syntax_data: {"ast_node_type":"import","tokens":[{"end":97,"kind":"keyword","start":0,"text":".struct_span_err(self.span,"}]}
source_snippet:                     .struct_span_err(self.span, "non-defining opaque type use in defining scope")
context_before:                     .dcx()
context_after:                     .with_span_label(