{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"hir::ExprKind::Err(self.dcx().emit_err(AsyncCoroutinesNotSupported"}]}
                    hir::ExprKind::Err(self.dcx().emit_err(AsyncCoroutinesNotSupported { span })),
                    yielded.span,
                );