syntax_data: {"ast_node_type":"variable","tokens":[{"end":41,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let PartialEqImplStatus {
context_before:                 debug!("adt_def {:?} has !type_marked_structural for cv.ty: {:?}", adt_def, ty);
context_after:                     is_derived, structural_partial_eq, non_blanket_impl, ..