syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"self.tcx.dcx().span_err(span,"}]}
source_snippet:                 self.tcx.dcx().span_err(span, "item does not contain any opaque types");
context_before:             if n == self.opaques.len() {
context_after:             }