{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
    let ty::Adt(adt_def, _) = struct_type.kind() else {
    let struct_type = unique_type_id.expect_ty();
        bug!("build_struct_type_di_node() called with non-struct-type: {:?}", struct_type);