{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"///"}]}
    /// (this is wrapping arithmetic using the type of the niche field, cf. the
    /// the tag is set to `(i - niche_variants.start).wrapping_add(niche_start)`
    /// [`tag_for_variant`](../rustc_const_eval/interpret/struct.InterpCx.html#method.tag_for_variant)