{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
                    // HACK: this could be a fake pattern corresponding to a deref inserted by match
                    // Deref patterns on boxes don't borrow, so we ignore them here.
                    // ergonomics, in which case `pat.hir_id` will be the id of the subpattern.