syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let guar = self.dcx().delayed_bug("overflow expanding free alias type");
context_before:             if !limit.value_within_limit(depth) {
context_after:                 return Ty::new_error(self, guar);