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