{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"//"}]}
// * Pat(P<ast::Pat>)                       -> token_tree_to_pat
// * Expr(P<ast::Expr>)                     -> token_tree_to_expr
// * Ty(P<ast::Ty>)                         -> token_tree_to_ty