syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"hir::ExprKind::Err(_)"}]}
source_snippet:             hir::ExprKind::Err(_) => unreachable!("cannot lower a `hir::ExprKind::Err` to THIR"),
context_before:             hir::ExprKind::Yield(v, _) => ExprKind::Yield { value: self.mirror_expr(v) },
context_after:         };