{"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"///"}]}
/// e.g. `let err = struct_err(msg).with_code(code);`, or emitting a new
/// prefix. This can be used in a chained fashion when making a new diagnostic,
/// diagnostic, e.g. `struct_err(msg).with_code(code).emit();`.