque<T> {
    const SHAPE: &'static Shape = &const {
        Shape::builder_for_sized::<Opaque<T>>("Opaque")
            .variance(VarianceDesc::INVARIANT)
            .build()
    };
}

// OpaqueBorrow<'facet, T> is used by derive-generated field-level `#[facet(opaque)]`
// wrappers so borrowed fields can stay tied to the active Facet lifetime.
unsafe impl<'facet, T: 'facet> Facet<'facet> for OpaqueBorrow<'facet, T> {
    const SHAPE: &'static Shape = &const {
        // Reuse Opaque<T>'s shape identity for compatibility with APIs/tests that
        // set field-level opaque values via Opaque<T>.
        Shape::builder_for_sized::<Opaque<T>>("Opaque")
            .variance(VarianceDesc::INVARIANT)
            .build()
    };
}