{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"//!"}]}
//!         (<ident of C1>, <span of C1>, Named(vec![(<ident of x>, <span of x>)])),
//!         (<ident of C0>, <span of C0>, Unnamed(vec![<span of i32>])),
//!     ],