{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"left_before:"}]}
                    left_before: (l_ty_refs != 0).then_some(l_span.shrink_to_lo()),
                    paren_right: if r_ty_refs != 0 { ")" } else { "" },
                    left_after: l_span.shrink_to_hi(),