syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"self.expanded_cache.insert((def_id,"}]}
source_snippet:                     self.expanded_cache.insert((def_id, args), expanded_ty);
context_before:                     let expanded_ty = self.fold_ty(concrete_ty);
context_after:                     expanded_ty