{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"//"}]}
// * Ty(P<ast::Ty>)                         -> token_tree_to_ty
// * Pat(P<ast::Pat>)                       -> token_tree_to_pat
// * Stmts(SmallVec<[ast::Stmt; 1]>)        -> token_tree_to_stmts