{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"///"}]}
    /// Note that for this encoding, the discriminant and variant index of each variant coincide!
    /// Niche (values invalid for a type) encoding the discriminant.
    /// This invariant is codified as part of [`layout_sanity_check`](../rustc_ty_utils/layout/invariant/fn.layout_sanity_check.html).