{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"ty::Tuple(args)"}]}
            ty::Tuple(args) => Ok(args.len()),
        match self.cx.structurally_resolve_type(span, ty).kind() {
            _ => Err(self.cx.report_bug(span, "tuple pattern not applied to a tuple")),