syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"self.tcx.dcx().has_errors().is_some(),"}]}
source_snippet:                                     self.tcx.dcx().has_errors().is_some(),
context_before:                                 assert!(
context_after:                                     "union fields that need dropping should be impossible: {assigned_ty}"