{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"TagEncoding::Niche"}]}
                TagEncoding::Niche {
            rustc_abi::TagEncoding::Niche { untagged_variant, niche_variants, niche_start } => {
                    untagged_variant: untagged_variant.stable(tables, cx),