{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
//     produce diagnostics, and turn the whole thing into a `FormatArgs` AST node.
//  2. Second, `make_format_args` will parse the template, the format options, resolve argument references,
//  3. Much later, in AST lowering (rustc_ast_lowering), that `FormatArgs` structure will be turned