syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"super::sig_types::walk_types(self.tcx,"}]}
source_snippet:             super::sig_types::walk_types(self.tcx, define, self);
context_before:             let n = self.opaques.len();
context_after:             if n == self.opaques.len() {