syntax_data: {"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let ty = ensure_sufficient_stack(|| {
context_before:         self.depth += 1;
context_after:             self.tcx.type_of(alias.def_id).instantiate(self.tcx, alias.args).fold_with(self)