syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"self.tcx.dcx().create_err(UnionPattern"}]}
source_snippet:                         self.tcx.dcx().create_err(UnionPattern { span: self.span })
context_before:                         assert!(def.is_union());
context_after:                     }